CN102021854B - Method for pulping cotton linter - Google Patents
Method for pulping cotton linter Download PDFInfo
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- CN102021854B CN102021854B CN2010105115662A CN201010511566A CN102021854B CN 102021854 B CN102021854 B CN 102021854B CN 2010105115662 A CN2010105115662 A CN 2010105115662A CN 201010511566 A CN201010511566 A CN 201010511566A CN 102021854 B CN102021854 B CN 102021854B
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- cotton linter
- stewing
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- temperature
- pulp
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- 229920000742 Cotton Polymers 0.000 title claims abstract description 37
- 238000000034 method Methods 0.000 title claims abstract description 22
- 238000004537 pulping Methods 0.000 title abstract description 4
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 claims abstract description 42
- MHAJPDPJQMAIIY-UHFFFAOYSA-N Hydrogen peroxide Chemical compound OO MHAJPDPJQMAIIY-UHFFFAOYSA-N 0.000 claims abstract description 27
- 239000000463 material Substances 0.000 claims abstract description 17
- 238000006243 chemical reaction Methods 0.000 claims abstract description 4
- 238000009835 boiling Methods 0.000 claims description 24
- 230000000740 bleeding effect Effects 0.000 claims description 16
- 238000010790 dilution Methods 0.000 claims description 12
- 239000012895 dilution Substances 0.000 claims description 12
- 239000000243 solution Substances 0.000 claims description 8
- 238000007514 turning Methods 0.000 claims description 8
- 238000009413 insulation Methods 0.000 claims description 7
- CSNNHWWHGAXBCP-UHFFFAOYSA-L Magnesium sulfate Chemical compound [Mg+2].[O-][S+2]([O-])([O-])[O-] CSNNHWWHGAXBCP-UHFFFAOYSA-L 0.000 claims description 6
- 229910052943 magnesium sulfate Inorganic materials 0.000 claims description 3
- 235000019341 magnesium sulphate Nutrition 0.000 claims description 3
- 239000000835 fiber Substances 0.000 abstract description 11
- 238000004061 bleaching Methods 0.000 abstract description 6
- 239000000126 substance Substances 0.000 abstract description 5
- 238000005406 washing Methods 0.000 abstract description 4
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 abstract 2
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 abstract 1
- 239000000428 dust Substances 0.000 abstract 1
- 229910052742 iron Inorganic materials 0.000 abstract 1
- 239000001301 oxygen Substances 0.000 abstract 1
- 229910052760 oxygen Inorganic materials 0.000 abstract 1
- 208000032843 Hemorrhage Diseases 0.000 description 15
- 208000034158 bleeding Diseases 0.000 description 15
- 239000002002 slurry Substances 0.000 description 15
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 15
- 238000010411 cooking Methods 0.000 description 6
- 239000003513 alkali Substances 0.000 description 5
- 238000001914 filtration Methods 0.000 description 5
- 239000007788 liquid Substances 0.000 description 5
- 230000009257 reactivity Effects 0.000 description 5
- 238000010009 beating Methods 0.000 description 4
- 239000007844 bleaching agent Substances 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- 229920000609 methyl cellulose Polymers 0.000 description 3
- 239000001923 methylcellulose Substances 0.000 description 3
- 239000000203 mixture Substances 0.000 description 3
- 238000004062 sedimentation Methods 0.000 description 3
- 239000010865 sewage Substances 0.000 description 3
- 241000209094 Oryza Species 0.000 description 2
- 235000007164 Oryza sativa Nutrition 0.000 description 2
- QAOWNCQODCNURD-UHFFFAOYSA-N Sulfuric acid Chemical compound OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 description 2
- 238000003556 assay Methods 0.000 description 2
- 238000000354 decomposition reaction Methods 0.000 description 2
- 230000029087 digestion Effects 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 239000012467 final product Substances 0.000 description 2
- 239000004519 grease Substances 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 235000009566 rice Nutrition 0.000 description 2
- 238000010129 solution processing Methods 0.000 description 2
- 229910000975 Carbon steel Inorganic materials 0.000 description 1
- 229920002488 Hemicellulose Polymers 0.000 description 1
- 239000007864 aqueous solution Substances 0.000 description 1
- WDIHJSXYQDMJHN-UHFFFAOYSA-L barium chloride Chemical compound [Cl-].[Cl-].[Ba+2] WDIHJSXYQDMJHN-UHFFFAOYSA-L 0.000 description 1
- 229910001626 barium chloride Inorganic materials 0.000 description 1
- 235000013405 beer Nutrition 0.000 description 1
- 239000010962 carbon steel Substances 0.000 description 1
- 238000011109 contamination Methods 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 238000001035 drying Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000004945 emulsification Methods 0.000 description 1
- 229910052739 hydrogen Inorganic materials 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- -1 irony Substances 0.000 description 1
- 235000021440 light beer Nutrition 0.000 description 1
- 229920005610 lignin Polymers 0.000 description 1
- 239000007791 liquid phase Substances 0.000 description 1
- 150000007524 organic acids Chemical class 0.000 description 1
- 239000005416 organic matter Substances 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- 239000011087 paperboard Substances 0.000 description 1
- 238000002161 passivation Methods 0.000 description 1
- 238000006116 polymerization reaction Methods 0.000 description 1
- 239000000376 reactant Substances 0.000 description 1
- 238000005070 sampling Methods 0.000 description 1
- 239000004576 sand Substances 0.000 description 1
- 238000007127 saponification reaction Methods 0.000 description 1
- 238000012216 screening Methods 0.000 description 1
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Abstract
The invention provides a method for pulping cotton linter, which can reduce COD (Chemical Oxygen Demand) in black liquor generated by stewing to be less than 8,000mg/L and simultaneously improve the reaction performance of cotton pulp. The method for pulping cotton linter comprises the stewing step, wherein the stewing step comprises the following concrete steps of: (1) mixing the cotton linter with sodium hydroxide solution and preserving the temperature at the stewing temperature; (2) releasing the steam; (3) adding hydrogen peroxide diluted solution when the gauge pressure is less than 0.05MPa, wherein the weight of H2O2 is 3-6 percent that of the cotton linter, and pouring materials treated at the temperature of 80-100DEG C. By using the invention, the stewing quality and bleaching of the stewing pulp can be ensured, and a large amount of organic matters in the black liquor can be oxygenolyzed and settled. Before washing materials, a sample is taken out from a washing pool and detected, wherein the fiber whiteness is more than 60 percent, the dust content is less than 0.9 percent, the iron content is less than 60ppm and the reaction performance is not more than 50s; meanwhile, the COD in the filtered black liquor is reduced to be less than 8,000mg/L from 100,000-160,000mg/L in the prior art.
Description
Technical field
The present invention relates to a kind of method of pulp-making of cotton linter.
Background technology
In China's chemical fibre and purified cotton production field, pulp-making of cotton linter may further comprise the steps: boiling, wash material, making beating, desanding, bleach, copy slurry, the block diagram of whole production technology is as shown in Figure 1.Wherein the cotton linter boiling to through feeding intake, once intensification, once little steam bleeding, secondary temperature elevation, the little steam bleeding of secondary, three times heat up, insulation, big steam bleeding, add warm water, ten programs of batch turning.Boiling reaches the intensification purpose through in rotary spherical digester, feeding high-temperature water vapor, the temperature and the gauge pressure that require when adopting the method for the little steam bleeding in intensification limit, known limit (referring to Fig. 3) to realize insulation.Cotton linter through saponification and emulsification, is removed impurity such as grease, wax, irony, ash at holding stage during boiling, fully destroys primary wall, the secondary wall of fiber, reduces the cellulosic degree of polymerization, improves the relative amount of methylcellulose.Digestion process can produce a large amount of black liquor, and wherein COD is 100,000～160,000 mg/L, NaOH 10～15g/L, and main component comprises lignin, hemicellulose, organic acid and a large amount of black organic matter can severe contamination water quality.
Present domestic colleague and relevant R&D institution were successively studied when the cotton linter boiling feeds intake, and added the method that hydrogen peroxide solution carries out boiling and bleaching simultaneously, because reduced final stage of cooking intensification temperature, influenced cooking quality.Because hydrogen peroxide solution can only the bleached fiber top layer, can not infiltrate inside, hydrogen peroxide solution can not be removed the grease and the wax of cotton linter simultaneously, so can not effectively improve the reactivity worth of cotton pulp, can't be used to make the chemical fibre cotton pulp.
Summary of the invention
The present invention provides a kind of method of pulp-making of cotton linter, can the COD in the black liquor of digestion process generation be reduced to＜8000mg/L, effectively improves the reactivity worth of the cotton pulp dregs of rice simultaneously.
The method of said pulp-making of cotton linter comprises the boiling step, and said boiling step may further comprise the steps:
(1) cotton linter mixes with sodium hydroxide solution, insulation under boiling temperature;
(2) steam bleeding;
(3) when gauge pressure＜0.05MPa, add hydrogen peroxide solution dilution, wherein H
2O
2Quality be the 3-6% of cotton linter; 80～100 ℃ of processing batch turnings after 40～60 minutes down.
The present invention can comprise that also conventional slurrying washes the material step in producing.
Among the present invention, unless stated otherwise, during all quality that relates to cotton linter, all in the over dry quality of cotton linter.
Wherein, all process conditions (like alkali charge, cooking pressure and temperature) of step (1) are prior art, and general alkali charge (NaOH/ cotton linter) is 12～17%, and boiling temperature is 168～172 ℃, and cooking pressure is gauge pressure 0.68～0.75MPa.
In the step (3), the processing time is meant from adding the hydrogen peroxide solution dilution and begins to the total time of processing end.The concrete grammar of handling is preferably the liquid that makes earlier in the reactant mixture and carries out interior circulation, to mix, under said treatment temperature, is incubated a period of time then.
The present invention has summed up in the chemical fibre field under the experience and lessons of many failures; Original creation adds the hydrogen peroxide solution dilution behind the big steam bleeding of boiling; Replace the warm water process that adds of the prior art, not only can further guarantee cooking quality, bleaching boiling slurry; Also make the large amount of organic in the black liquor be able to oxidation Decomposition, sedimentation.The color of gained black liquor is also desalinated into the beer look greatly after the boiling, through washing material back COD of sewage for twice less than 3000mg/L, arrives cesspool and mixes with plain boiled water, pass through sedimentation and filtration again after COD less than 200mg/L, get final product allow compliance with emission standards.The hydrogen peroxide solution dilution that adds is meant rare H that concentration 27.5% hydrogen peroxide solution is obtained through the water dilution
2O
2The aqueous solution can make the temperature of system drop to 80～100 ℃ as adding warm water in the prior art like this, thereby the quantity of steam in the rotary spherical digester is reduced, and gauge pressure reduces, and is convenient to batch turning.The consumption of hydrogen peroxide solution dilution and warm water of the prior art are suitable basically, as long as can reach the reaction temperature in the step (3).After adding the hydrogen peroxide solution dilution, the about 10g/L of concentration of NaOH in the rotary spherical digester.Alkali can not only passivation protection carbon steel rotary spherical digester, can also promote the decomposition of hydrogen peroxide solution, makes slurry bleaching.Can add simultaneously a small amount of magnesium sulfate and play the effect of protecting rotary spherical digester and fiber.Feeding intake in the boiling, intensification, little steam bleeding, intensification, insulation, big steam bleeding and batch turning program are prior art, repeat no more at this.
After boiling finished, the batch turning of gained mixture got into diffuser, and boiling slurry warp is washed material twice, pulled an oar, copies slurry process behind the filtration black liquor wherein, need not bleaching, can obtain chemical fibre and use the cotton pulp dregs of rice.Certainly, if the whiteness of cotton pulp pool is had specific (special) requirements, also can be the same with prior art, before copying slurry process, increase bleaching process, but obviously, the consumption of bleaching agent can reduce obviously.Before washing material, sampling detects fibre whiteness＞60% (is 100% with the barium chloride whiteness) from diffuser; Ash＜0.9%; Irony＜60ppm, reactivity worth≤50s, the COD that filters the gained black liquor simultaneously drops to＜8000mg/L from 100,000～160,000 mg/L of the prior art; The light beer look that changes into of black liquor has not had foul smell.Wash the COD＜3000mg/L of material back diffuser outlet sewage for twice, sewage is through reclaiming fiber fines, to cesspool and making beating, copy the next plain boiled water of workshop section such as slurry and mix, neutralize, behind the sedimentation and filtration, gets final product reuse or discharging.
Description of drawings
Fig. 1 is the flow diagram of pulp-making of cotton linter in the prior art;
Fig. 2 is the flow diagram of pulp-making of cotton linter of the present invention;
Fig. 3 is the temperature control curve figure of embodiment 1 and 2.
The specific embodiment
The temperature control curve in the intensification → insulation among the embodiment 1 and 2 in the cooking process → big steam bleeding stage is as shown in Figure 3.Boiling is carried out in 40 cubic metres of rotary spherical digesters, the maximum working pressure (MWP) of rotary spherical digester: 0.8MPa, and maximum allowable operating temperature (M.A.O.T.): 175 ℃, spheroid rotating speed: about 0.45r/min.Rotary spherical digester is the common equipment of this area, and " pulping technique question and answer " (second edition) that concrete structure and operation method are published in China Light Industry Press (publish in August, 2007, Liang Shimei, Zhang Jingxian, Zhang Songshou) 91-93 page or leaf has detailed introduction.
Embodiment 1
1, boiling
(1) feeds intake
In 40 cubic metres of rotary spherical digesters, drop into cotton linter and sodium hydroxide solution, the oven-dry weight that feeds intake of cotton linter is that 4500kg, alkali using rate are that the concentration of 17% (NaOH quality/cotton linter oven-dry weight), sodium hydroxide solution is that 50g/L, sodium hydroxide solution are gone into bulb temperature (being the temperature of sodium hydroxide solution before the goal):>=90 ℃, the consumption of sodium hydroxide solution: 15.3m
3
(2) once heat up
See A-B section among Fig. 3.
(3) once little steam bleeding
See B-C section among Fig. 3.
(4) secondary temperature elevation
See C-D section among Fig. 3.
(5) the little steam bleeding of secondary
See D-E section among Fig. 3.
Heat up for (6) three times
See E-F section among Fig. 3.
(7) insulation
See F-G section among Fig. 3.
(8) big steam bleeding
See G-H section among Fig. 3.
(9) add hydrogen peroxide solution
The quality of hydrogen peroxide solution dilution is 6T, wherein contains 9kg magnesium sulfate, the H of 198kg
2O
2
Gauge pressure＜0.05MPa behind the rotary spherical digester final relief during 105 ℃ of temperature, adds hydrogen peroxide solution; After treating that the hydrogen peroxide solution dilution all adds, under 90～95 ℃ of conditions, carry out following operation: rotary spherical digester is parked in the steam bleeding position, drives the rotary spherical digester circulating pump; Liquid in the rotary spherical digester is extracted out from the rotary spherical digester bottom, squeezes into rotary spherical digester from rotary spherical digester top, makes the liquid in the rotary spherical digester carry out interior circulation after 10 minutes; Stop interior circulation, start rotary spherical digester, rotating operation 10 minutes.From adding the whole processing times of hydrogen peroxide solution before the batch turning is 40 minutes.
(10) batch turning
The hydrogen peroxide solution processing finishes, and temperature is 91 ℃ in the ball, and the artificial spherical cap of opening is poured slurry in the diffuser under the ball into, filters.Filtration obtains black liquor amount 10T (measuring COD:7950mg/L), (the assay method standard: FZ/T51001-1998): methylcellulose content 95.4%, whiteness 62.0% of sample examination in diffuser; Ash 0.88%; Irony 52ppm, reactivity worth 38 seconds, viscosity 11.3mpas.The result meets the FZ/T51001-1998 standard.
2, wash material
In diffuser, wash material twice, total water amount 90m with plain boiled water (copying the slurry backwater)
3, wash the total amount 90m of material gained filtrating for twice
3, measure the COD that washes the filtrating of material for the second time and drop to 2385mg/L.
3, making beating, desanding, copy slurry
Making beating (slurry concentration be controlled at 4%, with two vertebra type jordans, cut staple), desanding (removing sand and screenings) with desander, copy slurry (, also can further bleach before copying slurry) with the raising whiteness like needs after, wet pulp is dewatered through the drying cylinder machine, output stock white paperboard.
4, the processing of black liquor
The black liquor that extrudes during the big steam bleeding of rotary spherical digester is discharged in the black liquor bucket joins alkali, and the sodium hydroxide solution when making concentration sodium hydroxide in the liquid phase reach behind the 50g/L as boiling is recycled.The every operation of black liquor bucket 15 days, black liquor bucket bottom have a large amount of fiber fines and sulfuric acid insoluble matter, regularly clean, deslagging.
Embodiment 2
All the other are with embodiment 1, and difference is
1, during boiling:
(9) add hydrogen peroxide solution
The quality of hydrogen peroxide solution dilution is 6T, wherein contains the pure 100%H of 135kg
2O
2
Gauge pressure＜0.05MPa behind the rotary spherical digester final relief during 105 ℃ of temperature, adds hydrogen peroxide solution; After treating that the hydrogen peroxide solution dilution all adds, under 80～90 ℃ of conditions, carry out following operation: rotary spherical digester is parked in the steam bleeding position, drives the rotary spherical digester circulating pump; Liquid in the rotary spherical digester is extracted out from the rotary spherical digester bottom, squeezes into rotary spherical digester from rotary spherical digester top, makes the liquid in the rotary spherical digester carry out interior circulation after 20 minutes; Stop interior circulation, start rotary spherical digester rotating operation 20 minutes.From adding the whole processing times of hydrogen peroxide solution before the batch turning is 60 minutes.
The hydrogen peroxide solution processing finishes, and temperature is 95 ℃ in the ball, and the artificial spherical cap of opening is poured slurry in the diffuser under the ball into, filters.Filtration obtains black liquor amount 10T (COD:7890mg/L), (the assay method standard: FZ/T51001-1998): methylcellulose content 95.0%, whiteness 611% of sample examination in diffuser; Ash 1.08%; Irony 32ppm, reactivity worth 48 seconds, viscosity 11.3mpas.The result meets the FZ/T51001-1998 standard.
2, wash material
In diffuser, wash material twice, total water amount 90m with plain boiled water (copying the slurry backwater)
3(plain boiled water is not enough.Available running water), wash the total amount 90m of material gained filtrating for twice
3, measure the COD that washes material filtrating for the second time and drop to 2850mg/L.
Claims (3)
1. the method for a pulp-making of cotton linter is characterized in that the boiling step, and said boiling step may further comprise the steps:
(1) cotton linter mixes with sodium hydroxide solution, insulation under boiling temperature;
(2) steam bleeding;
(3) when gauge pressure＜0.05MPa, add hydrogen peroxide solution dilution, wherein H
2O
2Quality be the 3-6% of cotton linter; 80～100 ℃ of reaction batch turnings after 40～60 minutes down.
2. the method for pulp-making of cotton linter as claimed in claim 1 is characterized in that also adding in the step (3) magnesium sulfate that quality is a cotton linter 0.2%.
3. according to claim 1 or claim 2 the method for pulp-making of cotton linter is characterized in that also comprising after the boiling step and washes the material step.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010105115662A CN102021854B (en) | 2010-10-19 | 2010-10-19 | Method for pulping cotton linter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010105115662A CN102021854B (en) | 2010-10-19 | 2010-10-19 | Method for pulping cotton linter |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN102021854A CN102021854A (en) | 2011-04-20 |
| CN102021854B true CN102021854B (en) | 2012-04-18 |
Family
ID=43863597
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2010105115662A Active CN102021854B (en) | 2010-10-19 | 2010-10-19 | Method for pulping cotton linter |
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| Country | Link |
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| CN (1) | CN102021854B (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103352386B (en) * | 2013-06-17 | 2015-06-03 | 如东县海宇纤维制品有限公司 | Cotton linter production line |
| CN103938476B (en) * | 2014-04-14 | 2016-02-17 | 合肥银山棉麻股份有限公司 | A kind of cotton linter soaks into pulping by cooking new method in advance |
| CN107151932B (en) * | 2016-12-08 | 2019-02-05 | 湖北金汉江精制棉有限公司 | A kind of high polymerization degree purified cotton cooking technique |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN86102407B (en) * | 1986-04-12 | 1987-09-02 | 中国人民解放军88352部队 | Cotton linter pulping process capable of solving pollution |
| WO2007123974A2 (en) * | 2006-04-21 | 2007-11-01 | Hercules Incorporated | Decolorized raw cotton linters and preparation of ether derivatives therefrom |
| CN101130934A (en) * | 2006-08-26 | 2008-02-27 | 山东海龙股份有限公司 | Colored cotton linter pulp used for producing viscose fiber and method for making the same |
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