CN106315953A - Advanced recycling treatment process and device for waste water generated from synthetic leather production - Google Patents
Advanced recycling treatment process and device for waste water generated from synthetic leather production Download PDFInfo
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- CN106315953A CN106315953A CN201610813054.9A CN201610813054A CN106315953A CN 106315953 A CN106315953 A CN 106315953A CN 201610813054 A CN201610813054 A CN 201610813054A CN 106315953 A CN106315953 A CN 106315953A
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/02—Treatment of water, waste water, or sewage by heating
- C02F1/04—Treatment of water, waste water, or sewage by heating by distillation or evaporation
- C02F1/048—Purification of waste water by evaporation
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/001—Processes for the treatment of water whereby the filtration technique is of importance
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/02—Treatment of water, waste water, or sewage by heating
- C02F1/04—Treatment of water, waste water, or sewage by heating by distillation or evaporation
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- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
- C07C231/00—Preparation of carboxylic acid amides
- C07C231/22—Separation; Purification; Stabilisation; Use of additives
- C07C231/24—Separation; Purification
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2103/00—Nature of the water, waste water, sewage or sludge to be treated
- C02F2103/34—Nature of the water, waste water, sewage or sludge to be treated from industrial activities not provided for in groups C02F2103/12 - C02F2103/32
- C02F2103/36—Nature of the water, waste water, sewage or sludge to be treated from industrial activities not provided for in groups C02F2103/12 - C02F2103/32 from the manufacture of organic compounds
- C02F2103/38—Polymers
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- Life Sciences & Earth Sciences (AREA)
- Hydrology & Water Resources (AREA)
- Engineering & Computer Science (AREA)
- Environmental & Geological Engineering (AREA)
- Water Supply & Treatment (AREA)
- Vaporization, Distillation, Condensation, Sublimation, And Cold Traps (AREA)
Abstract
The invention relates to advanced recycling treatment process and device for waste water generated from synthetic leather production. The advanced recycling treatment process includes the steps of subjecting clear liquid obtained by filtering waste water generated from synthetic leather production to heat exchange with vapor concentrate; partially dehydrating the waste water; subjecting vapor generated from a dehydration and distillation system to dehydration and distillation and then taking the vapor as a heating source for a second reboiler; feeding high-concentration waste water produced from a first reboiler into vaporization system to vaporize and then feeding the vapor into a refine distillation system; pressing distillation residues and filter residues in a pressing system to obtain liquid, returning the liquid obtained by pressing to a filtering system, feeding and drying solid residues in a drying system and then recycling DMF of the residues, feeding gas generated by drying into the refine distillation system and then purifying the gas, and burning or recycling solid residues obtained by drying; feeding the high-concentration waste water from the vaporization system into the refine distillation system, feeding vapor generated by means of distillation and separation into a condensation system and then condensing the vapor, and discharging the high-purity DMF obtained by distillation from the second reboiler. Thus, advanced recycling and utilizing of DMF-containing waste water is achieved.
Description
Technical field
The present invention relates to a kind of waste water advanced recovery processing technique of synthetic leather and device, belong to wastewater from chemical industry recycling
Field.
Background technology
It is colourless transparent liquid under dimethylformamide normal temperature and pressure, is extensively made in wet polyurethane synthetic leather produces
For solvent, can produce substantial amounts of DMF waste water in synthetic leather produces, DMF has hypotoxicity to human body, sucks high concentration DMF energy
Cause acute poisoning.Therefore, DMF waste water is reclaimed, be possible not only to reduce environmental pollution, reduce environmental protection pressure, but also
Production cost can be reduced.
At present, the recovery process of DMF waste water mainly uses rectifying column to separate and recover DMF, but rectification process energy consumption is high, rectification
Time is long, and DMF easily decomposes.In face of energy-saving square, people has carried out many work, but in DMF waste water in addition to water and DMF, also
Containing mechanical admixtures such as the powdered seasonings such as colorant, wood powder, calcium carbonate and cloth hairs, these impurity will form rectification in distillation process
Residue, and rectification residue falls within danger wastes, the most still contains the DMF of 20 ~ 40%, not only needs to carry out offal treatment,
Also there is recycling be worth.Patent CN200510061857.5 and CN201310304564.X disclose a kind of waste water Han DMF
Multi-effect distillation recovery method, although these methods can save the recovery energy consumption of DMF waste water, but the most only considers DMF in waste water
Recovery, and do not consider DMF rectification residue the degree of depth reclaim problem.And equipment is many in multi-effect distillation, material is in a device
The time of staying long, DMF decompose probability improve；Flow process is complicated, and whole technological process is difficult to operate control；Between each effect rectifying column
The temperature difference is little makes heat-transfer equipment need bigger heat transfer area, and equipment investment is big.Patent CN201310001454.6 discloses one
Plant chemical leather DMF and reclaim residue treatment technique and system, use evaporation boiler to reclaim the DMF in residue, but height glues in evaporation boiler
The residue of degree relies on single agitator to cannot be carried out thermally equivalent, and its heat-transfer effect and drying effect are far away from rake type dryer；
And directly bottoms are evaporated, wherein containing substantial amounts of moisture, Slag recovering process energy consumption is high.
Summary of the invention
The present invention is directed to the deficiency of existing DMF waste water reclamation technology, it is provided that a kind of synthetic leather waste water advanced recycling work
Skill and device, complete the recovery of DMF in DMF waste water and DMF rectification residue, it is achieved waste water is organic with waste residue recovery processing technique
Coupling, reaches the purpose of the waste water advanced recycling of DMF.
Technical program of the present invention lies in: a kind of waste water advanced recovery processing technique of synthetic leather, refine rectification including by DMF
The degree of depth recycling dress of system, DMF dehydration distillation system, vapo(u)rization system, filtration system, squeezing system and drying system composition
Putting, step is as follows:
1) the DMF waste water produced by synthetic leather clear liquid after filtration system filters refines in distillation system with being arranged at DMF
The steam condensate of the second reboiler heating carries out heat exchange, delivers into DMF dehydration essence after the preheating of DMF waste water in liquid form
Evaporate system；
2) in atmospheric conditions, DMF waste water carries out the water of rectification separation removal part in DMF dehydration distillation system, after dehydration
The DMF waste water of higher concentration is by the first reboiler extraction being arranged in DMF dehydration distillation system, and enters vapo(u)rization system；DMF
The water vapour that dehydration distillation system produces boils as second after the dehydration rectifying section dehydration rectification in DMF dehydration distillation system again
The heat source of device, the condensed condensed fluid of water vapour be partly refluxed to be dehydrated rectifying section, another part then with come inherent filtration system
The DMF waste water of system carries out extraction after heat exchange, as the recycle-water of synthetic leather production process；
3) entered vapo(u)rization system by the high concentration DMF waste water of the first reboiler extraction, after being vaporized, enter DMF in gaseous form
Refined distillation system；The filtering residue that the DMF rectification residue of vapo(u)rization system remnants then produces with filtration system enters squeezing system squeezing,
Liquid after squeezing returns filtration system, and solid slag then enters the DMF in drying system dried recovered residue, is dried the gas produced
The most then entering DMF with gas phase and refine distillation system purification, the solid residue being dried to obtain then carries out burning or resource
Utilize；
4) the high concentration DMF waste water from vapo(u)rization system enters DMF and refines distillation system, is separated the water vapour produced by rectification
Being passed through and be arranged in the condenser system that DMF refines in distillation system condensation, water vapour condensed condensed fluid partial reflux is to setting
It is placed in the refined rectifying section that DMF refines in distillation system, the recycle-water that another part extraction produces as synthetic leather；And rectification
High-purity DMF obtained extraction in the second reboiler.
Further, described DMF refines distillation system, DMF dehydration distillation system is respectively cross_flow rotating packed bed, fills out
Material is granular pattern or structured packing, and number of theoretical plate is 10 ~ 35.
Further, described vapo(u)rization system is central circulation type or scraper-type vaporizer；Described squeezing system is spiral pressure
Crusher；Drying system is rake type dryer.
Further, the operation pressure of described DMF dehydration distillation system is normal pressure, described vapo(u)rization system and the refined essence of DMF
The operation pressure evaporating system is 5 ~ 10kPa, and the operation pressure of described drying system is 5kPa；The operation temperature of package unit is 80
~110℃。
Further, the opposing steam flow produced in described first reboiler is de-to be arranged in DMF dehydration distillation system
Water stripping section, the high concentration DMF waste water from vapo(u)rization system enters DMF with gas phase and refines distillation system.
A kind of waste water advanced recycling of synthetic leather being applied to the above-mentioned waste water advanced recovery processing technique of a kind of synthetic leather
Device, including filtration system, described filtration system connects through heat-exchange system has DMF to be dehydrated distillation system, and described DMF is dehydrated rectification
Being provided with the first reboiler in system, the high concentration DMF waste water production end of described first reboiler connects vapo(u)rization system, institute
The filtering residue outfan of the rectification residue outfan and filtration system of stating vapo(u)rization system is connected with a squeezing system respectively, described pressure
The fluid output port of squeezing system leads to filtration system, and solid slag outfan and a drying system of squeezing system are connected, described
The gas phase outlet of drying system and a DMF refine distillation system and are connected, the gas output end of described vapo(u)rization system and DMF essence
Distillation system processed is connected, and described DMF is dehydrated the water vapour outfan of rectification system and refines essence as heat source with being arranged at DMF
The second reboiler evaporated in system is connected, and the heating steam condensate outfan of described second reboiler is connected with heat-exchange system
Connecing, described DMF refines and is additionally provided with condenser system on distillation system.
Further, described DMF dehydration distillation system include be dehydrated rectifying section and dehydration stripping section, described heat-exchange system with
Dehydration stripping section is connected, and the high concentration DMF waste water outfan of described dehydration stripping section and the first reboiler are connected, and described the
The gas output end of one reboiler leads to dehydration stripping section, and the steam output end of described dehydration stripping section is connected with dehydration rectifying section
Connect, described dehydration rectifying section is provided with and is dehydrated the DMF return of waste water end that stripping section is connected, the water vapour of dehydration stripping section
Outfan and the second reboiler are connected.
Further, described DMF refines distillation system and includes refined rectifying section and refined stripping section, described vapo(u)rization system
Gas output end leads to refined rectifying section, and the steam output end of described refined rectifying section is connected with condenser system, described condensation
It is provided with the condensed fluid outfan leading to refined rectifying section in system, described refined rectifying section is additionally provided with and refines stripping section
The high concentration DMF waste water outfan being connected, the steam rectification end of described refined stripping section is connected with refined rectifying section, refined
The high-purity DMF waste water outfan of stripping section and the second reboiler are connected, and described second reboiler is provided with high-purity DMF
Production end and the DMF waste water stripping end being connected with refined stripping section.
Further, described heat-exchange system is feed preheater, the gas phase outlet of described drying system and refined stripping
Section is connected.
Further, described DMF refines distillation system, DMF dehydration distillation system is respectively cross_flow rotating packed bed, fills out
Material is granular pattern or structured packing, and number of theoretical plate is 10 ~ 35；Described vapo(u)rization system is central circulation type or scraper-type vaporizer；
Described squeezing system is pressafiner；Drying system is rake type dryer.
Compared with prior art, the invention have the advantages that the present invention returning DMF waste water and DMF rectification residue
Receipts process organic coupling, it is achieved that the degree of depth of DMF waste water reclaims, and in waste water, the response rate of DMF can reach more than 99%, in residue
DMF recovery rate can reach 95%；Use cross_flow rotating packed bed to complete dehydration and the refining spearation of waste water, be reduced significantly point
From equipment, reduce the waste water time of staying in a device, effectively reduce the decomposition of DMF；Utilize Technology in Pressing residual to rectification
Slag be dried before pretreatment, remove the most substantial amounts of moisture, reduce residue dry run energy consumption.
Accompanying drawing explanation
Fig. 1 is the structural representation of the present invention；
In figure: T1-dehydration rectifying section T11-water vapour outfan T12-DMF return of waste water end T2-is dehydrated stripping section T21-
High concentration DMF waste water outfan T22-steam output end T3-refines rectifying section T31-steam output end T32-high concentration DMF
Waste water outfan T4-refines stripping section T41-steam rectification end T42-high-purity DMF waste water outfan T5-squeezing system
T51-fluid output port T52-solid slag outfan E1-the first reboiler E11-high concentration DMF waste water production end E12-gas
Body outfan E2-the second reboiler E21-vapours condensed fluid outfan E22-high-purity DMF production end E23-DMF waste water
Stripping end E3-heat-exchange system E4-condenser system E41-condensed fluid outfan V1-vapo(u)rization system V11-rectification residue exports
End V12-gas output end D1-drying system D11-gas phase outlet F1-filtration system F11-filtering residue outfan.
Detailed description of the invention
For the features described above of the present invention and advantage can be become apparent, special embodiment below, and coordinate accompanying drawing, make in detail
Carefully it is described as follows, but the present invention is not limited to this.
With reference to Fig. 1
A kind of waste water advanced recovery processing technique of synthetic leather, including being refined distillation system by DMF, DMF is dehydrated distillation system, evaporation
System, filtration system, squeezing system and the degree of depth recycling and processing device of drying system composition, step is as follows:
1) the DMF waste water produced by synthetic leather clear liquid after filtration system F1 filters refines distillation system (T3 with being arranged at DMF
And T4) in the steam condensate of the second reboiler E2 heating carry out heat exchange, be delivered in liquid form after the preheating of DMF waste water
Enter DMF dehydration distillation system (T1 and T2)；
2) under the conditions of 1atm pressure, reflux ratio 0.5 ~ 1.5, DMF waste water carries out essence in DMF is dehydrated distillation system (T1 and T2)
Evaporating the water of separation removal part, after dehydration, the DMF waste water of higher concentration is boiled by first be arranged in DMF dehydration distillation system again
Device E1 extraction, and enter vapo(u)rization system V1；The water vapour that DMF dehydration distillation system (T1 and T2) produces is dehydrated rectification system through DMF
As the heat source of the second reboiler E2, water vapour condensed condensed fluid portion after dehydration rectifying section T1 dehydration rectification in system
Dividing and be back to be dehydrated rectifying section T1, another part condensed fluid is adopted after then carrying out heat exchange with the DMF waste water from filtration system F1
Go out, as the recycle-water of synthetic leather production process；
3) entered decompression operation by the high concentration DMF waste water of the first reboiler E1 extraction and pressure is the vapo(u)rization system of 5 ~ 10kPa
V1, enters DMF in gaseous form and refines distillation system (T3 and T4) after being vaporized；The DMF rectification of vapo(u)rization system V1 remnants is residual
The filtering residue that slag then produces with filtration system F1 enters squeezing system T5 squeezing, and the liquid after squeezing returns filtration system F1, solid
Slag then enters the DMF in drying under reduced pressure system D1 dried recovered residue, be dried produce gas phase then with gas phase through micro-pressurization
Entering DMF and refine distillation system (T3 and T4) purification, the solid residue being dried to obtain then carries out burning or recycling；
4) the high concentration DMF waste water (gas phase) from vapo(u)rization system V1 enters DMF and refines distillation system (T3 and T4), passes through
Rectification separate produce water vapour be passed through be arranged at DMF refine in condenser system E4 in distillation system (T3 and T4) condense, water
Steam condensed condensed fluid partial reflux to being arranged in the refined rectifying section T3 that DMF refines in distillation system (T3 and T4),
The recycle-water that another part extraction produces as synthetic leather；And high-purity DMF that rectification obtains extraction in the second reboiler E2.
In the present embodiment, described DMF refines distillation system, DMF dehydration distillation system is respectively cross_flow rotating packed bed,
Filler is granular pattern or structured packing, and number of theoretical plate is 10 ~ 35.
In the present embodiment, described vapo(u)rization system V1 is central circulation type or scraper-type vaporizer；Described squeezing system T5 is
Pressafiner；Drying system D1 is rake type dryer, and described condenser system is condenser.
In the present embodiment, the operation pressure of described DMF dehydration distillation system is normal pressure, described vapo(u)rization system V1 and DMF essence
The operation pressure of distillation system processed is 5 ~ 10kPa, and reflux ratio is 1 ~ 2, and the operation pressure of described drying system D1 is 5kPa；A whole set of
The operation temperature of device is 80 ~ 110 DEG C.
In the present embodiment, the opposing steam flow produced in described first reboiler E1 is to being arranged in DMF dehydration distillation system
Dehydration stripping section T2, from vapo(u)rization system V1 high concentration DMF waste water with gas phase enter DMF refine distillation system.
Concrete, quality group becomes the DMF waste water of 20%, first, is filtered by filtration system, and clear liquid hypergravity refines
The reboiler heating steam condensate preheating of distillation system, delivers into DMF and is dehydrated distillation system after the preheating of DMF waste water, overweight
The number of theoretical plate of power packed bed T1 is 15 pieces, the number of theoretical plate of hypergravity packed bed T2 is 5 pieces, dehydration distillation system operation pressure
For 1atm, reflux ratio 1.0, DMF waste strength, through dehydration distillation system, is improved to 50% by DMF waste water by 20%.Then, extraction
High concentration DMF waste water enter pressure be the vapo(u)rization system of 8kPa, the gas after vaporization delivers into DMF and refines distillation system,
Wherein the number of theoretical plate of hypergravity packed bed T3 and T4 is respectively 20 and 10, and the pressure of refined distillation system is 2kPa, reflux ratio
Being 1.0, rectification separates the recycle-water that the water produced produces as synthetic leather, and the DMF purity that rectification obtains is 99.8%, the response rate
99.2%.DMF rectification residue and the filtering residue of filtration system generation that vapo(u)rization system is remaining then enter squeezer squeezing, after squeezing
Liquid returns filtration system, DMF content be 35% solid residue to deliver into operation pressure be that the vacuum of 5kPa turns rake exsiccator
DMF in dried recovered residue, is dried the gas phase entrance DMF produced and refines distillation system purification, the solid residue being dried to obtain
Then carry out burning or recycling.
With reference to Fig. 1
A kind of waste water advanced recycling and processing device of synthetic leather being applied to the above-mentioned waste water advanced recovery processing technique of a kind of synthetic leather,
Including filtration system F1, described filtration system F1 connects DMF through heat-exchange system E3 and is dehydrated distillation system, and described DMF is dehydrated rectification
It is provided with connection on the high concentration DMF waste water production end E11 of the first reboiler E1, described first reboiler E1 in system and has evaporation
System V1, the rectification residue outfan V11 of described vapo(u)rization system V1 and the filtering residue outfan F11 of filtration system F1 press with one respectively
Squeezing system T5 is connected, and the fluid output port T51 of described squeezing system T5 leads to filtration system F1, the solid slag of squeezing system T5
An outfan T52 and drying system D1 is connected, and the gas phase outlet D11 and a DMF of described drying system D1 refine rectification system
System is connected, and gas output end V12 with DMF of described vapo(u)rization system V1 refines distillation system and be connected, and described DMF is dehydrated rectification
The water vapour outfan T11 of system is connected with being arranged at the second reboiler E2 that DMF refines in distillation system as heat source
Connecing, the heating steam condensate outfan E21 of described second reboiler E2 is connected with heat-exchange system E3, and water vapour is condensed
Condensed fluid is partly refluxed to be dehydrated rectifying section T1, and another part condensed fluid then carries out heat with the DMF waste water from filtration system F1
Extraction after exchange, as the recycle-water of synthetic leather production process；Described DMF refines and is additionally provided with condenser system on distillation system
E4, described condenser system is provided with condensed fluid outfan E41, and condensed fluid partial reflux refines distillation system (T3 to being arranged at DMF
And T4) in refined rectifying section T3 in, the recycle-water that another part extraction produces as synthetic leather.
In the present embodiment, described DMF dehydration distillation system includes being dehydrated rectifying section T1 and dehydration stripping section T2, described heat exchange
System E3 is connected with dehydration stripping section T2, and the high concentration DMF waste water outfan T21 and first of described dehydration stripping section T2 boils again
Device E1 is connected, and the gas output end E12 of described first reboiler E1 leads to dehydration stripping section T2, described dehydration stripping section T2's
Steam output end T22 is connected with dehydration rectifying section T1, described dehydration rectifying section T1 is provided with and is dehydrated stripping section T2 and is connected
The DMF return of waste water end T12 connect, the water vapour outfan T11 and the second reboiler E2 of dehydration rectifying section T1 are connected.
In the present embodiment, described DMF refines distillation system and includes refined rectifying section T3 and refined stripping section T4, described evaporation
The gas output end V12 of system V1 leads to refined rectifying section T3, the steam output end T31 of described refined rectifying section T3 and condensed system
System E4 is connected, and described condenser system E4 is provided with condensed fluid outfan E41, and an outlet of condensed fluid outfan is led to refined
Rectifying section T3, the recycle-water collecting tank that synthetic leather produces, described refined rectifying section T3 are led in another outlet of condensed fluid outfan
On be additionally provided with and refine the high concentration DMF waste water outfan T32 that stripping section T4 is connected, the steam of described refined stripping section T4
Rectification end T41 is connected with refined rectifying section T3, and the high-purity DMF waste water outfan T42 and second of refined stripping section T4 boils again
Device E2 is connected, and described second reboiler E2 is provided with high-purity DMF production end E22 and is connected with refined stripping section T4
DMF waste water stripping end E23.
In the present embodiment, described heat-exchange system E3 is feed preheater, the gas phase outlet D11 of described drying system D1 with
Refined stripping section T4 is connected.
In the present embodiment, described DMF refines distillation system, DMF dehydration distillation system is respectively cross_flow rotating packed bed,
Filler is granular pattern or structured packing, and number of theoretical plate is 10 ~ 35；Described vapo(u)rization system V1 is central circulation type or scraper-type evaporation
Device；Described squeezing system T5 is pressafiner；Drying system D1 is rake type dryer.
The foregoing is only presently preferred embodiments of the present invention, for the ordinary skill in the art, according to this
Bright teaching, the waste water advanced recovery processing technique of synthetic leather and the device of designing multi-form are not required to creative labor
Dynamic, the most all equalizations done according to scope of the present invention patent change, repair
Change, replace and modification, all should belong to the covering scope of the present invention.
Claims (10)
1. the waste water advanced recovery processing technique of synthetic leather, including being refined distillation system by DMF, DMF is dehydrated distillation system, steaming
The system of sending out, filtration system, squeezing system and the degree of depth recycling and processing device of drying system composition, it is characterised in that step is as follows:
1) the DMF waste water produced by synthetic leather clear liquid after filtration system filters refines in distillation system with being arranged at DMF
The steam condensate of the second reboiler heating carries out heat exchange, delivers into DMF dehydration essence after the preheating of DMF waste water in liquid form
Evaporate system；
2) in atmospheric conditions, DMF waste water carries out the water of rectification separation removal part in DMF dehydration distillation system, after dehydration
The DMF waste water of higher concentration is by the first reboiler extraction being arranged in DMF dehydration distillation system, and enters vapo(u)rization system；DMF
The water vapour that dehydration distillation system produces boils as second after the dehydration rectifying section dehydration rectification in DMF dehydration distillation system again
The heat source of device, the condensed condensed fluid of water vapour be partly refluxed to be dehydrated rectifying section, another part then with come inherent filtration system
The DMF waste water of system carries out extraction after heat exchange, as the recycle-water of synthetic leather production process；
3) entered vapo(u)rization system by the high concentration DMF waste water of the first reboiler extraction, after being vaporized, enter DMF in gaseous form
Refined distillation system；The filtering residue that the DMF rectification residue of vapo(u)rization system remnants then produces with filtration system enters squeezing system squeezing,
Liquid after squeezing returns filtration system, and solid slag then enters the DMF in drying system dried recovered residue, is dried the gas produced
The most then entering DMF with gas phase and refine distillation system purification, the solid residue being dried to obtain then carries out burning or resource
Utilize；
4) the high concentration DMF waste water from vapo(u)rization system enters DMF and refines distillation system, is separated the water vapour produced by rectification
Being passed through and be arranged in the condenser system that DMF refines in distillation system condensation, water vapour condensed condensed fluid partial reflux is to setting
It is placed in the refined rectifying section that DMF refines in distillation system, the recycle-water that another part extraction produces as synthetic leather；And rectification
High-purity DMF obtained extraction in the second reboiler.
A kind of waste water advanced recovery processing technique of synthetic leather the most according to claim 1, it is characterised in that described DMF essence
Distillation system processed, DMF dehydration distillation system is respectively cross_flow rotating packed bed, and filler is granular pattern or structured packing, theoretical
Plate number is 10 ~ 35.
A kind of waste water advanced recovery processing technique of synthetic leather the most according to claim 1, it is characterised in that described evaporation system
System is central circulation type or scraper-type vaporizer；Described squeezing system is pressafiner；Drying system is rake type dryer.
A kind of waste water advanced recovery processing technique of synthetic leather the most according to claim 1, it is characterised in that described DMF takes off
The operation pressure of water distillation system is normal pressure, and it is 5 ~ 10kPa that described vapo(u)rization system and DMF refine the operation pressure of distillation system,
The operation pressure of described drying system is 5kPa；The operation temperature of package unit is 80 ~ 110 DEG C.
A kind of waste water advanced recovery processing technique of synthetic leather the most according to claim 1, it is characterised in that described first again
The opposing steam flow produced in boiling device is to the dehydration stripping section being arranged in DMF dehydration distillation system, highly concentrated from vapo(u)rization system
Degree DMF waste water enters DMF with gas phase and refines distillation system.
6. the waste water advanced recycling and processing device of synthetic leather, including filtration system, it is characterised in that described filtration system is through changing
Hot systems connects has DMF to be dehydrated distillation system, and described DMF dehydration distillation system is provided with the first reboiler, and described first again
Connect on the high concentration DMF waste water production end of boiling device and have vapo(u)rization system, the rectification residue outfan of described vapo(u)rization system and filtration
The filtering residue outfan of system is connected with a squeezing system respectively, and the fluid output port of described squeezing system leads to filtration system,
Solid slag outfan and a drying system of squeezing system are connected, and the gas phase outlet of described drying system and a DMF refine
Distillation system is connected, and the gas output end of described vapo(u)rization system refines distillation system with DMF and is connected, and described DMF is dehydrated essence
Evaporate the water vapour outfan that is to be connected with being arranged at the second reboiler that DMF refines in distillation system as heat source, institute
The heating steam condensate outfan stating the second reboiler is connected with heat-exchange system, and described DMF refines and also sets on distillation system
It is equipped with condenser system.
A kind of waste water advanced recycling and processing device of synthetic leather the most according to claim 6, it is characterised in that described DMF takes off
Water distillation system includes being dehydrated rectifying section and dehydration stripping section, and described heat-exchange system is connected with dehydration stripping section, described dehydration
The high concentration DMF waste water outfan of stripping section and the first reboiler are connected, and the gas output end of described first reboiler leads to
Dehydration stripping section, the steam output end of described dehydration stripping section is connected with dehydration rectifying section, described dehydration rectifying section is arranged
Having the DMF return of waste water end being connected with dehydration stripping section, water vapour outfan and second reboiler of dehydration rectifying section are connected
Connect.
8. according to the waste water advanced recycling and processing device of a kind of synthetic leather described in claim 6 or 7, it is characterised in that described DMF
Refined distillation system includes refined rectifying section and refined stripping section, and the gas output end of described vapo(u)rization system leads to refined rectification
Section, the steam output end of described refined rectifying section is connected with condenser system, described condenser system is provided with and leads to refined essence
The condensed fluid outfan of the section of evaporating, described refined rectifying section is additionally provided with and refines the high concentration DMF waste water that stripping section is connected
Outfan, the steam rectification end of described refined stripping section is connected with refined rectifying section, the high-purity DMF waste water of refined stripping section
Outfan and the second reboiler are connected, described second reboiler is provided with high-purity DMF production end and with refined stripping
The DMF waste water stripping end that section is connected.
A kind of waste water advanced recycling and processing device of synthetic leather the most according to claim 8, it is characterised in that described heat exchange system
System is feed preheater, and the gas phase outlet of described drying system is connected with refined stripping section.
10. according to the waste water advanced recycling and processing device of a kind of synthetic leather described in claim 6 or 9, it is characterised in that described
DMF refines distillation system, DMF dehydration distillation system is respectively cross_flow rotating packed bed, and filler is granular pattern or structured packing,
Number of theoretical plate is 10 ~ 35；Described vapo(u)rization system is central circulation type or scraper-type vaporizer；Described squeezing system is screw press
Machine；Drying system is rake type dryer.
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| CN106832394A (en) * | 2017-04-06 | 2017-06-13 | 浙江丰望环保有限公司 | Slurry recoverying and utilizing method is discarded in a kind of synthetic leather production |
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| CN106315953B (en) | 2019-03-12 |
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