CN108483399A - A kind of VCM purification hydrochloric acid full stripping device and technique - Google Patents
A kind of VCM purification hydrochloric acid full stripping device and technique Download PDFInfo
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- CN108483399A CN108483399A CN201810530338.6A CN201810530338A CN108483399A CN 108483399 A CN108483399 A CN 108483399A CN 201810530338 A CN201810530338 A CN 201810530338A CN 108483399 A CN108483399 A CN 108483399A
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- hydrochloric acid
- tower
- dilute hydrochloric
- concentrated hydrochloric
- vcm
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- VEXZGXHMUGYJMC-UHFFFAOYSA-N Hydrochloric acid Chemical compound Cl VEXZGXHMUGYJMC-UHFFFAOYSA-N 0.000 title claims abstract description 320
- 238000000034 method Methods 0.000 title claims abstract description 31
- 238000000746 purification Methods 0.000 title claims abstract description 30
- 239000002253 acid Substances 0.000 claims abstract description 60
- 239000002351 wastewater Substances 0.000 claims abstract description 45
- IXCSERBJSXMMFS-UHFFFAOYSA-N hydrogen chloride Substances Cl.Cl IXCSERBJSXMMFS-UHFFFAOYSA-N 0.000 claims abstract description 43
- 229910000041 hydrogen chloride Inorganic materials 0.000 claims abstract description 42
- 239000003595 mist Substances 0.000 claims abstract description 13
- 238000005660 chlorination reaction Methods 0.000 claims abstract description 12
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 claims abstract description 11
- 239000001257 hydrogen Substances 0.000 claims abstract description 11
- 229910052739 hydrogen Inorganic materials 0.000 claims abstract description 11
- 235000011167 hydrochloric acid Nutrition 0.000 claims description 91
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 27
- 239000007789 gas Substances 0.000 claims description 24
- 229920006395 saturated elastomer Polymers 0.000 claims description 24
- 238000001816 cooling Methods 0.000 claims description 14
- 239000000243 solution Substances 0.000 claims description 12
- 238000004458 analytical method Methods 0.000 claims description 8
- 238000010438 heat treatment Methods 0.000 claims description 7
- 239000007921 spray Substances 0.000 claims description 7
- 230000008676 import Effects 0.000 claims description 6
- 238000000926 separation method Methods 0.000 claims description 6
- 238000001704 evaporation Methods 0.000 claims description 4
- 230000008020 evaporation Effects 0.000 claims description 4
- 238000012545 processing Methods 0.000 claims description 4
- QAOWNCQODCNURD-UHFFFAOYSA-N Sulfuric acid Chemical compound OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 claims description 3
- 239000012141 concentrate Substances 0.000 claims description 3
- 239000008246 gaseous mixture Substances 0.000 claims description 3
- 238000011084 recovery Methods 0.000 claims description 3
- 238000002347 injection Methods 0.000 claims description 2
- 239000007924 injection Substances 0.000 claims description 2
- UXVMQQNJUSDDNG-UHFFFAOYSA-L Calcium chloride Chemical compound [Cl-].[Cl-].[Ca+2] UXVMQQNJUSDDNG-UHFFFAOYSA-L 0.000 abstract description 17
- 239000001110 calcium chloride Substances 0.000 abstract description 13
- 229910001628 calcium chloride Inorganic materials 0.000 abstract description 13
- 239000002699 waste material Substances 0.000 abstract description 7
- 239000007788 liquid Substances 0.000 description 5
- 238000009833 condensation Methods 0.000 description 4
- 230000005494 condensation Effects 0.000 description 4
- 229920000915 polyvinyl chloride Polymers 0.000 description 4
- 239000004800 polyvinyl chloride Substances 0.000 description 4
- 238000006073 displacement reaction Methods 0.000 description 3
- 239000000463 material Substances 0.000 description 3
- 230000001105 regulatory effect Effects 0.000 description 3
- 150000003839 salts Chemical class 0.000 description 3
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 2
- 238000009835 boiling Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- OYPRJOBELJOOCE-UHFFFAOYSA-N Calcium Chemical compound [Ca] OYPRJOBELJOOCE-UHFFFAOYSA-N 0.000 description 1
- 239000005997 Calcium carbide Substances 0.000 description 1
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- VEXZGXHMUGYJMC-UHFFFAOYSA-M Chloride anion Chemical compound [Cl-] VEXZGXHMUGYJMC-UHFFFAOYSA-M 0.000 description 1
- ZAMOUSCENKQFHK-UHFFFAOYSA-N Chlorine atom Chemical compound [Cl] ZAMOUSCENKQFHK-UHFFFAOYSA-N 0.000 description 1
- VGGSQFUCUMXWEO-UHFFFAOYSA-N Ethene Chemical compound C=C VGGSQFUCUMXWEO-UHFFFAOYSA-N 0.000 description 1
- 239000005977 Ethylene Substances 0.000 description 1
- HCHKCACWOHOZIP-UHFFFAOYSA-N Zinc Chemical compound [Zn] HCHKCACWOHOZIP-UHFFFAOYSA-N 0.000 description 1
- 239000007864 aqueous solution Substances 0.000 description 1
- 229910052791 calcium Inorganic materials 0.000 description 1
- 239000011575 calcium Substances 0.000 description 1
- 159000000007 calcium salts Chemical class 0.000 description 1
- 239000003054 catalyst Substances 0.000 description 1
- 239000000460 chlorine Substances 0.000 description 1
- 229910052801 chlorine Inorganic materials 0.000 description 1
- RCTYPNKXASFOBE-UHFFFAOYSA-M chloromercury Chemical compound [Hg]Cl RCTYPNKXASFOBE-UHFFFAOYSA-M 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005189 flocculation Methods 0.000 description 1
- 230000016615 flocculation Effects 0.000 description 1
- 229910002804 graphite Inorganic materials 0.000 description 1
- 239000010439 graphite Substances 0.000 description 1
- 150000002500 ions Chemical class 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- 230000007257 malfunction Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- QSHDDOUJBYECFT-UHFFFAOYSA-N mercury Chemical compound [Hg] QSHDDOUJBYECFT-UHFFFAOYSA-N 0.000 description 1
- 229910021645 metal ion Inorganic materials 0.000 description 1
- 238000012856 packing Methods 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 238000004064 recycling Methods 0.000 description 1
- CLZWAWBPWVRRGI-UHFFFAOYSA-N tert-butyl 2-[2-[2-[2-[bis[2-[(2-methylpropan-2-yl)oxy]-2-oxoethyl]amino]-5-bromophenoxy]ethoxy]-4-methyl-n-[2-[(2-methylpropan-2-yl)oxy]-2-oxoethyl]anilino]acetate Chemical compound CC1=CC=C(N(CC(=O)OC(C)(C)C)CC(=O)OC(C)(C)C)C(OCCOC=2C(=CC=C(Br)C=2)N(CC(=O)OC(C)(C)C)CC(=O)OC(C)(C)C)=C1 CLZWAWBPWVRRGI-UHFFFAOYSA-N 0.000 description 1
- 238000012546 transfer Methods 0.000 description 1
- 229910052725 zinc Inorganic materials 0.000 description 1
- 239000011701 zinc Substances 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01B—NON-METALLIC ELEMENTS; COMPOUNDS THEREOF; METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C
- C01B7/00—Halogens; Halogen acids
- C01B7/01—Chlorine; Hydrogen chloride
- C01B7/07—Purification ; Separation
- C01B7/0706—Purification ; Separation of hydrogen chloride
- C01B7/0718—Purification ; Separation of hydrogen chloride by adsorption
-
- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01B—NON-METALLIC ELEMENTS; COMPOUNDS THEREOF; METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C
- C01B7/00—Halogens; Halogen acids
- C01B7/01—Chlorine; Hydrogen chloride
- C01B7/07—Purification ; Separation
- C01B7/0706—Purification ; Separation of hydrogen chloride
- C01B7/0712—Purification ; Separation of hydrogen chloride by distillation
Landscapes
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Inorganic Chemistry (AREA)
- Treating Waste Gases (AREA)
Abstract
The present invention relates to a kind of VCM purification hydrochloric acid full stripping devices and techniques, including concentrated hydrochloric acid resolution system and dilute hydrochloric acid vacuum concentration system, concentrated hydrochloric acid resolution system includes the two-way heat exchanger being sequentially connected to, concentrated hydrochloric acid Analytic Tower, level-one hydrogen chloride cooler, secondary chlorination hydrogen cooler, acid mist separator, and two-way heat exchanger lower part is connected by diluted acid cooler with diluted acid medial launder；Dilute hydrochloric acid vacuum concentration system includes dilute hydrochloric acid concentration tower, steam condenser, waste water medial launder, gaseous effluent cooler, diluted acid medial launder is connected with dilute hydrochloric acid concentration tower, dilute hydrochloric acid concentration tower bottom is connected with concentrated hydrochloric acid Analytic Tower, dilute hydrochloric acid concentration tower is sequentially connected with steam condenser, waste water medial launder, and waste water medial launder, which is divided into, not to be connected with dilute hydrochloric acid concentration tower, gaseous effluent cooler.The present invention does not have mercurous dilute waste solution of calcium chloride discharge, have many advantages, such as failure rate it is low, can long period continuous operation, technological process is short, floor space is small, investment is small.
Description
Technical field
The invention belongs to resolving hydrochloric acid technical field, concretely relate to a kind of VCM purification hydrochloric acid full stripping devices and
Technique.
Background technology
By the end of about 23,000,000 tons/year of domestic PVC total productive capacity of in December, 2017, wherein former using calcium carbide
Material process route device accounts for about 83%, remaining is ethylene subtraction unit.In carbide raw material route process units, VCM is purified back
Due to containing mercury element (mercury chloride is the catalyst for being converted into VCM) in the hydrochloric acid of receipts, cannot discharge, therefore VCM is purified back
The hydrochloric acid of receipts has been all made of resolving hydrochloric acid technology, and recycling hydrogen chloride recycles, most in order to solve the problems, such as water balance
Resolving hydrochloric acid device is divided into two parts：The deep analysis (Calcium Chloride Method) of the conventional resolution of concentrated hydrochloric acid+part dilute hydrochloric acid, calcium chloride
The water that method complete solution analysis part mainly parses Low acid (~1%HCL) returns to purification combination water scrubber.Currently running chlorination
There are following disadvantages in commercial practice for the full analysis unit of calcium method dilute hydrochloric acid：
(1), it since Calcium Chloride Method dilute hydrochloric acid complete solution analysis apparatus technological temperature is high (120 DEG C~135 DEG C of bottom temperature), then boils
High (≤the 0.6MPa of steam pressure (G) that device uses), cause the plant failure rate high, especially graphite reboiler.
(2), due to high calcium chloride concentration aqueous solution the characteristics of, it is easy the fouling at reboiler hole wall, leads to its heat transfer effect
Rate declines, and acid content is exceeded in waste water；The chloride especially formed into system dilute hydrochloric acid band by metal ions such as iron, zinc, it is right
Calcium chloride solution has flocculation, gradually causes calcium chloride solution in the gradual fouling of reboiler tube side, can cause in waste water first
Acid content is exceeded, eventually leads to reboiler cisco unity malfunction；So in actual industrialization operation, the service life of reboiler
About at 2~3 years or so, overhaul is needed to handle (returning factory's redrilling).
(3), it blocks, improves the cycle of operation of device in order to prevent, current enterprise uses the chlorine in regular displacement apparatus
The method for changing calcium salt acid solution, prevents harmful ion from accumulating.Typical method is the displacement of the Calcium Chloride Method depth resolver first quarter
The drawbacks of calcium chloride is primary in system, and 4 times or so of year displacement are done so, which is device, must discharge mercurous dilute waste solution of calcium chloride, fill
It sets and does not accomplish real " zero " discharge.And mercurous dilute waste solution of calcium chloride amount for always discharging in year is simultaneously many, with typical 300,000 tons
For PVC devices, annual emissions reach 20~25 tons of mercurous dilute waste solution of calcium chloride, and mercurous waste liquid with high salt needs high processing
Expense.
Invention content
In order to overcome the shortcomings of the prior art, the present invention provides a kind of VCM purification hydrochloric acid full stripping devices and works
Skill.
A kind of VCM purifications hydrochloric acid full stripping device, described device include that concentrated hydrochloric acid resolution system and dilute hydrochloric acid are concentrated in vacuo
System, the concentrated hydrochloric acid resolution system include the two-way heat exchanger being sequentially connected to, concentrated hydrochloric acid Analytic Tower, the cooling of level-one hydrogen chloride
Device, secondary chlorination hydrogen cooler, acid mist separator, the two-way heat exchanger bottom combine deacidifying device with VCM purifications and are connected,
It is connected with concentrated hydrochloric acid Analytic Tower top at the top of two-way heat exchanger, concentrated hydrochloric acid Analytic Tower lower part is connected with two-way heat exchanger top
Logical, the two-way heat exchanger lower part is connected by diluted acid cooler with diluted acid medial launder, and the diluted acid medial launder is purified with VCM
Combination deacidifying device is connected；The concentrated hydrochloric acid parsing tower bottom is connected with parsing tower reboiler bottom, parses tower reboiler
Top is connected with concentrated hydrochloric acid Analytic Tower lower part；
The dilute hydrochloric acid vacuum concentration system includes that dilute hydrochloric acid concentration tower, steam condenser, waste water medial launder, waste water are cold
But device, the diluted acid medial launder are connected with dilute hydrochloric acid concentration tower, and dilute hydrochloric acid concentrates tower bottom and concentration tower reboiler bottom phase
Connection, concentration tower reboiler top are connected with dilute hydrochloric acid concentration tower lower part；The dilute hydrochloric acid concentration tower bottom and concentrated hydrochloric acid solution
Analysis tower is connected, at the top of dilute hydrochloric acid concentration tower be connected at the top of steam condenser, the steam condenser bottom with give up
Water medial launder is connected, and the waste water medial launder, which is divided into, not to be connected with dilute hydrochloric acid concentration tower, gaseous effluent cooler, and the waste water is cold
But device combines deacidifying device with VCM purifications and is connected.
Preferably, the steam condenser bottom is connected with water sprays vacuum pump set, the water injection vacuum machine
Group is connected with waste water medial launder；The water sprays vacuum pump set is also connected with tail gas purification tower.
Preferably, the bottom of the level-one hydrogen chloride cooler, secondary chlorination hydrogen cooler, acid mist separator respectively with
Concentrated hydrochloric acid Analytic Tower top is connected.
Preferably, the parsing tower reboiler top is equipped with the first low-pressure saturated steam import, parse under tower reboiler
Portion is exported equipped with the first steam condensate (SC)；The concentration tower reboiler top is equipped with the second low-pressure saturated steam import, concentration tower
Reboiler lower part is exported equipped with the second steam condensate (SC).
It is connected preferably, the diluted acid medial launder combines deacidifying device by diluted acid delivery pump with VCM purifications, diluted acid
Medial launder in the middle part of diluted acid charge pump and dilute hydrochloric acid concentration tower by being connected.
Preferably, the dilute hydrochloric acid concentration tower bottom is connected by concentrating in the middle part of acid circulating pump and concentrated hydrochloric acid Analytic Tower
It is logical.
It is connected with dilute hydrochloric acid concentration tower top preferably, the waste water medial launder is pumped by return of waste water, in waste water
Between slot by being connected at the top of waste water delivery pump and gaseous effluent cooler.
A kind of technique of VCM purifications hydrochloric acid full stripping, including concentrated hydrochloric acid parsing section and dilute hydrochloric acid are concentrated in vacuo section, described dense
Resolving hydrochloric acid section includes the following steps：
(1) purified from VCM combination deacidifying device concentrated hydrochloric acid first pass around two-way heat exchanger with from concentrated hydrochloric acid Analytic Tower
The high temperature barostat control of discharge carries out reverse heat-exchange, is handled using concentrated hydrochloric acid Analytic Tower is sent into after simultaneously recovery section thermal energy, concentrated hydrochloric acid
In a part of hydrogen chloride be evaporated and parse, centre is entrainment of saturated vapor, into level-one hydrogen chloride cooler, gas phase
Middle major part vapor is condensed, and is saturated by the hydrogen chloride in gas phase, forms 35~40% concentrated hydrochloric acids and is back to concentrated hydrochloric acid
Analytic Tower carries out the intermediate hydrogen chloride gas of redistillation separation；
(2) enter secondary chlorination hydrogen cooler with water gaseous mixture by tentatively cooling hydrogen chloride, the moisture in gas phase obtains
It is saturated to further condensation and by the hydrogen chloride in gas phase, forms 38~42% concentrated hydrochloric acids and be back to concentrated hydrochloric acid Analytic Tower；
(3) hydrogen chloride gas for passing through two-stage cooling low temperature, into acid mist separator, in hydrogen chloride gas cooling procedure
Because of the acid mist separation that condensation generates, hydrogen chloride after processing returns to VCM process units；
The dilute hydrochloric acid is concentrated in vacuo section and includes the following steps：
(1) barostat control of concentrated hydrochloric acid Analytic Tower bottom of tower is resolved tower reboiler evaporation and is used as heating medium, barostat control
After tentatively being cooled down by two-way heat exchanger first, cooled down into diluted acid cooler, it is most of dilute subsequently into dilute hydrochloric acid medial launder
Hydrochloric acid is added by diluted acid conveying pumped back VCM purification combination deacidifying device circularly absorbing hydrogen chlorides, another part dilute hydrochloric acid by diluted acid
Material is pumped into dilute hydrochloric acid concentration tower；
(2) in dilute hydrochloric acid concentration tower under the conditions of certain vacuum degree, the high a part of water of relative volatility in dilute hydrochloric acid
Steam is evaporated out tower, and the dilute hydrochloric acid after concentration sends the cycle parsing of concentrated hydrochloric acid Analytic Tower back to by concentrating acid circulating pump；
(3) evaporate dilute hydrochloric acid concentration tower top water vapour and a small amount of hydrogen chloride condensed by steam condenser after be collected in
In waste water medial launder, the hydrogen chloride content in waste water controls certain regurgitant volume by return of waste water pump and realizes, realizes process goal
Concentration waste water is by waste water conveying pumped back VCM purification combination deacidifying device circularly absorbing hydrogen chlorides.
The present invention is concentrated in vacuo (dilute hydrochloric acid deep analysis) organic assembling using concentrated hydrochloric acid parsing+dilute hydrochloric acid, using dilute salt
Sour vacuum concentration system replaces Calcium Chloride Method dilute hydrochloric acid complete solution and analyses subsystem, changes dilute hydrochloric acid azeotropic concentration under certain vacuum degree
Composition, the water for isolating part Low acid (~1%HCl) return to purification combination water scrubber, solve the water balance of whole device.It should
The advantages of design is the calcium chloride solution for not having in system easy fouling, and system does not have mercurous dilute waste solution of calcium chloride discharge；Simultaneously
Dilute hydrochloric acid vacuum concentration system is run under certain vacuum degree, and dilute hydrochloric acid boiling temperature is low, and the heating steam pressure needed is low, solution
It has determined the integrity problem of device, has met the requirement of new process device long period continuous operation.
Preferably, the vacuum degree of dilute hydrochloric acid concentration tower is realized by water-jet pump unit.
Preferably, parsing tower reboiler makees heat source using 0.5MPa saturated vapors, concentration tower reboiler uses 0.2~
0.25MPa saturated vapors make heat source.For low-pressure saturated steam, relatively rich polyvinyl chloride enterprise is advantageous, can be significantly
Reduce processing cost.
The present invention is not easy the calcium chloride solution of fouling, is discharged without mercurous dilute waste solution of calcium chloride, plant failure rate is low；
Dilute hydrochloric acid vacuum concentration system is run under certain vacuum degree, and dilute hydrochloric acid boiling temperature is low, and the heating steam pressure needed is low
(0.2~0.25MPaG saturated vapors), solves the integrity problem of device, meets new process device long period continuous operation
Requirement；The present invention has many advantages, such as that technological process is short, floor space is small, investment is small.
Description of the drawings
Fig. 1 is the structural diagram of the present invention.
Specific implementation mode
The invention will be further described in the following with reference to the drawings and specific embodiments, but invention which is intended to be protected is simultaneously
It is without being limited thereto.
Referring to Fig.1, a kind of VCM purifies hydrochloric acid full stripping device, and described device includes concentrated hydrochloric acid resolution system 1 and dilute hydrochloric acid
Vacuum concentration system 2, the concentrated hydrochloric acid resolution system include the two-way heat exchanger 3, concentrated hydrochloric acid Analytic Tower 4, level-one being sequentially connected to
Hydrogen chloride cooler 5, secondary chlorination hydrogen cooler 6, acid mist separator 7,3 bottom of the two-way heat exchanger are combined with VCM purifications
Deacidifying device is connected, and the top of two-way heat exchanger 3 is connected with 4 top of concentrated hydrochloric acid Analytic Tower, 4 lower part of concentrated hydrochloric acid Analytic Tower with pair
It is connected to 3 top of heat exchanger, 3 lower part of the two-way heat exchanger is connected by diluted acid cooler 8 with diluted acid medial launder 9, institute
It states diluted acid medial launder 9 deacidifying device is combined by diluted acid delivery pump 22 and VCM purification and be connected；4 bottom of concentrated hydrochloric acid Analytic Tower
Portion is connected with 10 bottom of parsing tower reboiler, and 10 top of parsing tower reboiler is connected with 4 lower part of concentrated hydrochloric acid Analytic Tower；It is described
Level-one hydrogen chloride cooler 5, secondary chlorination hydrogen cooler 6, acid mist separator 7 bottom respectively with 4 top of concentrated hydrochloric acid Analytic Tower
It is connected.
The dilute hydrochloric acid vacuum concentration system include dilute hydrochloric acid concentration tower 11, steam condenser 12, waste water medial launder 13,
Gaseous effluent cooler 14, the diluted acid medial launder 9 are connected by diluted acid charge pump 23 with 11 middle part of dilute hydrochloric acid concentration tower, dilute hydrochloric acid
11 bottom of concentration tower is connected with 15 bottom of concentration tower reboiler, 15 top of concentration tower reboiler and 11 lower part of dilute hydrochloric acid concentration tower
It is connected；11 bottom of dilute hydrochloric acid concentration tower is connected by concentrating acid circulating pump 24 with 4 middle part of concentrated hydrochloric acid Analytic Tower, dilute salt
11 top of sour concentration tower is connected with 12 top of steam condenser, 12 bottom of the steam condenser and waste water medial launder 13
It is connected, the waste water medial launder 13 is connected by return of waste water pump 25 with 11 top of dilute hydrochloric acid concentration tower, waste water medial launder
13 are connected by waste water delivery pump 26 with 14 top of gaseous effluent cooler, and the gaseous effluent cooler 14 combines depickling with VCM purifications
Device is connected.
12 bottom of the steam condenser is connected with water sprays vacuum pump set 16, the water sprays vacuum pump set 16 with
Waste water medial launder 13 is connected；The water sprays vacuum pump set 16 is also connected with tail gas purification tower 17.The Analytic Tower boils again
10 top of device is equipped with the first low-pressure saturated steam import 18, and parsing tower reboiler lower part is equipped with the first steam condensate (SC) and exports 19；
15 top of concentration tower reboiler is equipped with the second low-pressure saturated steam import 20, and concentration tower reboiler lower part is equipped with the second steam
Condensation-water drain 21.
Technique of the above-mentioned apparatus for VCM purification hydrochloric acid full strippings, including concentrated hydrochloric acid parsing section and dilute hydrochloric acid are concentrated in vacuo
Section, the concentrated hydrochloric acid parsing section include the following steps：
(1) concentrated hydrochloric acid (>=31%) that combination deacidifying device is purified from VCM is controlled through flowmeter and regulating valve, first
The high temperature barostat control for first passing through two-way heat exchanger 3 and being discharged from concentrated hydrochloric acid Analytic Tower 4 carries out reverse heat-exchange, utilizes simultaneously recovery section
It is sent into concentrated hydrochloric acid Analytic Tower 4 after thermal energy to handle, concentrated hydrochloric acid is distributed in tower top by disc type liquid distribution trough, is uniformly flowed into and is filled out
The bed of material, after the mixture counter current contacting of packing section and the hydrogen chloride and water that are vaporized by heating is conducted heat, the part in concentrated hydrochloric acid
Hydrogen chloride, which is evaporated, to be parsed, intermediate entrainment of saturated vapor, most of in gas phase into level-one hydrogen chloride cooler 5
Vapor is condensed, and is saturated by the hydrogen chloride in gas phase, forms 35~40% concentrated hydrochloric acids and is back to concentrated hydrochloric acid Analytic Tower
Tower distributor carries out the intermediate hydrogen chloride gas of redistillation separation；
(2) enter secondary chlorination hydrogen cooler 6 with water gaseous mixture by tentatively cooling hydrogen chloride, the moisture in gas phase obtains
It is saturated to further condensation and by the hydrogen chloride in gas phase, forms 38~42% concentrated hydrochloric acids and be back to concentrated hydrochloric acid Analytic Tower 4
Tower distributor；
(3) hydrogen chloride gas for passing through two-stage cooling low temperature, into acid mist separator 7, hydrogen chloride gas cooling procedure
Deep cooling is passed through in almost 100% separation of the middle acid mist generated by condensation in this way, the hydrogen chloride that efficient demisting is dehydrated returns to VCM productions
Device；
The dilute hydrochloric acid is concentrated in vacuo section and includes the following steps：
(1) barostat control of concentrated hydrochloric acid Analytic Tower bottom of tower 19~20% is resolved the evaporation of tower reboiler 10 and makes as heating medium
With, since tower top is continuously replenished fresh concentrated hydrochloric acid, tower reactor section liquid level by regulating valve on diluted acid overflow pipe and liquid level it is chain into
Row adjusting control after tower reactor section barostat control is tentatively cooled down by two-way heat exchanger 3 first, is cooled down into diluted acid cooler 8, cooling
Enter dilute hydrochloric acid medial launder 9 to 40 DEG C, most of dilute hydrochloric acid is sent VCM purification combination deacidifying devices back to by diluted acid delivery pump 22 and recycled
Absorbing hydrogen chloride, another part dilute hydrochloric acid carry out control through flowmeter and regulating valve by diluted acid charge pump 23 and are sent into dilute hydrochloric acid concentration
Tower 11；
(2) in dilute hydrochloric acid concentration tower 11 under the conditions of certain vacuum degree, the high part of relative volatility in dilute hydrochloric acid
Water vapour is evaporated out tower, and dilute hydrochloric acid concentration tower is concentrated the evaporation of tower reboiler 15 with respect to the barostat control of concentrate and is used as heating medium
It uses, since the dilute hydrochloric acid parsed is continuously replenished in tower top, tower reactor section liquid level is controlled by concentrating acid circulating pump 24, after concentration
Dilute hydrochloric acid sends the cycle parsing of concentrated hydrochloric acid Analytic Tower 4 back to by concentrating acid circulating pump 24；
(3) evaporate dilute hydrochloric acid concentration tower 11 top water vapour and a small amount of hydrogen chloride by steam condenser 12 condense after receive
It combines in waste water medial launder 13, the hydrogen chloride content in waste water is realized by the certain regurgitant volume of 25 control of return of waste water pump, is realized
Process goal concentration waste water sends VCM purification combination deacidifying device circularly absorbing hydrogen chlorides back to by waste water delivery pump 26.
The vacuum degree of dilute hydrochloric acid concentration tower 11 is realized by water-jet pump unit 16.
Parsing tower reboiler 10 makees heat source using 0.5MPa saturated vapors, and concentration tower reboiler 15 uses 0.2~0.25MPa
Saturated vapor makees heat source.For low-pressure saturated steam, relatively rich polyvinyl chloride enterprise is advantageous, and can substantially reduce place
Manage cost.
Claims (10)
1. a kind of VCM purifies hydrochloric acid full stripping device, it is characterised in that：Described device includes concentrated hydrochloric acid resolution system and dilute hydrochloric acid
Vacuum concentration system, the concentrated hydrochloric acid resolution system include the two-way heat exchanger being sequentially connected to, concentrated hydrochloric acid Analytic Tower, level-one chlorination
Deacidifying device is combined in hydrogen cooler, secondary chlorination hydrogen cooler, acid mist separator, the two-way heat exchanger bottom with VCM purifications
It is connected, is connected with concentrated hydrochloric acid Analytic Tower top at the top of two-way heat exchanger, on concentrated hydrochloric acid Analytic Tower lower part and two-way heat exchanger
Portion is connected, and the two-way heat exchanger lower part is connected by diluted acid cooler with diluted acid medial launder, the diluted acid medial launder with
VCM purification combination deacidifying devices are connected；The concentrated hydrochloric acid parsing tower bottom is connected with parsing tower reboiler bottom, Analytic Tower
It is connected with concentrated hydrochloric acid Analytic Tower lower part at the top of reboiler；
The dilute hydrochloric acid vacuum concentration system includes dilute hydrochloric acid concentration tower, steam condenser, waste water medial launder, waste water cooling
Device, the diluted acid medial launder are connected with dilute hydrochloric acid concentration tower, and dilute hydrochloric acid concentrates tower bottom and is connected with concentration tower reboiler bottom
It is logical, it is connected with dilute hydrochloric acid concentration tower lower part at the top of concentration tower reboiler；
The dilute hydrochloric acid concentration tower bottom is connected with concentrated hydrochloric acid Analytic Tower, at the top of dilute hydrochloric acid concentration tower and steam condenser top
Portion is connected, and the steam condenser bottom is connected with waste water medial launder, and the waste water medial launder is not divided into not and dilute hydrochloric acid
Concentration tower, gaseous effluent cooler are connected, and the gaseous effluent cooler combines deacidifying device with VCM purifications and is connected.
2. VCM according to claim 1 purifies hydrochloric acid full stripping device, it is characterised in that：The steam condenser bottom
Portion is connected with water sprays vacuum pump set, and the water sprays vacuum pump set is connected with waste water medial launder；The water injection vacuum
Unit is also connected with tail gas purification tower.
3. VCM according to claim 1 purifies hydrochloric acid full stripping device, it is characterised in that：The level-one hydrogen chloride cooling
Device, secondary chlorination hydrogen cooler, acid mist separator bottom be connected respectively with concentrated hydrochloric acid Analytic Tower top.
4. VCM according to claim 1 purifies hydrochloric acid full stripping device, it is characterised in that：In the parsing tower reboiler
Portion is equipped with the first low-pressure saturated steam import, and parsing tower reboiler lower part is exported equipped with the first steam condensate (SC)；The concentration tower
Reboiler top is equipped with the second low-pressure saturated steam import, and concentration tower reboiler lower part is exported equipped with the second steam condensate (SC).
5. VCM according to claim 1 purifies hydrochloric acid full stripping device, it is characterised in that：The diluted acid medial launder passes through
Diluted acid delivery pump combines deacidifying device with VCM purifications and is connected, and diluted acid medial launder passes through diluted acid charge pump and dilute hydrochloric acid concentration tower
Middle part is connected.
6. VCM according to claim 1 purifies hydrochloric acid full stripping device, it is characterised in that：Dilute hydrochloric acid concentration tower bottom
Portion is connected by concentrating in the middle part of acid circulating pump and concentrated hydrochloric acid Analytic Tower.
7. VCM according to claim 1 purifies hydrochloric acid full stripping device, it is characterised in that：The waste water medial launder passes through
Return of waste water pump is connected with dilute hydrochloric acid concentration tower top, and waste water medial launder passes through waste water delivery pump and phase at the top of gaseous effluent cooler
Connection.
8. a kind of technique of claim 1 described device for VCM purification hydrochloric acid full strippings, it is characterised in that including concentrated hydrochloric acid solution
It analyses section and dilute hydrochloric acid is concentrated in vacuo section, the concentrated hydrochloric acid parsing section includes the following steps：
(1) concentrated hydrochloric acid that combination deacidifying device is purified from VCM first passes around two-way heat exchanger and is discharged from concentrated hydrochloric acid Analytic Tower
High temperature barostat control carry out reverse heat-exchange, using and recovery section thermal energy after be sent into concentrated hydrochloric acid Analytic Tower and handle, in concentrated hydrochloric acid
A part of hydrogen chloride, which is evaporated, to be parsed, intermediate entrainment of saturated vapor, big in gas phase into level-one hydrogen chloride cooler
Part vapor is condensed, and is saturated by the hydrogen chloride in gas phase, forms 35~40% concentrated hydrochloric acids and is back to concentrated hydrochloric acid parsing
Tower carries out the intermediate hydrogen chloride gas of redistillation separation；
(2) enter secondary chlorination hydrogen cooler by tentatively cooling hydrogen chloride and water gaseous mixture, the moisture in gas phase obtain into
One step is condensed and is saturated by the hydrogen chloride in gas phase, is formed 38~42% concentrated hydrochloric acids and is back to concentrated hydrochloric acid Analytic Tower；
(3) hydrogen chloride gas for passing through two-stage cooling low temperature, into acid mist separator, in hydrogen chloride gas cooling procedure because cold
The solidifying acid mist separation generated, hydrogen chloride after processing return to VCM process units；
The dilute hydrochloric acid is concentrated in vacuo section and includes the following steps：
(1) barostat control of concentrated hydrochloric acid Analytic Tower bottom of tower is resolved tower reboiler evaporation and is used as heating medium, and barostat control is first
After tentatively being cooled down by two-way heat exchanger, cooled down into diluted acid cooler, subsequently into dilute hydrochloric acid medial launder, most of dilute hydrochloric acid
By diluted acid conveying pumped back VCM purification combination deacidifying device circularly absorbing hydrogen chlorides, another part dilute hydrochloric acid is by diluted acid charge pump
It is sent into dilute hydrochloric acid concentration tower；
(2) in dilute hydrochloric acid concentration tower under the conditions of certain vacuum degree, the high a part of water vapour of relative volatility in dilute hydrochloric acid
It is evaporated out tower, the dilute hydrochloric acid after concentration sends the cycle parsing of concentrated hydrochloric acid Analytic Tower back to by concentrating acid circulating pump；
(3) evaporate dilute hydrochloric acid concentration tower top water vapour and a small amount of hydrogen chloride condensed by steam condenser after be collected in waste water
In medial launder, the hydrogen chloride content in waste water controls certain regurgitant volume by return of waste water pump and realizes, realizes process goal concentration
Waste water is by waste water conveying pumped back VCM purification combination deacidifying device circularly absorbing hydrogen chlorides.
9. the technique that VCM purifies hydrochloric acid full stripping according to claim 8, it is characterised in that：The vacuum of dilute hydrochloric acid concentration tower
Degree is realized by water-jet pump unit.
10. the technique that VCM purifies hydrochloric acid full stripping according to claim 8, it is characterised in that：Tower reboiler is parsed to use
0.5MPa saturated vapors make heat source, and concentration tower reboiler makees heat source using 0.2~0.25MPa saturated vapors.
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| CN110386591A (en) * | 2019-07-04 | 2019-10-29 | 南通星球石墨设备有限公司 | A kind of waste hydrochloric acid differential pressure regeneration treatment system |
| CN110642228A (en) * | 2019-07-04 | 2020-01-03 | 南通星球石墨设备有限公司 | Calcium carbide-process PVC mercury-containing waste acid treatment system and method for treating waste acid by using same |
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| CN110642228A (en) * | 2019-07-04 | 2020-01-03 | 南通星球石墨设备有限公司 | Calcium carbide-process PVC mercury-containing waste acid treatment system and method for treating waste acid by using same |
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| CN111943141A (en) * | 2020-09-02 | 2020-11-17 | 南通山剑防腐科技有限公司 | Hydrochloric acid analysis device with negative pressure dehydration function and analysis process |
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| CN113041772A (en) * | 2021-03-30 | 2021-06-29 | 夏县运力化工有限公司 | Novel dilute hydrochloric acid rectifying tower |
| CN114653082A (en) * | 2022-03-04 | 2022-06-24 | 酒泉市尚上化工有限公司 | Hydrochloric acid distillation system in pinacolone production process and hydrochloric acid distillation process thereof |
| CN115385303A (en) * | 2022-08-31 | 2022-11-25 | 鲁西化工集团股份有限公司硅化工分公司 | Dilute hydrochloric acid analysis system and process method thereof |
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