CN104492783A - Reutilizationoun method for synthetic leather rectification residue - Google Patents
Reutilizationoun method for synthetic leather rectification residue Download PDFInfo
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- CN104492783A CN104492783A CN201410601895.4A CN201410601895A CN104492783A CN 104492783 A CN104492783 A CN 104492783A CN 201410601895 A CN201410601895 A CN 201410601895A CN 104492783 A CN104492783 A CN 104492783A
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- rectification residue
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- synthetic leather
- liquid phase
- rectification
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- 238000000034 method Methods 0.000 title claims abstract description 46
- 239000002649 leather substitute Substances 0.000 title claims abstract description 32
- ZMXDDKWLCZADIW-UHFFFAOYSA-N N,N-Dimethylformamide Chemical compound CN(C)C=O ZMXDDKWLCZADIW-UHFFFAOYSA-N 0.000 claims abstract description 75
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 25
- 239000007791 liquid phase Substances 0.000 claims abstract description 24
- 239000007790 solid phase Substances 0.000 claims abstract description 15
- 238000003756 stirring Methods 0.000 claims abstract description 12
- QAOWNCQODCNURD-UHFFFAOYSA-N Sulfuric acid Chemical compound OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 claims abstract description 8
- 239000012670 alkaline solution Substances 0.000 claims abstract description 8
- VSCWAEJMTAWNJL-UHFFFAOYSA-K aluminium trichloride Chemical compound Cl[Al](Cl)Cl VSCWAEJMTAWNJL-UHFFFAOYSA-K 0.000 claims abstract description 8
- 239000000725 suspension Substances 0.000 claims abstract description 8
- 238000012545 processing Methods 0.000 claims abstract description 7
- 239000000843 powder Substances 0.000 claims abstract description 5
- 238000000746 purification Methods 0.000 claims abstract description 4
- 239000000243 solution Substances 0.000 claims abstract description 4
- 239000007788 liquid Substances 0.000 claims description 15
- 238000004064 recycling Methods 0.000 claims description 8
- 239000002893 slag Substances 0.000 claims description 7
- 150000001768 cations Chemical class 0.000 claims description 6
- 229920002521 macromolecule Polymers 0.000 claims description 6
- 230000018044 dehydration Effects 0.000 claims description 4
- 238000006297 dehydration reaction Methods 0.000 claims description 4
- OYPRJOBELJOOCE-UHFFFAOYSA-N Calcium Chemical compound [Ca] OYPRJOBELJOOCE-UHFFFAOYSA-N 0.000 claims description 3
- 235000008733 Citrus aurantifolia Nutrition 0.000 claims description 3
- 235000011941 Tilia x europaea Nutrition 0.000 claims description 3
- 239000011449 brick Substances 0.000 claims description 3
- 229910052791 calcium Inorganic materials 0.000 claims description 3
- 239000011575 calcium Substances 0.000 claims description 3
- 239000010881 fly ash Substances 0.000 claims description 3
- 239000004571 lime Substances 0.000 claims description 3
- 238000002156 mixing Methods 0.000 claims description 3
- 229920002401 polyacrylamide Polymers 0.000 claims description 3
- 239000013049 sediment Substances 0.000 claims description 3
- 239000012071 phase Substances 0.000 claims 2
- 230000008901 benefit Effects 0.000 abstract description 7
- 238000005406 washing Methods 0.000 abstract description 2
- ODINCKMPIJJUCX-UHFFFAOYSA-N Calcium oxide Chemical compound [Ca]=O ODINCKMPIJJUCX-UHFFFAOYSA-N 0.000 abstract 2
- 235000012255 calcium oxide Nutrition 0.000 abstract 1
- 239000000292 calcium oxide Substances 0.000 abstract 1
- 125000002091 cationic group Chemical group 0.000 abstract 1
- 238000001914 filtration Methods 0.000 abstract 1
- 239000008394 flocculating agent Substances 0.000 abstract 1
- 238000000265 homogenisation Methods 0.000 abstract 1
- 239000002244 precipitate Substances 0.000 abstract 1
- 239000002699 waste material Substances 0.000 description 16
- 238000004519 manufacturing process Methods 0.000 description 15
- 239000000126 substance Substances 0.000 description 6
- 230000007613 environmental effect Effects 0.000 description 5
- 238000005516 engineering process Methods 0.000 description 4
- BDAGIHXWWSANSR-UHFFFAOYSA-N methanoic acid Natural products OC=O BDAGIHXWWSANSR-UHFFFAOYSA-N 0.000 description 4
- 239000002910 solid waste Substances 0.000 description 4
- 239000003245 coal Substances 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 239000003344 environmental pollutant Substances 0.000 description 3
- 239000000463 material Substances 0.000 description 3
- 231100000719 pollutant Toxicity 0.000 description 3
- 239000002912 waste gas Substances 0.000 description 3
- 239000002351 wastewater Substances 0.000 description 3
- OSWFIVFLDKOXQC-UHFFFAOYSA-N 4-(3-methoxyphenyl)aniline Chemical compound COC1=CC=CC(C=2C=CC(N)=CC=2)=C1 OSWFIVFLDKOXQC-UHFFFAOYSA-N 0.000 description 2
- 241000196324 Embryophyta Species 0.000 description 2
- 208000027418 Wounds and injury Diseases 0.000 description 2
- 239000002585 base Substances 0.000 description 2
- 230000015556 catabolic process Effects 0.000 description 2
- 238000004939 coking Methods 0.000 description 2
- 230000006378 damage Effects 0.000 description 2
- 235000019253 formic acid Nutrition 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 229920005749 polyurethane resin Polymers 0.000 description 2
- 238000004062 sedimentation Methods 0.000 description 2
- 238000000926 separation method Methods 0.000 description 2
- 230000001954 sterilising effect Effects 0.000 description 2
- 238000004659 sterilization and disinfection Methods 0.000 description 2
- 241000251468 Actinopterygii Species 0.000 description 1
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- 235000002918 Fraxinus excelsior Nutrition 0.000 description 1
- 241000233866 Fungi Species 0.000 description 1
- 241000276489 Merlangius merlangus Species 0.000 description 1
- 241001465754 Metazoa Species 0.000 description 1
- 240000001307 Myosotis scorpioides Species 0.000 description 1
- 230000002378 acidificating effect Effects 0.000 description 1
- 239000003513 alkali Substances 0.000 description 1
- 239000002956 ash Substances 0.000 description 1
- 244000052616 bacterial pathogen Species 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000037237 body shape Effects 0.000 description 1
- 150000001669 calcium Chemical class 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 239000003183 carcinogenic agent Substances 0.000 description 1
- 239000004568 cement Substances 0.000 description 1
- 239000000084 colloidal system Substances 0.000 description 1
- 238000002485 combustion reaction Methods 0.000 description 1
- 238000011109 contamination Methods 0.000 description 1
- 230000001351 cycling effect Effects 0.000 description 1
- 230000002354 daily effect Effects 0.000 description 1
- 238000000354 decomposition reaction Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000000593 degrading effect Effects 0.000 description 1
- 230000001877 deodorizing effect Effects 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 238000004821 distillation Methods 0.000 description 1
- 238000001035 drying Methods 0.000 description 1
- 238000004945 emulsification Methods 0.000 description 1
- DNJIEGIFACGWOD-UHFFFAOYSA-N ethanethiol Chemical compound CCS DNJIEGIFACGWOD-UHFFFAOYSA-N 0.000 description 1
- 230000003203 everyday effect Effects 0.000 description 1
- 239000004744 fabric Substances 0.000 description 1
- 239000000945 filler Substances 0.000 description 1
- 239000007789 gas Substances 0.000 description 1
- 238000009776 industrial production Methods 0.000 description 1
- 208000014674 injury Diseases 0.000 description 1
- 210000000936 intestine Anatomy 0.000 description 1
- 239000002563 ionic surfactant Substances 0.000 description 1
- 239000010985 leather Substances 0.000 description 1
- 229920005610 lignin Polymers 0.000 description 1
- 210000004072 lung Anatomy 0.000 description 1
- 238000006386 neutralization reaction Methods 0.000 description 1
- 230000001473 noxious effect Effects 0.000 description 1
- 239000003960 organic solvent Substances 0.000 description 1
- 230000000505 pernicious effect Effects 0.000 description 1
- 238000012958 reprocessing Methods 0.000 description 1
- 239000000779 smoke Substances 0.000 description 1
- 238000007711 solidification Methods 0.000 description 1
- 230000008023 solidification Effects 0.000 description 1
- 239000007921 spray Substances 0.000 description 1
- 210000002784 stomach Anatomy 0.000 description 1
- 230000001988 toxicity Effects 0.000 description 1
- 231100000419 toxicity Toxicity 0.000 description 1
- 230000010148 water-pollination Effects 0.000 description 1
- 239000002023 wood Substances 0.000 description 1
Landscapes
- Processing Of Solid Wastes (AREA)
- Separation Of Suspended Particles By Flocculating Agents (AREA)
- Treatment And Processing Of Natural Fur Or Leather (AREA)
Abstract
A related reutilizationoun method for synthetic leather rectification residue comprises the following steps: putting rectification residue in a reaction tank, adding clear water and stirring uniformly, so as to fully dissolve dimethyl formamide in the rectification residue in water; adding an alkaline solution and performing water washing; stirring and enabling the rectification residue to be decomposed into a suspension of residue and water, and then adding a sulfuric acid solution for homogenization reaction; then adding aluminium chloride and a high-molecular cationic flocculating agent and stirring, so as to enable the suspended residue to form a precipitate and realize layering of the solid phase and the liquid phase; performing purification and concentration on the layered liquid phase, enabling the concentration of dimethyl formamide in the liquid phase to reach 20-30%, and performing rectification on the liquid phase; and adding quicklime powder into the layered solid phase, performing dewatering processing by a belt type press-filtration dewaterer, and preparing a mud cake from the dewatered solid phase. The method has multiple advantages such as low processing cost, capability of respectively reutilizing the separated liquid phase and solid phase, energy saving, environment friendliness and the like.
Description
[technical field]
The present invention relates to a kind of method of disposal of industrial residue, be specifically related to a kind of synthetic leather rectification residue reuse method, belong to environmental technology field.
[background technology]
The prodution and development of synthetic leather plays extremely important effect in its industry development process, and it instead of the specific effect of most natural leather, is the daily productive life of the mankind, and industrial production and other field provide unlimited convenient.China has now become that world synthetic leather is produced, processing all, have thousands of production lines and process equipment.Produce and process and create huge Social benefit and economic benefit, in the process of industry development, produce the pollution problem that the produced three wastes (waste gas, waste water, waste residue) cause also be on the rise, the rectification residue about 300 kilograms that every bar production line produces every day simultaneously.Therefore these problems now progressively cause showing great attention to of leaders government and environmentalist.
Synthetic leather produce in waste gas and wastewater problem, through the joint efforts of leaders government, each scientific research department and each manufacturing enterprise, now obtained and effectively administered.By the recycling and administration to waste gas, waste water, not only solved the pollution problem of ecological environment, but also obtained good economic benefit from recycling and administration process.
Waste residue problem in synthetic leather production process, the especially disposal of rectification residue, up to the present remain an environmental protection subject urgently to be resolved hurrily.Because on the one hand rectification residue is through high temperature distillation operation, there occurs sex change in the process that the refuse of some organic and inorganic nature is reclaimed in rectifying, variation, emulsification, coking define a kind of oily waste kesiduum of colloid cement paste.Dimethyl formamide (being called for short DMF) on the other hand also containing the 30-40% that has an appointment in this oily waste kesiduum, can recycle.Thus this residue is done to innoxious process for treating difficulty is large, complex disposal process.
Otherwise, if do not processed this residue, its harmfulness will be difficult to the imagination more, because the main component of rectification residue has: formic acid, dimethyl formamide, polyurethane resin, mill base, ionic surfactant, relevant auxiliary chemicals and organic solvent, lignin, coarse whiting, ashes and Bu Mao etc., these are all serious pollution sources, have greatly injure environment, ecology and the person, and pollution level is lifelong, expendable.Rectification residue can cause on ground that Chinese caterpillar fungus is raw, plant is withered and yellow, distributes excitant stench and can grow a large amount of germs, toxicity, carcinogenic substance, has great injury to the stomach of human body, lung, intestines.Rectification residue with self power polluted water region of several thousand times, can cause raw plant, animal, fish absolutely fatal wound under water in water.Therefore, the rectification residue in synthetic leather production is classified as dangerous class solid waste by national environmental protection department.
The early stage of synthetic leather production development, because the pollution problem understanding of manufacturing enterprise to the residue waste liquid produced in production process is not enough, inadequate to the understanding of pollution level, all have employed the behavior of freely discharging, pollution is extremely caused to the ecosystem environment of locality.Because containing a large amount of formic acid, dimethyl formamide in the residue waste liquid of discharge, (being called for short DMF), the high-risk noxious pollutants such as polyurethane resin, mill base and other auxiliary chemicals.Each manufacturing enterprise recognized and the seriousness that residue waste liquid pollutes ecosystem environment have employed again the method for disposal of burning afterwards, was poured in coal by residue waste liquid, put into produce in boiler directly to burn.Because this residue waste liquid is the resultant product in remanufacture process, morph through high temperature reclaimer operation, sex change, coking etc. form gluey walk.Though there is combustibility, incomplete combustion and airtight, mixes with coal and forms clod coal is also burnt endless, also can produce secondary pollution simultaneously.Again afterwards for improve flammability manufacturing enterprise adopt again be diluted with water, aerating spray-on process burning.But in the process of spray burning, the pernicious gas material of a large amount of dense smoke and tar and so on can be produced again, severe contamination air and surrounding enviroment, discharge surrounding and the boiler air duct inwall that a kind of tar can be deposited on boiler furnace when the machine burning have to taking advantage of darkness had, in addition burning, have a strong impact on the normal usage energy and service life of producing boiler.Relevant governmental is that the pollution treatment problem solving residue waste liquid have employed again centralized burning process afterwards again, is concentrated by the residue waste liquid of each manufacturing enterprise to be transported to solidification disposal of waste center and to burn.Solve part pollution problem although it is so, but the process of burning also is the process increasing carbon emission, also burnt the resource of recoverable in residue waste liquid: the theory of the energy-saving and emission-reduction advocated with the whole world as dimethyl formamide (being called for short DMF) is opposed again simultaneously, and the treating capacity postscript of incineration disposal method it is limited, still pile up like a mountain for a large amount of residue waste liquids, in addition burning disposal cost is very high, lays particular stress on the burden of manufacturing enterprise, and the random phenomenon of the row of stealing is managed in enterprise's existence.In burning process produce a large amount of heat energy and also could not utilize, also can produce secondary pollution simultaneously.Current national environmental protection department actively encourage government, the chamber of commerce and enterprise hand in hand common tackling key problem solve the recycling of rectification residue, harmlessness disposing problem, thus how residue waste liquid is disposed and has become an environmental protection subject major issue extremely to be solved.
Therefore, for solving the problems of the technologies described above, the necessary synthetic leather rectification residue reuse method providing a kind of innovation, to overcome described defect of the prior art.
[summary of the invention]
For solving the problems of the technologies described above, the object of the present invention is to provide a kind of processing cost low, can recycle respectively the liquid phase after separation and solid phase, the synthetic leather rectification residue reuse method of energy-conserving and environment-protective.
For achieving the above object, the technical scheme that the present invention takes is: a kind of synthetic leather rectification residue reuse method, and it comprises following processing step:
1), rectification residue is put in retort, and add clear water and stir, the dimethyl formamide in rectification residue is fully dissolved in water;
2), add alkaline solution, regulate pH value to 9.5 ~ 10.4, wash;
3), making rectification residue be decomposed into the suspension of slag and water through stirring, then adding the sulfuric acid solution of concentration 40%, regulate between pH value to 6.5-7.5, then react through the homogenizing of 10-20 minute;
4), add the aluminium chloride of 5% and the macromolecule cation flocculant of 2 ‰ afterwards and stir, making slag class suspension form sediment, reach solid phase and stratified liquid;
5), liquid phase after layering is concentrated by purification, make in liquid phase, to reach the concentration containing dimethyl formamide 8 ~ 10%, and the liquid phase of this concentration is continued to turn back to step 1) in, repeat step 1) to step 5) 4-5 time, make the concentration containing dimethyl formamide in liquid phase reach 20-30%, and rectifying is carried out to liquid phase, extract dimethyl formamide wherein;
6), add calcium lime powder in solid phase after separating the layers, afterwards through the processed of band press filter dewatering machine, the solid phase after dehydration makes mud cake.
Synthetic leather rectification residue reuse method of the present invention is further: described step 1) in, the volume ratio of rectification residue and clear water is 1: 2.
Synthetic leather rectification residue reuse method of the present invention is further: described step 2) in, alkaline solution is specially limewash.
Synthetic leather rectification residue reuse method of the present invention is further: described step 3) in, mixing time is 10-20 minute.
Synthetic leather rectification residue reuse method of the present invention is further: described step 4) in, macromolecule cation flocculant is specially polyacrylamide.
Synthetic leather rectification residue reuse method of the present invention is further: described step 6) in, add flyash in mud cake and make adobe, carry out roasting and make brick.
Synthetic leather rectification residue reuse method of the present invention also can be: described step 6) in, the water after the processed of band press filter dewatering machine gets back to step 1) middle recycling.
Compared with prior art, the present invention has following beneficial effect:
1. synthetic leather rectification residue reuse method of the present invention is according to the composition of different polluters contained in the residue waste liquid in synthetic leather production process, use different chemical principles, different chemicals is adopted to make it to decompose, destroy the molecular structure of original pollutant, it is made to become the granular suspended material of Small molecular, these Small molecular suspensions are condensed into micel by recycling flocculence, these micel rapid subsidence are made to reach solid-liquid layering by sedimentation again, finally the solid phase after sedimentation layering is separated with liquid phase, liquid phase after separation and solid phase are remarketed respectively, reach the object recycled respectively.
2. synthetic leather rectification residue reuse method of the present invention is by disposing the chemical breakdown of rectification residue, and extract dimethyl formamide (DMF) composition reclaimed in residue, one is that resource obtains effective utilization.Two is the harm pollutant components degrading rectification residue, makes rectification residue be degraded to general category solid waste by dangerous class solid waste, through carrying out reprocessing to the solid waste after degraded, reaches the object of cycling and reutilization.
3. synthetic leather rectification residue reuse method of the present invention is disposed the chemical breakdown of rectification residue, changes traditional pattern by high temperature incineration, achieves innoxious, zero-emission; Pattern is disposed in cleaner production, the energy-conserving and environment-protective recycled, and has good Social benefit and economic benefit.
[accompanying drawing explanation]
Fig. 1 is the process chart of synthetic leather rectification residue reuse method of the present invention.
[detailed description of the invention]
Refer to shown in Figure of description 1, the present invention is a kind of synthetic leather rectification residue reuse method, and it comprises following processing step:
1), rectification residue is put in retort, and add clear water and stir, the dimethyl formamide in rectification residue is fully dissolved in water; Wherein, the volume ratio of rectification residue and clear water is 1: 2, utilizes the hydrophily of the dimethyl formamide (DMF) in rectification residue, makes it fully be dissolved in water.
2), add alkaline solution, regulate pH value to 9.5 ~ 10.4, wash; Wherein, described alkaline solution is specially limewash, and the acidic materials on the one hand in residue obtain neutralization reaction in alkali lye, and the gumminess on the other hand in residue and emulsibility are decomposed in alkaline solution water-washing process.
3), making rectification residue be decomposed into the suspension of slag and water through stirring, then adding the sulfuric acid solution of concentration 40%, regulate between pH value to 6.5-7.5, then react through the homogenizing of 10-20 minute, rectification residue is decomposed completely; Wherein, described mixing time is 10-20 minute.
4), in order to make the slag after decomposition and water quick separating, adding the aluminium chloride of 5% and the macromolecule cation flocculant of 2 ‰ and stirring, making slag class suspension form the sediment of alumen ustum, floccule body shape, reach solid phase and stratified liquid; Wherein, described macromolecule cation flocculant is specially polyacrylamide.
5), the liquid phase after layering is concentrated by purification, make in liquid phase, to reach the concentration containing dimethyl formamide 8 ~ 10%, and the liquid phase of this concentration is continued to turn back to step 1) in, to reduce the cost of recycling; Repeat step 1) to step 5) 4-5 time, make the concentration containing dimethyl formamide in liquid phase reach 20-30%, and rectifying is carried out to liquid phase, extract dimethyl formamide wherein, reach the object that liquid phase is recycled.
6), in solid phase after separating the layers, add calcium lime powder, play the effect of sterilization, sterilization, deodorizing, be convenient to dehydration and be separated; Afterwards through the processed of band press filter dewatering machine, the solid phase after dehydration makes mud cake, and the water deviate from also can get back to step 1 again) middle recycling.Because the main component of rectification residue mud cake after resolution process is the filler of the tanning production such as calcium class, wood powder, cloth hair, containing certain calorific value after drying process, having can right property.And make adobe by adding flyash in mud cake, carry out roasting and make brick, reaching the object that solid phase is recycled.
Above detailed description of the invention is only the preferred embodiment of this creation, and not in order to limit this creation, any amendment made within all spirit in this creation and principle, equivalent replacement, improvement etc., within the protection domain that all should be included in this creation.
Claims (7)
1. a synthetic leather rectification residue reuse method, is characterized in that: comprise following processing step:
1), rectification residue residue is put in retort, and add clear water and stir, the dimethyl formamide in rectification residue is fully dissolved in water;
2), add alkaline solution, regulate pH value to 9.5 ~ 10.4, wash;
3), making rectification residue be decomposed into the suspension of slag and water through stirring, then adding the sulfuric acid solution of concentration 40%, regulate between pH value to 6.5-7.5, then react through the homogenizing of 10-20 minute;
4), add the aluminium chloride of 5% and the macromolecule cation flocculant of 2 ‰ afterwards and stir, making slag class suspension form sediment, reach phase and stratified liquid;
5), liquid phase after layering is concentrated by purification, make in liquid phase, to reach the concentration containing dimethyl formamide 8 ~ 10%, and the liquid phase of this concentration is continued to turn back to step 1) in, repeat step 1) to step 5) 4-5 time, make the concentration containing dimethyl formamide in liquid phase reach 20-30%, and rectifying is carried out to liquid phase, extract dimethyl formamide wherein;
6), add calcium lime powder in solid phase after separating the layers, afterwards through the processed of band press filter dewatering machine, the phase after dehydration makes mud cake.
2. synthetic leather rectification residue reuse method as claimed in claim 1, is characterized in that: described step 1) in, the volume ratio of rectification residue and clear water is 1: 2.
3. synthetic leather rectification residue reuse method as claimed in claim 2, is characterized in that: described step 1) in, alkaline solution is specially limewash.
4. synthetic leather rectification residue reuse method as claimed in claim 1, is characterized in that: described step 3) in, mixing time is 10-20 minute.
5. synthetic leather rectification residue reuse method as claimed in claim 1, is characterized in that: described step 4) in, macromolecule cation flocculant is specially polyacrylamide.
6. synthetic leather rectification residue reuse method as claimed in claim 1, is characterized in that: described step 6) in, add flyash in mud cake and make adobe, carry out roasting and make brick.
7. synthetic leather rectification residue reuse method as claimed in claim 6, is characterized in that: described step 6) in, the water after the processed of band press filter dewatering machine gets back to step 1) middle recycling.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201410601895.4A CN104492783B (en) | 2014-10-25 | 2014-10-25 | A kind of synthetic leather rectification residue reuse method |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201410601895.4A CN104492783B (en) | 2014-10-25 | 2014-10-25 | A kind of synthetic leather rectification residue reuse method |
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| CN104492783A true CN104492783A (en) | 2015-04-08 |
| CN104492783B CN104492783B (en) | 2017-04-05 |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP4271423B2 (en) * | 2002-10-29 | 2009-06-03 | 株式会社カネカ | Method and apparatus for separating dimethylamide compound and carboxylic acid by distillation |
| CN101519362A (en) * | 2009-03-26 | 2009-09-02 | 华伦皮塑（苏州）有限公司 | Method for recovering dimethyl formamide |
| CN101759590A (en) * | 2009-05-16 | 2010-06-30 | 石狮龙祥制革有限公司 | DMF recycling method |
| CN203269825U (en) * | 2013-01-04 | 2013-11-06 | 南平博士达节能科技有限公司 | DMF (dimethylfomamide) recovery residue treatment system in synthetic leather manufacturing |
| CN103693792A (en) * | 2013-12-10 | 2014-04-02 | 福建可利盛超细纤维有限公司 | Wastewater zero discharge method in manufacturing process of island superfine fiber synthetic leather |
-
2014
- 2014-10-25 CN CN201410601895.4A patent/CN104492783B/en not_active Expired - Fee Related
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP4271423B2 (en) * | 2002-10-29 | 2009-06-03 | 株式会社カネカ | Method and apparatus for separating dimethylamide compound and carboxylic acid by distillation |
| CN101519362A (en) * | 2009-03-26 | 2009-09-02 | 华伦皮塑（苏州）有限公司 | Method for recovering dimethyl formamide |
| CN101759590A (en) * | 2009-05-16 | 2010-06-30 | 石狮龙祥制革有限公司 | DMF recycling method |
| CN203269825U (en) * | 2013-01-04 | 2013-11-06 | 南平博士达节能科技有限公司 | DMF (dimethylfomamide) recovery residue treatment system in synthetic leather manufacturing |
| CN103693792A (en) * | 2013-12-10 | 2014-04-02 | 福建可利盛超细纤维有限公司 | Wastewater zero discharge method in manufacturing process of island superfine fiber synthetic leather |
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