CN104311704A - Membrane filter technology for exacting semi fibers by using viscose fiber pressed alkali liquor as raw materials - Google Patents
Membrane filter technology for exacting semi fibers by using viscose fiber pressed alkali liquor as raw materials Download PDFInfo
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- CN104311704A CN104311704A CN201410622129.6A CN201410622129A CN104311704A CN 104311704 A CN104311704 A CN 104311704A CN 201410622129 A CN201410622129 A CN 201410622129A CN 104311704 A CN104311704 A CN 104311704A
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- membrane
- nanofiltration membrane
- viscose fiber
- raw material
- diffusion dialysis
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- 239000012528 membrane Substances 0.000 title claims abstract description 183
- 239000000835 fiber Substances 0.000 title claims abstract description 64
- 239000003513 alkali Substances 0.000 title claims abstract description 53
- 229920000297 Rayon Polymers 0.000 title claims abstract description 42
- 239000002994 raw material Substances 0.000 title claims abstract description 28
- 238000005516 engineering process Methods 0.000 title abstract description 7
- 238000001914 filtration Methods 0.000 claims abstract description 101
- 238000000502 dialysis Methods 0.000 claims abstract description 79
- 238000009792 diffusion process Methods 0.000 claims abstract description 79
- 239000012535 impurity Substances 0.000 claims abstract description 25
- 239000002253 acid Substances 0.000 claims abstract description 22
- 239000000463 material Substances 0.000 claims abstract description 8
- 238000001728 nano-filtration Methods 0.000 claims description 134
- 239000007788 liquid Substances 0.000 claims description 76
- 238000000034 method Methods 0.000 claims description 55
- VEXZGXHMUGYJMC-UHFFFAOYSA-N Hydrochloric acid Chemical compound Cl VEXZGXHMUGYJMC-UHFFFAOYSA-N 0.000 claims description 50
- 238000006386 neutralization reaction Methods 0.000 claims description 31
- 125000002091 cationic group Chemical group 0.000 claims description 29
- 238000005374 membrane filtration Methods 0.000 claims description 23
- 238000000605 extraction Methods 0.000 claims description 19
- 238000010612 desalination reaction Methods 0.000 claims description 16
- 238000000108 ultra-filtration Methods 0.000 claims description 16
- 239000012466 permeate Substances 0.000 claims description 12
- 239000000284 extract Substances 0.000 claims description 11
- 239000012141 concentrate Substances 0.000 claims description 7
- 238000004519 manufacturing process Methods 0.000 abstract description 6
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 abstract description 2
- 238000005341 cation exchange Methods 0.000 abstract 1
- 239000002245 particle Substances 0.000 abstract 1
- 238000011045 prefiltration Methods 0.000 abstract 1
- 239000000243 solution Substances 0.000 description 59
- HEMHJVSKTPXQMS-UHFFFAOYSA-M sodium hydroxide Inorganic materials [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 description 48
- 229920002488 Hemicellulose Polymers 0.000 description 26
- 150000003839 salts Chemical class 0.000 description 9
- 239000002699 waste material Substances 0.000 description 7
- 238000007380 fibre production Methods 0.000 description 5
- 239000007787 solid Substances 0.000 description 5
- DPDMMXDBJGCCQC-UHFFFAOYSA-N [Na].[Cl] Chemical compound [Na].[Cl] DPDMMXDBJGCCQC-UHFFFAOYSA-N 0.000 description 4
- 229920002678 cellulose Polymers 0.000 description 4
- 235000010980 cellulose Nutrition 0.000 description 4
- 229920003043 Cellulose fiber Polymers 0.000 description 3
- 239000001913 cellulose Substances 0.000 description 3
- 239000012530 fluid Substances 0.000 description 3
- 239000004627 regenerated cellulose Substances 0.000 description 3
- 238000000926 separation method Methods 0.000 description 3
- VEXZGXHMUGYJMC-UHFFFAOYSA-M Chloride anion Chemical compound [Cl-] VEXZGXHMUGYJMC-UHFFFAOYSA-M 0.000 description 2
- 229920001131 Pulp (paper) Polymers 0.000 description 2
- TVXBFESIOXBWNM-UHFFFAOYSA-N Xylitol Natural products OCCC(O)C(O)C(O)CCO TVXBFESIOXBWNM-UHFFFAOYSA-N 0.000 description 2
- 239000003795 chemical substances by application Substances 0.000 description 2
- 229910017053 inorganic salt Inorganic materials 0.000 description 2
- HEBKCHPVOIAQTA-UHFFFAOYSA-N meso ribitol Natural products OCC(O)C(O)C(O)CO HEBKCHPVOIAQTA-UHFFFAOYSA-N 0.000 description 2
- 238000011112 process operation Methods 0.000 description 2
- 239000000047 product Substances 0.000 description 2
- 125000001453 quaternary ammonium group Chemical group 0.000 description 2
- 235000013311 vegetables Nutrition 0.000 description 2
- 239000000811 xylitol Substances 0.000 description 2
- HEBKCHPVOIAQTA-SCDXWVJYSA-N xylitol Chemical compound OC[C@H](O)[C@@H](O)[C@H](O)CO HEBKCHPVOIAQTA-SCDXWVJYSA-N 0.000 description 2
- 229960002675 xylitol Drugs 0.000 description 2
- 235000010447 xylitol Nutrition 0.000 description 2
- 239000002028 Biomass Substances 0.000 description 1
- 229920000742 Cotton Polymers 0.000 description 1
- 235000014676 Phragmites communis Nutrition 0.000 description 1
- 150000007513 acids Chemical class 0.000 description 1
- 230000002411 adverse Effects 0.000 description 1
- 239000012670 alkaline solution Substances 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000000903 blocking effect Effects 0.000 description 1
- 239000006227 byproduct Substances 0.000 description 1
- 238000001354 calcination Methods 0.000 description 1
- 238000005119 centrifugation Methods 0.000 description 1
- 239000000919 ceramic Substances 0.000 description 1
- 239000012295 chemical reaction liquid Substances 0.000 description 1
- 230000000295 complement effect Effects 0.000 description 1
- HEBKCHPVOIAQTA-NGQZWQHPSA-N d-xylitol Chemical compound OC[C@H](O)C(O)[C@H](O)CO HEBKCHPVOIAQTA-NGQZWQHPSA-N 0.000 description 1
- 238000010790 dilution Methods 0.000 description 1
- 239000012895 dilution Substances 0.000 description 1
- 238000007598 dipping method Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000003792 electrolyte Substances 0.000 description 1
- 239000012467 final product Substances 0.000 description 1
- 239000003292 glue Substances 0.000 description 1
- 238000005470 impregnation Methods 0.000 description 1
- 229920005615 natural polymer Polymers 0.000 description 1
- 238000001556 precipitation Methods 0.000 description 1
- 238000000746 purification Methods 0.000 description 1
- 238000004064 recycling Methods 0.000 description 1
- 239000010902 straw Substances 0.000 description 1
- 238000004065 wastewater treatment Methods 0.000 description 1
- 238000005303 weighing Methods 0.000 description 1
- 230000003245 working effect Effects 0.000 description 1
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- Separation Using Semi-Permeable Membranes (AREA)
Abstract
The invention provides a membrane filter technology for exacting semi fibers by using viscose fiber pressed alkali liquor as raw materials. The technology is characterized in that the pressed liquor produced by viscose fibers is firstly processed in a pre-filter manner to remove impurities with large particles, the penetrated liquor is concentrated two to four times in a circulating manner through a nano filter film, the final concentrated liquor enters the diffusion dialysis cation exchange membrane pile, the acid is added into the obtained concentrated liquor to neutralize so as to obtain semi fiber liquor; the nano filter membrane is concentrated two to four times in a circulating manner, and before filtration each time, the material liquor is diluted by adding the water to enter the nano filter film. The alkali containing concentration of the obtained semi fiber liquor is low, the salinity is low, the purity of the semi fibers is high, the operating efficiency of the technology is high, and the technology is suitable for mass production.
Description
Technical field
The invention belongs to the recycling field of viscose fiber, be specifically related to a kind of with the membrane filtration process of viscose fiber press lye for raw material extraction half fibre.
Background technology
Hemicellulose is the natural polymer that the whole world extensively exists,, Greenhouse effect day by day exhausted at the energy are day by day serious, the exploitation of biomass are more and more subject to the attention of the mankind, but also there is many difficult points at present, the comprehensive utilization of hemicellulose is all the more so, hemicellulose is due to the shortcoming of himself, and as easily degraded, difficult separation etc., its utility value is often easily ignored by people.
At chemical pulp plant celluloses such as () wood pulp, cotton pulp, straw pulp, reed pulps in the production process of viscose fiber of raw material, adopting alkali lye to process (dipping, squeezing) to Mierocrystalline cellulose is the first step manufacturing viscose fiber.Hemicellulose concentration is high, extremely adverse influence is produced to cellulose viscose manufacturing technique and final product quality, therefore must in impregnation technology with alkali lye by hemicellulose stripping, the Mierocrystalline cellulose of high strength could be obtained, so a large amount of high concentration alkali pressed liquors being rich in hemicellulose can be produced in above process.
Main component in alkali pressed liquor is sodium hydroxide and hemicellulose.Hemicellulose is therefrom separated by treatment process many employings nanofiltration of existing press lye, obtains comparatively pure alkali lye.Through purification alkali lye can direct reuse in technique, but part alkali only can be realized reuse by nanofiltration membrane, still containing a large amount of alkali in the concentrated solution that the hemicellulose in its trapped fluid obtains after concentrated.During at present this part feed liquid is used for as salkali waste and technique, hemicellulose enters wastewater treatment, or adopts calcination to reclaim sodium hydroxide, and hemicellulose is burned.From above existing technique, hemicellulose is not fully used.
As 201410091864.9, the application for a patent for invention that name is called " extracting the fine method of regenerated cellulose fibre steeping fluid half and half fine application ", the fine method of centrifugal extraction regenerated cellulose fibre steeping fluid half is added with membrane concentration, concrete steps comprise: obtaining containing alkali concn by pressed liquor through three dilutions and three membrane concentration is 26.5 grams per liters, and half fine concentration is the concentrated solution of 65 grams per liters; Concentrated solution whizzer is carried again, obtains half fine solid.Half fine solid is used for the allotment acid bath of regenerated cellulose fibre production acid bath workshop, and half fibre is spray-dried to be produced for Xylitol.The alkali concn of this patent is also higher, forms the salinity of higher concentration after neutralization of the acids, makes half fine purity low; And the yield that half fine solid is extracted in employing centrifugation is low.
201310515214.8, name is called the application for a patent for invention of " method extracting hemicellulose from vegetable fibre ", vegetable fibre is dissolved with the alkaline solution that massfraction is 5% ~ 15%, then large granular impurity is removed through squeezing the alkali lye obtained through conventional pre-filtering method, again alkali lye is entered ceramic membrane device by pump and carry out cross flow filter, by the concentrated solution acid neutralization obtained, collect the hemicellulose of precipitation and dry, obtaining hemicellulose; Described alkali lye after pre-filtering contains alkali 50 ~ 100g/l, containing hemicellulose 40 ~ 60g/l.This patent does not carry out desalination to the fine liquid of half after acid adding, and salt concentration is higher, and half fine purity is still lower.
201310593785.3, the application for a patent for invention that name is called " a kind of viscose fiber produces the extraction of hemicellulose in waste liquid and quaternised modified method ", its extracting method is carry out separation and Extraction with membrane sepn to the hemicellulose in viscose fiber production waste liquid and alkali lye, and concentrated solution is for containing alkali hemicellulose; Method of modifying is contain alkali hemicellulose for raw material with what extract in viscose fiber production waste liquid, and 2,3-epoxypropyltrimethylchloride chloride is etherifying agent, obtains quaternary ammonium hemicellulose after direct etherificate.
201310593785.3, the application for a patent for invention that name is called " a kind of viscose fiber produces the extraction of hemicellulose in waste liquid and quaternised modified method ", its extracting method is carry out separation and Extraction with membrane sepn to the hemicellulose in viscose fiber production waste liquid and alkali lye, and concentrated solution is for containing alkali hemicellulose; Method of modifying is contain alkali hemicellulose for raw material with what extract in viscose fiber production waste liquid, and 2,3-epoxypropyltrimethylchloride chloride is etherifying agent, obtains quaternary ammonium hemicellulose after direct etherificate.It is little that the film list that this patent adopts props up filtration area, and operational efficiency is low, and running cost is high, is unfavorable for scale operation.
Summary of the invention
For above-mentioned technical problem, the invention provides a kind of with the membrane filtration process of viscose fiber press lye for raw material extraction half fibre.The alkali obtaining half fine liquid is dense low, and salinity is low, and half fine purity is high, and process operation efficiency is high, is adapted to scale operation.
For achieving the above object, the present invention adopts following technical scheme:
With viscose fiber press lye for raw material extracts half fine membrane filtration process, it is characterized in that: the pressed liquor that viscose fiber is produced is first through pre-filtering removing large granular impurity, permeate is through concentrated 2-4 time of nanofiltration membrane circulation, last concentrated solution enters diffusion dialysis cationic exchange membrane stack, by the concentrated solution acid neutralization obtained, obtain half fine liquid; Concentrated 2-4 time of described nanofiltration membrane circulation, before each filtration, feed liquid all enters nanofiltration membrane after thin up.
The running cost of nanofiltration membrane, lower than diffusion dialysis, first adopts repeatedly nanofiltration membrane progressively to drop to certain degree dense for alkali, concentrated half fibre, little to the damage of film, re-use diffusion dialysis fine to improve concentrated solution half, reduce alkali dense, thus reduce whole production cost and enhance productivity.
The molecular weight cut-off of nanofiltration membrane of the present invention is 200-400, and alkali is separated from permeate, progressively lowers alkali dense, promotes half fine concentration.
The film that diffusion dialysis of the present invention uses is multiple cationic exchange membranes, and the distance between cationic exchange membrane is 0.4-0.9mm, prevents the blocking to diffusion dialysis film.
Described nanofiltration membrane circulation is concentrated, and the amount of thin up is 1 times of stock liquid volume, filters the concentrated solution volume obtained identical with stock liquid volume at every turn.While ensureing filtration efficiency, little to the damage of nanofiltration membrane.
Preferably, described permeate, containing alkali 200-300g/l, containing half fine 40-80 g/l, after nanofiltration membrane circulation is concentrated, obtains concentrated solution containing alkali 12-75g/l, containing half fine 40-80g/l; Containing alkali 2-4g/l in described diffusion dialysis concentrated solution, containing half fine 40-80g/l.Under lowering the dense prerequisite of alkali, ensure the filtration efficiency of film; Be down to minimum by dense for alkali simultaneously, ensure that the purity of half fibre.
Pre-filtering of the present invention refers to, press lye is successively through rotary drum filtration, Plate Filtration and ultrafiltration removing large granular impurity.Pre-filtering makes press lye not containing the solid impurity of more than 5 microns, and protection film is not below damaged by solid impurity.
The temperature of nanofiltration membrane treatment of the present invention is 40-60 DEG C, and the temperature of diffusion dialysis is 15-45 DEG C, and filtration temperature is high, and liquid viscosity is lower, is conducive to filtration efficiency and improves.
The mistake mould difference of nanofiltration membrane of the present invention is 3-4bar, and the mistake mould difference of diffusion dialysis is 0.3-0.8bar.For the feature that viscose glue press lye viscosity is higher, adopt higher pressure reduction to filter, can ensure that half fine concentration in alkali lye reaches processing requirement.
The flow of feed liquid of the present invention in nanofiltration membrane is 25-40m
3/ h, the flow in diffusion dialysis is 2-20mm/s, and the surface velocity that bonding props up film is higher, film is not easy contaminated.
It is 26.8m that the list of described nanofiltration membrane props up filtration area
2,it is a membrane stack 50m that the list of diffusion dialysis cationic exchange membrane props up filtration area
2, single film has larger filtration area under the prerequisite taking less space.
Described concentrated solution acid neutralization, refers to and adds hydrochloric acid neutralization, and the advantage adding hydrochloric acid is that the molecules of salt amount formed is lower, is conducive to the desalination in later stage.
Preferably, described to add in hydrochloric acid and after, concentrated solution, again through nanofiltration membrane desalination, obtains half fine liquid, except the salinity of low half fine liquid, improves half fine purity further.
Preferably, the molecular weight cut-off of described nanofiltration membrane is 100-200.Owing to adopting hydrochloric acid neutralization, the salt of generation is sodium-chlor, and the molecular weight of sodium-chlor is smaller, and far below 100, and half fine molecular weight is much larger than 100, effectively can realize salt and half fine being separated.
Preferably, described nanofiltration membrane desalination, crossing mould difference is 3-4bar, and temperature is 30-40 DEG C, and single filtration area is 26.8 m
2, adapt to the change of low catching molecular, ensure salt and half fine being separated.
Preferably, the material liquid volume before described nanofiltration membrane concentrates is 10-15 times of concentrated solution volume, is conducive to the salt content in reduction by half fibre.
After nanofiltration membrane desalination, the specific conductivity obtaining half fine liquid is 8000-10000 μ s/cm, and ignition residue is 3-6%.
Beneficial effect of the present invention is:
1, the present invention adopts nanofiltration membrane and diffusion dialysis membrane stack combination filtering and concentrating half fibre, because the running cost of nanofiltration membrane is lower than diffusion dialysis, nanofiltration membrane is first adopted repeatedly progressively to drop to certain degree dense for alkali, concentrated half fibre, little to the damage of film, re-use diffusion dialysis fine to improve concentrated solution half, reduce alkali dense, thus reduce whole production cost and enhance productivity.Nanofiltration and diffusion dialysis cooperatively interact, and have complementary advantages, and make containing alkali 2-4g/l in final concentrated solution, containing half fine 40-80 g/l, achieve low alkali dense, height half is fine; And process operation efficiency is high, little to the damage of film, cost is low, is adapted to industrialization scale operation.
2, the amount of nanofiltration membrane thin up of the present invention is 1 times of stock liquid volume, filters the concentrated solution volume obtained identical with stock liquid volume at every turn.This technique can realize nanofiltration membrane water 10m excessively per hour
3left and right, ensure that filtration efficiency; Meanwhile, little to the damage of film, the 2-3 that can reach its quality guarantee period work-ing life doubly, reduces cost to a great extent, is adapted to industrialization scale operation.
3, the present invention adds hydrochloric acid neutralization to the concentrated solution obtained, then adopts molecular weight cut-off to be the nanofiltration membrane desalination of 100-200.In hydrochloric acid and the salt generated be sodium-chlor, the molecular weight of sodium-chlor, far below 100, and half fine molecular weight is much larger than 100, effectively can realize being separated of salt and half fibre.Be conducive to the desalination in later stage, further increase the purity of half fine liquid.
4, the inventive method obtains the specific conductivity of half fine liquid is 8000-10000 μ s/cm, and ignition residue is 3-6%, and ignition residue is the direct indicator weighing inorganic salt, and the massfraction described in half fine liquid shared by inorganic salt is only 3-6%; Specific conductivity is the electrolytical degree existed in reaction liquid, and the main electrolyte of half fine liquid is exactly inorganic salts, so this index also can reflect the number of salinity in product.It is low that low conductivity and ignition residue describe the half fine liquid salinity adopting the inventive method to obtain, and can be directly used in and prepare the byproduct such as xylo-oligosaccharide and Xylitol, the product purity obtained is up to more than 85%.
Embodiment
Below in conjunction with embodiment, essentiality content of the present invention is described in further detail.
Embodiment 1
With viscose fiber press lye for raw material extracts half fine membrane filtration process, the pressed liquor that viscose fiber is produced is first through pre-filtering removing large granular impurity, permeate is through concentrated 2 times of nanofiltration membrane circulation, last concentrated solution enters diffusion dialysis cationic exchange membrane stack, by the concentrated solution acid neutralization obtained, obtain half fine liquid; Concentrated 2 times of described nanofiltration membrane circulation, before each filtration, feed liquid all enters nanofiltration membrane after thin up.
Embodiment 2
With viscose fiber press lye for raw material extracts half fine membrane filtration process, the pressed liquor that viscose fiber is produced is first through pre-filtering removing large granular impurity, permeate is through concentrated 3 times of nanofiltration membrane circulation, last concentrated solution enters diffusion dialysis cationic exchange membrane stack, by the concentrated solution acid neutralization obtained, obtain half fine liquid; Concentrated 3 times of described nanofiltration membrane circulation, before each filtration, feed liquid all enters nanofiltration membrane after thin up.
Embodiment 3
With viscose fiber press lye for raw material extracts half fine membrane filtration process, the pressed liquor that viscose fiber is produced is first through pre-filtering removing large granular impurity, permeate is through concentrated 4 times of nanofiltration membrane circulation, last concentrated solution enters diffusion dialysis cationic exchange membrane stack, by the concentrated solution acid neutralization obtained, obtain half fine liquid; Concentrated 4 times of described nanofiltration membrane circulation, before each filtration, feed liquid all enters nanofiltration membrane after thin up.
Embodiment 4
The present embodiment is substantially the same manner as Example 1, on this basis:
The molecular weight cut-off of described nanofiltration membrane is 200.
Described nanofiltration membrane circulation is concentrated, and the amount of thin up is 1 times of stock liquid volume, filters the concentrated solution volume obtained identical with stock liquid volume at every turn.
The film that described diffusion dialysis uses is multiple cationic exchange membranes, and the distance between cationic exchange membrane is 0.4mm.
Embodiment 5
The present embodiment is substantially the same manner as Example 2, on this basis:
The molecular weight cut-off of described nanofiltration membrane is 400.
Described nanofiltration membrane circulation is concentrated, and the amount of thin up is 1 times of stock liquid volume, filters the concentrated solution volume obtained identical with stock liquid volume at every turn.
The film that described diffusion dialysis uses is multiple cationic exchange membranes, and the distance between cationic exchange membrane is 0.9mm.
Embodiment 6
The present embodiment is substantially the same manner as Example 3, on this basis:
The molecular weight cut-off of described nanofiltration membrane is 300.
Described nanofiltration membrane circulation is concentrated, and the amount of thin up is 1 times of stock liquid volume, filters the concentrated solution volume obtained identical with stock liquid volume at every turn.
The film that described diffusion dialysis uses is multiple cationic exchange membranes, and the distance between cationic exchange membrane is 0.5mm.
Embodiment 7
The present embodiment is substantially the same manner as Example 1, on this basis:
The molecular weight cut-off of described nanofiltration membrane is 250.
Described nanofiltration membrane circulation is concentrated, and the amount of thin up is 1 times of stock liquid volume, filters the concentrated solution volume obtained identical with stock liquid volume at every turn.
The film that described diffusion dialysis uses is multiple cationic exchange membranes, and the distance between cationic exchange membrane is 0.6mm.
Embodiment 8
The present embodiment is substantially the same manner as Example 4, on this basis:
Described permeate, containing alkali 300g/l, containing half fine 80g/l, after nanofiltration membrane circulation is concentrated, obtains concentrated solution containing alkali 75g/l, containing half fine 80g/l; Containing alkali 4g/l in described diffusion dialysis concentrated solution, containing half fine 80g/l.
Embodiment 9
The present embodiment is substantially the same manner as Example 5, on this basis:
Described permeate, containing alkali 260g/l, containing half fine 70g/l, after nanofiltration membrane circulation is concentrated, obtains concentrated solution containing alkali 32.5g/l, containing half fine 80g/l; Containing alkali 3.5g/l in described diffusion dialysis concentrated solution, containing half fine 70g/l.
Embodiment 10
The present embodiment is substantially the same manner as Example 6, on this basis:
Described permeate, containing alkali 200g/l, containing half fine 40g/l, after nanofiltration membrane circulation is concentrated, obtains concentrated solution containing alkali 12.5g/l, containing half fine 40g/l; Containing alkali 2g/l in described diffusion dialysis concentrated solution, containing half fine 40g/l.Embodiment 11
The present embodiment is substantially the same manner as Example 7, on this basis:
Described permeate, containing alkali 220g/l, containing half fine 60g/l, after nanofiltration membrane circulation is concentrated, obtains concentrated solution containing alkali 55g/l, containing half fine 60g/l; Containing alkali 3g/l in described diffusion dialysis concentrated solution, containing half fine 60g/l.
Embodiment 12
The present embodiment is substantially the same manner as Example 8, on this basis:
Described pre-filtering refers to, pressed liquor is successively through rotary drum filtration, Plate Filtration and ultrafiltration removing large granular impurity.
Embodiment 13
The present embodiment is substantially the same manner as Example 9, on this basis:
Described pre-filtering refers to, pressed liquor is successively through rotary drum filtration, Plate Filtration and ultrafiltration removing large granular impurity.
The temperature of described nanofiltration membrane is 40 DEG C, and the temperature of diffusion dialysis is 15 DEG C.
Embodiment 14
The present embodiment is substantially the same manner as Example 10, on this basis:
Described pre-filtering refers to, pressed liquor is successively through rotary drum filtration, Plate Filtration and ultrafiltration removing large granular impurity.
The temperature of described nanofiltration membrane is 60 DEG C, and the temperature of diffusion dialysis is 45 DEG C.
The mistake mould difference of described nanofiltration membrane is 4bar, and the mistake mould difference of diffusion dialysis is 0.8bar.
Embodiment 15
The present embodiment is substantially the same manner as Example 11, on this basis:
Described pre-filtering refers to, pressed liquor is successively through rotary drum filtration, Plate Filtration and ultrafiltration removing large granular impurity.
The temperature of described nanofiltration membrane is 45 DEG C, and the temperature of diffusion dialysis is 20 DEG C.
The mistake mould difference of described nanofiltration membrane is 3bar, and the mistake mould difference of diffusion dialysis is 0.3bar.
The flow of described feed liquid in nanofiltration membrane is 25m
3/ h, the flow in diffusion dialysis process is 2mm/s.
Embodiment 16
The present embodiment is substantially the same manner as Example 11, on this basis:
Described pre-filtering refers to, pressed liquor is successively through rotary drum filtration, Plate Filtration and ultrafiltration removing large granular impurity.
The temperature of described nanofiltration membrane is 55 DEG C, and the temperature of diffusion dialysis is 30 DEG C.
The mistake mould difference of described nanofiltration membrane is 3.6bar, and the mistake mould difference of diffusion dialysis is 0.5bar.
The flow of described feed liquid in nanofiltration membrane is 40m
3/ h, the flow in diffusion dialysis process is 20mm/s.
It is 26.8m that the list of described nanofiltration membrane props up filtration area
2, it is a membrane stack 50m that the list of diffusion dialysis cationic exchange membrane props up filtration area
2.
Embodiment 17
The present embodiment is substantially the same manner as Example 11, on this basis:
Described pre-filtering refers to, pressed liquor is successively through rotary drum filtration, Plate Filtration and ultrafiltration removing large granular impurity.
The temperature of described nanofiltration membrane is 55 DEG C, and the temperature of diffusion dialysis is 35 DEG C.
The mistake mould difference of described nanofiltration membrane is 3.6bar, and the mistake mould difference of diffusion dialysis is 0.6bar.
The flow of described feed liquid in nanofiltration membrane is 30m
3/ h, the flow in diffusion dialysis process is 15mm/s.
It is 26.8m that the list of described nanofiltration membrane props up filtration area
2, it is a membrane stack 50m that the list of diffusion dialysis cationic exchange membrane props up filtration area
2.
Described concentrated solution acid neutralization, refers to and adds hydrochloric acid neutralization.
Embodiment 18
The present embodiment is substantially the same manner as Example 11, on this basis:
Described pre-filtering refers to, pressed liquor is successively through rotary drum filtration, Plate Filtration and ultrafiltration removing large granular impurity.
The temperature of described nanofiltration membrane is 55 DEG C, and the temperature of diffusion dialysis is 25 DEG C.
The mistake mould difference of described nanofiltration membrane is 3bar, and the mistake mould difference of diffusion dialysis is 0.7bar.
The flow of described feed liquid in nanofiltration membrane is 30m
3/ h, the flow in diffusion dialysis process is 10mm/s.
It is 26.8m that the list of described nanofiltration membrane props up filtration area
2, it is a membrane stack 50m that the list of diffusion dialysis cationic exchange membrane props up filtration area
2.
Described concentrated solution acid neutralization, refers to and adds hydrochloric acid neutralization.
Described to add in hydrochloric acid and after, concentrated solution, again through nanofiltration membrane desalination, obtains half fine liquid.
Embodiment 19
The present embodiment is substantially the same manner as Example 11, on this basis:
Described pre-filtering refers to, pressed liquor is successively through rotary drum filtration, Plate Filtration and ultrafiltration removing large granular impurity.
The temperature of described nanofiltration membrane is 46 DEG C, and the temperature of diffusion dialysis is 36 DEG C.
The mistake mould difference of described nanofiltration membrane is 4bar, and the mistake mould difference of diffusion dialysis is 0.45bar.
The flow of described feed liquid in nanofiltration membrane is 28m
3/ h, the flow in diffusion dialysis process is 15mm/s.
It is 26.8m that the list of described nanofiltration membrane props up filtration area
2, it is a membrane stack 50m that the list of diffusion dialysis cationic exchange membrane props up filtration area
2.
Described concentrated solution acid neutralization, refers to and adds hydrochloric acid neutralization.
Described to add in hydrochloric acid and after, concentrated solution, again through nanofiltration membrane desalination, obtains half fine liquid.
The molecular weight cut-off of described nanofiltration membrane is 100.
Embodiment 20
The present embodiment is substantially the same manner as Example 11, on this basis:
Described pre-filtering refers to, pressed liquor is successively through rotary drum filtration, Plate Filtration and ultrafiltration removing large granular impurity.
The temperature of described nanofiltration membrane is 52 DEG C, and the temperature of diffusion dialysis is 26 DEG C.
The mistake mould difference of described nanofiltration membrane is 3.2bar, and the mistake mould difference of diffusion dialysis is 0.4bar.
The flow of described feed liquid in nanofiltration membrane is 32m
3/ h, the flow in diffusion dialysis process is 16mm/s.
It is 26.8m that the list of described nanofiltration membrane props up filtration area
2, it is a membrane stack 50m that the list of diffusion dialysis cationic exchange membrane props up filtration area
2.
Described concentrated solution acid neutralization, refers to and adds hydrochloric acid neutralization.
Described to add in hydrochloric acid and after, concentrated solution, again through nanofiltration membrane desalination, obtains half fine liquid.
The molecular weight cut-off of described nanofiltration membrane is 200.
The mistake mould difference of described nanofiltration membrane is 4bar, and temperature is 40 DEG C, and single filtration area is 26.8 m
2.
Embodiment 21
The present embodiment is substantially the same manner as Example 11, on this basis:
Described pre-filtering refers to, pressed liquor is successively through rotary drum filtration, Plate Filtration and ultrafiltration removing large granular impurity.
The temperature of described nanofiltration membrane is 42 DEG C, and the temperature of diffusion dialysis is 32 DEG C.
The mistake mould difference of described nanofiltration membrane is 3.2bar, and the mistake mould difference of diffusion dialysis is .05bar.
The flow of described feed liquid in nanofiltration membrane is 28m
3/ h, the flow in diffusion dialysis process is 12mm/s.
It is 26.8m that the list of described nanofiltration membrane props up filtration area
2, it is a membrane stack 50m that the list of diffusion dialysis cationic exchange membrane props up filtration area
2.
Described concentrated solution acid neutralization, refers to and adds hydrochloric acid neutralization.
Described to add in hydrochloric acid and after, concentrated solution, again through nanofiltration membrane desalination, obtains half fine liquid.
The molecular weight cut-off of described nanofiltration membrane is 120.
The mistake mould difference of described nanofiltration membrane is 3bar, and temperature is 30 DEG C, and single filtration area is 26.8 m
2.
Material liquid volume before described nanofiltration membrane concentrates is 10 times of concentrated solution volume.
Embodiment 22
The present embodiment is substantially the same manner as Example 11, on this basis:
Described pre-filtering refers to, pressed liquor is successively through rotary drum filtration, Plate Filtration and ultrafiltration removing large granular impurity.
The temperature of described nanofiltration membrane is 48 DEG C, and the temperature of diffusion dialysis is 36 DEG C.
The mistake mould difference of described nanofiltration membrane is 3bar, and the mistake mould difference of diffusion dialysis is 0.6bar.
The flow of described feed liquid in nanofiltration membrane is 32m
3/ h, the flow in diffusion dialysis process is 16mm/s.
It is 26.8m that the list of described nanofiltration membrane props up filtration area
2, it is a membrane stack 50m that the list of diffusion dialysis cationic exchange membrane props up filtration area
2.
Described concentrated solution acid neutralization, refers to and adds hydrochloric acid neutralization.
Described to add in hydrochloric acid and after, concentrated solution, again through nanofiltration membrane desalination, obtains half fine liquid.
The molecular weight cut-off of described nanofiltration membrane is 150.
The mistake mould difference of described nanofiltration membrane is 3.3bar, and temperature is 35 DEG C, and single filtration area is 26.8 m
2.
Material liquid volume before described nanofiltration membrane concentrates is 15 times of concentrated solution volume.
The described specific conductivity obtaining half fine liquid is 8000 μ s/cm, and ignition residue is 3%.
Embodiment 23
The present embodiment is substantially the same manner as Example 10, on this basis:
Described pre-filtering refers to, pressed liquor is successively through rotary drum filtration, Plate Filtration and ultrafiltration removing large granular impurity.
The temperature of described nanofiltration membrane is 55 DEG C, and the temperature of diffusion dialysis is 25 DEG C.
The mistake mould difference of described nanofiltration membrane is 3bar, and the mistake mould difference of diffusion dialysis is 0.55bar.
The flow of described feed liquid in nanofiltration membrane is 36m
3/ h, the flow in diffusion dialysis process is 18mm/s.
It is 26.8m that the list of described nanofiltration membrane props up filtration area
2, it is a membrane stack 50m that the list of diffusion dialysis cationic exchange membrane props up filtration area
2.
Described concentrated solution acid neutralization, refers to and adds hydrochloric acid neutralization.
Described to add in hydrochloric acid and after, concentrated solution, again through nanofiltration membrane desalination, obtains half fine liquid.
The molecular weight cut-off of described nanofiltration membrane is 130.
The mistake mould difference of described nanofiltration membrane is 3.2bar, and temperature is 32 DEG C, and single filtration area is 26.8 m
2.
Material liquid volume before described nanofiltration membrane concentrates is 12 times of concentrated solution volume.
The described specific conductivity obtaining half fine liquid is 10000 μ s/cm, and ignition residue is 6%.
Embodiment 24
The present embodiment is substantially the same manner as Example 9, on this basis:
Described pre-filtering refers to, pressed liquor is successively through rotary drum filtration, Plate Filtration and ultrafiltration removing large granular impurity.
The temperature of described nanofiltration membrane is 55 DEG C, and the temperature of diffusion dialysis is 36 DEG C.
The mistake mould difference of described nanofiltration membrane is 3.6bar, and the mistake mould difference of diffusion dialysis is 0.6bar.
The flow of described feed liquid in nanofiltration membrane is 35m
3/ h, the flow in diffusion dialysis process is 20mm/s.
It is 26.8m that the list of described nanofiltration membrane props up filtration area
2, it is a membrane stack 50m that the list of diffusion dialysis cationic exchange membrane props up filtration area
2.
Described concentrated solution acid neutralization, refers to and adds hydrochloric acid neutralization.
Described to add in hydrochloric acid and after, concentrated solution, again through nanofiltration membrane desalination, obtains half fine liquid.
The molecular weight cut-off of described nanofiltration membrane is 155.
The mistake mould difference of described nanofiltration membrane is 3.8bar, and temperature is 36 DEG C, and single filtration area is 26.8 m
2.
Material liquid volume before described nanofiltration membrane concentrates is 13 times of concentrated solution volume.
The described specific conductivity obtaining half fine liquid is 9000 μ s/cm, and ignition residue is 4%.
Embodiment 25
The present embodiment is substantially the same manner as Example 11, on this basis:
Described pre-filtering refers to, pressed liquor is successively through rotary drum filtration, Plate Filtration and ultrafiltration removing large granular impurity.
The temperature of described nanofiltration membrane is 42 DEG C, and the temperature of diffusion dialysis is 18 DEG C.
The mistake mould difference of described nanofiltration membrane is 3bar, and the mistake mould difference of diffusion dialysis is 0.4bar.
The flow of described feed liquid in nanofiltration membrane is 28m
3/ h, the flow in diffusion dialysis process is 8mm/s.
It is 26.8m that the list of described nanofiltration membrane props up filtration area
2, it is a membrane stack 50m that the list of diffusion dialysis cationic exchange membrane props up filtration area
2.
Described concentrated solution acid neutralization, refers to and adds hydrochloric acid neutralization.
Described to add in hydrochloric acid and after, concentrated solution, again through nanofiltration membrane desalination, obtains half fine liquid.
The molecular weight cut-off of described nanofiltration membrane is 160.
The mistake mould difference of described nanofiltration membrane is 4bar, and temperature is 32 DEG C, and single filtration area is 26.8 m
2.
Material liquid volume before described nanofiltration membrane concentrates is 11 times of concentrated solution volume.
The described specific conductivity obtaining half fine liquid is 9500 μ s/cm, and ignition residue is 5%.
Claims (16)
1. with the membrane filtration process of viscose fiber press lye for raw material extraction half fibre, it is characterized in that: the pressed liquor that viscose fiber is produced is first through pre-filtering removing large granular impurity, permeate is through concentrated 2-4 time of nanofiltration membrane circulation, last concentrated solution enters diffusion dialysis cationic exchange membrane stack, by the concentrated solution acid neutralization obtained, obtain half fine liquid; Concentrated 2-4 time of described nanofiltration membrane circulation, before each filtration, feed liquid all enters nanofiltration membrane after thin up.
2. according to claim 1 with the membrane filtration process of viscose fiber press lye for raw material extraction half fibre, it is characterized in that: the molecular weight cut-off of described nanofiltration membrane is 200-400.
3. according to claim 1 with the membrane filtration process of viscose fiber press lye for raw material extraction half fibre, it is characterized in that: described nanofiltration membrane circulation is concentrated, the amount of thin up is 1 times of stock liquid volume, filters the concentrated solution volume obtained identical with stock liquid volume at every turn.
4. according to claim 1 with the membrane filtration process of viscose fiber press lye for raw material extraction half fibre, it is characterized in that: the film that described diffusion dialysis uses is multiple cationic exchange membranes, and the distance between cationic exchange membrane is 0.4-0.9mm.
5. according to claim 4 with the membrane filtration process of viscose fiber press lye for raw material extraction half fibre, it is characterized in that: described permeate contains alkali 200-300g/l, containing half fine 40-80 g/l, after nanofiltration membrane circulation is concentrated, obtain concentrated solution containing alkali 12-75g/l, containing half fine 40-80g/l; Containing alkali 2-4g/l in described diffusion dialysis concentrated solution, containing half fine 40-80g/l.
6. according to claim 1ly extract half fine membrane filtration process with viscose fiber press lye for raw material, it is characterized in that: described pre-filtering refers to, pressed liquor filters through rotary drum successively, Plate Filtration and ultrafiltration removing large granular impurity.
7. according to claim 1 with the membrane filtration process of viscose fiber press lye for raw material extraction half fibre, it is characterized in that: the temperature of described nanofiltration membrane treatment is 40-60 DEG C, the temperature of diffusion dialysis is 15-45 DEG C.
8. according to claim 1 with the membrane filtration process of viscose fiber press lye for raw material extraction half fibre, it is characterized in that: the mistake mould difference of described nanofiltration membrane is 3-4bar, and the mistake mould difference of diffusion dialysis is 0.3-0.8bar.
9. according to claim 1 with the membrane filtration process of viscose fiber press lye for raw material extraction half fibre, it is characterized in that: the flow of described feed liquid in nanofiltration membrane is 25-40m
3/ h, the flow in diffusion dialysis process is 2-20mm/s.
10. according to claim 1 with the membrane filtration process of viscose fiber press lye for raw material extraction half fibre, it is characterized in that: it is 26.8m that the list of described nanofiltration membrane props up filtration area
2, it is a membrane stack 50m that the list of diffusion dialysis cationic exchange membrane props up filtration area
2.
11. according to claim 1ly extract half fine membrane filtration process with viscose fiber press lye for raw material, it is characterized in that: described acid neutralization, refer to and add hydrochloric acid neutralization.
12. according to claim 11ly extract half fine membrane filtration process with viscose fiber press lye for raw material, it is characterized in that: described to add in hydrochloric acid and after, concentrated solution, again through nanofiltration membrane desalination, obtains half fine liquid.
13. is according to claim 12 with the membrane filtration process of viscose fiber press lye for raw material extraction half fibre, it is characterized in that: the molecular weight cut-off of described nanofiltration membrane is 100-200.
14. is according to claim 12 with the membrane filtration process of viscose fiber press lye for raw material extraction half fibre, it is characterized in that: the mistake mould difference of described nanofiltration membrane is 3-4bar, and temperature is 30-40 DEG C, and single filtration area is 26.8 m
2.
15. is according to claim 12 with the membrane filtration process of viscose fiber press lye for raw material extraction half fibre, it is characterized in that: the material liquid volume before described nanofiltration membrane concentrates is 10-15 times of concentrated solution volume.
16. according to claim 12ly extract half fine membrane filtration process with viscose fiber press lye for raw material, it is characterized in that: described in obtain half fine liquid specific conductivity be 8000-10000 μ s/cm, ignition residue is 3-6%.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112955408A (en) * | 2018-11-12 | 2021-06-11 | 连津格股份公司 | Device and method for recovering alkaline solution and device and method for producing regenerated cellulose moulded bodies having such a method |
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