CN101519362A - Method for recovering dimethyl formamide - Google Patents
Method for recovering dimethyl formamide Download PDFInfo
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- CN101519362A CN101519362A CN200910116460A CN200910116460A CN101519362A CN 101519362 A CN101519362 A CN 101519362A CN 200910116460 A CN200910116460 A CN 200910116460A CN 200910116460 A CN200910116460 A CN 200910116460A CN 101519362 A CN101519362 A CN 101519362A
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- dimethyl formamide
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- ZMXDDKWLCZADIW-UHFFFAOYSA-N N,N-Dimethylformamide Chemical compound CN(C)C=O ZMXDDKWLCZADIW-UHFFFAOYSA-N 0.000 title claims abstract description 174
- 238000000034 method Methods 0.000 title claims abstract description 34
- BDAGIHXWWSANSR-UHFFFAOYSA-N Formic acid Chemical compound OC=O BDAGIHXWWSANSR-UHFFFAOYSA-N 0.000 claims abstract description 48
- 235000019253 formic acid Nutrition 0.000 claims abstract description 24
- 239000002351 wastewater Substances 0.000 claims abstract description 20
- OSWFIVFLDKOXQC-UHFFFAOYSA-N 4-(3-methoxyphenyl)aniline Chemical compound COC1=CC=CC(C=2C=CC(N)=CC=2)=C1 OSWFIVFLDKOXQC-UHFFFAOYSA-N 0.000 claims description 22
- 239000006200 vaporizer Substances 0.000 claims description 22
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Chemical compound O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 14
- 239000012141 concentrate Substances 0.000 claims description 11
- 239000000463 material Substances 0.000 claims description 10
- 238000010438 heat treatment Methods 0.000 claims description 6
- 238000007670 refining Methods 0.000 claims description 3
- ROSDSFDQCJNGOL-UHFFFAOYSA-N Dimethylamine Chemical compound CNC ROSDSFDQCJNGOL-UHFFFAOYSA-N 0.000 abstract description 20
- 238000000354 decomposition reaction Methods 0.000 abstract description 9
- 238000011084 recovery Methods 0.000 abstract description 6
- 150000004965 peroxy acids Chemical class 0.000 abstract description 3
- 238000004064 recycling Methods 0.000 abstract description 3
- 239000000428 dust Substances 0.000 abstract 1
- 230000008020 evaporation Effects 0.000 abstract 1
- 238000001704 evaporation Methods 0.000 abstract 1
- 241000282326 Felis catus Species 0.000 description 7
- 239000000203 mixture Substances 0.000 description 4
- 238000004821 distillation Methods 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 3
- 238000004519 manufacturing process Methods 0.000 description 3
- GSNUFIFRDBKVIE-UHFFFAOYSA-N DMF Natural products CC1=CC=C(C)O1 GSNUFIFRDBKVIE-UHFFFAOYSA-N 0.000 description 2
- 150000001412 amines Chemical class 0.000 description 2
- 238000010025 steaming Methods 0.000 description 2
- 229920002972 Acrylic fiber Polymers 0.000 description 1
- 239000002253 acid Substances 0.000 description 1
- 239000003513 alkali Substances 0.000 description 1
- 230000000052 comparative effect Effects 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 230000001627 detrimental effect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000002649 leather substitute Substances 0.000 description 1
- 239000002904 solvent Substances 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
Landscapes
- Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)
Abstract
A method for recycling dimethyl formamide relates to a method for recovering dimethyl formamide from waste water by an all-subpressure operation method. The method includes the steps of utilizing conduction oil or low-pressure steam as a heat source, sequentially leading the waste water containing DMF to four subpressure operation towers, and performing subpressure concentration in the first tower and the second tower, subpressure fractionating in the third tower and deacidification in the fourth tower, thereby obtaining finished DMF and methanoic acid. Due to the great decrease of stable operating temperature, the recovery rate of the DMF can reach over 99 percent, and the rate of purity reaches 99.99 percent; the resolution ratio of the DMF and the back evaporation rate of the peracid DMF are obviously reduced, a methanoic acid decomposition tower is cancelled, almost no DMF contains peracid, repeated rectification is not needed, and energy sources are saved by over 10 percent; and meanwhile, the dimethylamine quantity generated by decomposition is little and is completely absorbed by a boiler screen dust collection system without emission.
Description
Technical field
The present invention relates to the method that from waste water, reclaims dimethyl formamide, specially refer to the method that from waste water, reclaims dimethyl formamide with full negative-pressure operation method.
Background technology
Before the present invention proposed, the production process of the synthetic leather factory of numerous domestic, acrylic fiber factory, glove factory all adopted dimethyl formamide (abbreviation: DMF, down together) to prepare burden as solvent.In order to reduce production costs, the protection environment is protected the healthy of people, and these factories all are provided with retrieving arrangement, and DMF is carried out recycling.Also there are many equipment manufacturing typings to make retrieving arrangement, offer factory and use.In general, these devices are four-column process flow mostly, promptly the waste water of Hui Shouing at first carries out vacuum concentration to remove moisture in a tower and two towers, improve the concentration of DMF in the waste water, enter three towers then and carry out rectifying under the normal pressure, obtain pure DMF and the DMF that contains concentration formic acid and high, the DMF that contains concentration formic acid and high at last enters four tower negative pressure extracting towers, obtains pure DMF and formic acid.The device of the type all adopts thermal oil or low-pressure steam as thermal source, and the degree of heat energy recycling is not high.Adopted atmospheric distillation in the device, there is being water to exist under the situation, when temperature reaches 120～130 ℃, DMF very easily produces DMF and formic acid, and DMF and formic acid can produce azeotropic, carry out part and decompose through the still very high formic acid decomposition tower that must enter of the content of DMF in the formic acid behind the four tower negative pressure extracting towers, in alkali and return rectifying tower rectifying repeatedly, the waste of the energy is very big again.DMF decomposites dimethylamine in addition, though can enter in the dedusting of feedwater curtain after the amine tower is deviate from and sour water through taking off, because decomposition amount is excessive, cause dimethylamine not neutralize fully, environment there is pollution, in four such tower retrieving arrangements, the yield less than 95% of finished product.Although transform four tower retrieving arrangements in many places, be increased to five towers or six towers (are promptly set up the formic acid decomposition tower as the recovery tower number, steam takes off the amine tower), even reclaim by four towers and to be transformed into three towers and to reclaim, in energy utilization, can save to some extent, but the rectifying of constant-pressure and high-temperature promotes the decomposition of DMF, still can not solve the low and contaminate environment two large problems of the DMF rate of recovery well.
Summary of the invention
The technical problem to be solved in the present invention is to overcome deficiency of the prior art, proposes a kind of new retrieving arrangement, thereby reduces the rate of recovery that processing temperature improves DMF, reduces the rate of decomposition of DMF, further protects environment, avoids being detrimental to health.
The present invention is achieved by the following technical measures.A kind of method that reclaims dimethyl formamide, this method comprises the following steps:
(1) waste water that will contain DMF is introduced the tower have vaporizer, carry out negative pressure and concentrate, and the water vapor that will leave two cats head is introduced a tower vaporizer as thermal source;
(2) material that will leave a tower bottom is introduced in the vaporizer of two towers have vaporizer, enter two towers after the heating and carry out negative pressure and concentrate, and the water vapor that will leave three cats head is introduced two tower vaporizers as thermal source;
(3) material that will leave two tower bottoms is introduced in the vaporizer of three towers that have vaporizer, enters three towers after the heating and carries out negative pressure rectifying, and thermal oil is introduced three tower vaporizers as thermal source;
(4) material that will leave three tower bottoms is introduced in the vaporizer of four towers that have vaporizer, enters four towers after the heating and carries out the negative pressure depickling, and thermal oil is introduced four tower vaporizers as thermal source;
(5) obtain refining DMF at four tops of tower, obtain formic acid at four tower bottoms; In above-mentioned operation, connect vacuum apparatus respectively, form the negative-pressure operation of a tower～four towers by three tops of tower and four tops of tower;
Represent the precedence of these steps at this with (1)～(5).
The spissated processing condition of a described tower negative pressure are: pressure is-0.08～0.1Mpa, and temperature is 30～60 ℃; Optimum process condition is: pressure is-0.09～0.098Mpa, and temperature is 50～55 ℃.
The spissated processing condition of described two tower negative pressure are: pressure is-0.06～0.08Mpa, and temperature is 60～80 ℃; Optimum process condition is: pressure is-0.07～0.075Mpa, and temperature is 70～75 ℃.
The processing condition of described three tower negative pressure rectifying are: pressure is-0.03～0.06Mpa, and temperature is 95～120 ℃; Optimum process condition is: pressure is-0.035～0.045Mpa, and temperature is 100～110 ℃.
The processing condition of described four tower negative pressure depicklings are: pressure is-0.07～0.09Mpa, and temperature is 95～115 ℃; Optimum process condition is: pressure is-0.08～0.085Mpa, and temperature is 100～105 ℃.
Described thermal source is a low-pressure steam.
After the present invention adopts abovementioned technology, adopt the DMF waste water reclamation technology that contains of full negative pressure operation, particularly reduced the distillation operation temperature significantly, the DMF rate of recovery can reach more than 99%, and purity reaches 99.99%; The steaming rate of returning the rate of decomposition of DMF and peracid DMF reduces by 50 times, and has cancelled the formic acid decomposition tower, contains highly acid DMF and returns the steaming rate and reduce greatly, does not need repetition rectifying, and save energy is more than 10%; Meanwhile, the discharge capacity of dimethylamine significantly reduces, and enters in the dedusting of boiler water curtain and sour water, can reach the environment protection emission requirement fully.
Description of drawings
Accompanying drawing is a material treating processes synoptic diagram of the present invention.
Among the figure: 1,2,3,4 are respectively a tower, two towers, three towers and four towers; 1-1,2-1,3-1,4-1 are respectively a tower vaporizer, two tower vaporizers, three tower vaporizers and four tower vaporizers; 101 for containing the waste water of DMF, and 102 are refining DMF, and 103 is formic acid, and 104 is thermal oil (or low-pressure steam).1-105,2-105,3-105 are respectively the water vapors on the cat head, on two cats head, on three cats head
Embodiment
The invention will be further described below in conjunction with drawings and Examples.
Embodiment 1 as shown in drawings, a kind of method that reclaims dimethyl formamide is carried out in the tower that has vaporizer of four negative-pressure operations.
The waste water 101 that contains 20% left and right sides DMF is introduced into a tower 1 that has vaporizer 1-2 to carry out negative pressure and concentrates, and working pressure is-0.095Mpa that service temperature is 40 ℃, the concentration of DMF can be concentrated to about 40%; The water vapor 2-105 that leaves two cats head simultaneously introduces a tower vaporizer 1-1 and heats waste water in the tower 1 as thermal source; The water vapor 1-105 that leaves a cat head then arranges to the external world.
The waste water that contains 40% left and right sides DMF of being drawn by the bottom of a tower 1 is sent among the vaporizer 2-1 of two towers 2 and the waste water in two towers 2 are heated, then, entering two towers 2 carries out negative pressure and concentrates, working pressure is-0.075Mpa, service temperature is 65 ℃, the concentration of DMF can be concentrated to about 60%; Leave three overhead vapor stream 3-105 simultaneously and introduce two tower vaporizer 2-1 as thermal source;
Send among the vaporizer 3-1 of three towers 3 by the waste water that contains 60% left and right sides DMF that draw the bottom of two towers 2, utilize thermal oil 104 to heat, then, negative pressure rectifying is carried out at the middle part that enters three towers 3, working pressure is-0.03Mpa, service temperature is 103 ℃, can obtain the mixture of DMF and a small amount of formic acid at the bottom of three towers;
Said mixture is sent among the vaporizer 4-1 of four towers 4 and the materials in four towers 4 are heated by thermal oil 104, then, enter four towers 4 and carry out the negative pressure depickling, working pressure is-0.083Mpa, service temperature is 105 ℃, on four towers, 4 tops, can collect finished product DMF 102, then collect formic acid 103 in the bottom of four towers 4.
By above-mentioned method, the yield of DMF can reach 99%; Contain formic acid 18ppm among the finished product DMF, contain dimethylamine 8ppm, contain moisture 280ppm; Leave in the water of reboiler 1-2 of a tower 1 and contain dimethylamine＜100ppm.
Embodiment 2 as shown in drawings, a kind of method that reclaims dimethyl formamide is carried out in the tower that has vaporizer of four negative-pressure operations.Flowing of whole material is all identical with embodiment 1, and difference is operational condition and substitutes thermal oil 104 as thermal source with low-pressure steam.
In the present embodiment, a tower 1 carries out negative pressure and concentrates operational condition: pressure is-0-08Mpa, and temperature is 50 ℃, and the waste water 101 that contains 20% left and right sides DMF can be concentrated to the concentration that contains DMF is about 45%.
Two towers 2 carry out negative pressure and concentrate operational condition: pressure is-0.075Mpa, and temperature is 70 ℃, and the waste water that contains 45% left and right sides DMF can be concentrated to the concentration that contains DMF is about 65%.
Three towers 3 carry out negative pressure rectifying, operational condition: pressure is-0.04Mpa that temperature is 100 ℃, can obtain the mixture of DMF and a small amount of formic acid at the bottom of three towers;
Four towers 4 carry out the negative pressure depickling, operational condition: pressure is-0.08Mpa that temperature is 103 ℃, can collect finished product DMF102 on four towers, 4 tops, then collects formic acid 103 in the bottom of four towers 4.
By above-mentioned method, the yield of DMF can reach 96%; Contain formic acid＜30ppm among the finished product DMF, contain dimethylamine＜10ppm, contain moisture＜300ppm; Leave in the water of reboiler 1-2 of a tower 1 and contain dimethylamine＜100ppm.
Embodiment 3 (Comparative Examples) handles the waste water that contains DMF with four tower recovery methods of prior art.An i.e. tower, two tower negative pressure concentrate; Three tower atmospheric distillations; Four tower negative pressure depicklings; Flowing of material is basic identical with the foregoing description, unique difference be the DMF that contains high formic acid that obtains at the bottom of four towers need through in the buck and after remove three-tower rectification again.
In the present embodiment, a tower negative pressure concentrates, operational condition: pressure is-0.08～-0.085Mpa, temperature is 50～60 ℃, it is about 40% that the waste water 101 that will contain 20% left and right sides DMF is concentrated to the concentration that contains DMF.
Two tower negative pressure concentrate, operational condition: pressure is-0.065～-0.07Mpa, temperature is 80～85 ℃, the waste water that contains 40% left and right sides DMF can be concentrated to the concentration that contains DMF is about 60%.
The spissated operational condition of three tower normal pressures: pressure is 0Mpa, and temperature is 120～130 ℃, can obtain the mixture of DMF and formic acid at the bottom of three towers;
Four tower negative pressure depicklings, operational condition: pressure is-0.075～-0.08Mpa, temperature is 105～110 ℃, can collect finished product DMF on the reboiler of four towers, then collects the DMF that contains high formic acid in the bottom of four towers 4.
By above-mentioned method, the yield of DMF has only 93%; Contain formic acid＜48ppm among the finished product DMF, contain dimethylamine＜15ppm, contain moisture＜380ppm; Leave in the water of reboiler 1-2 of a tower 1 and contain dimethylamine＜3000ppm.
The operational condition and the effect of the foregoing description are compared as follows:
Claims (10)
1. method that reclaims dimethyl formamide, this method comprises the following steps:
(1) waste water (101) that will contain DMF is introduced the tower (1) have vaporizer (1-1), carry out negative pressure and concentrate, and the water vapor that will leave two towers (2) top is introduced the vaporizer (1-1) of a tower (1) as thermal source;
(2) material that will leave a tower (1) bottom is introduced in the vaporizer (2-1) of two towers (2), enter two towers (2) after the heating and carry out negative pressure and concentrate, and the water vapor that will leave three towers (3) top is introduced two towers (2) vaporizers (2-1) as thermal source;
(3) material that will leave two towers (2) bottom is introduced in the vaporizer (3-1) of three towers (3), enters three towers (3) after the heating and carries out negative pressure rectifying, and thermal oil (104) is introduced three tower vaporizers (3-1) as thermal source;
(4) material that will leave three towers (3) bottom is introduced in the vaporizer (4-1) of four towers (4), enters four towers (4) after the heating and carries out the negative pressure depickling, and thermal oil (104) is introduced four tower vaporizers (4-1) as thermal source;
(5) obtain refining DMF (102) at four towers (4) top, obtain formic acid (103) at four tower bottoms; In above-mentioned operation, connect vacuum apparatus respectively, form the negative-pressure operation of a tower～four towers by three towers (3) top and four towers (4) top;
Represent the precedence of these steps at this with (1)～(5).
2. a kind of method that reclaims dimethyl formamide according to claim 1 is characterized in that: the spissated processing condition of a described tower (1) negative pressure are: pressure is-0.08～0.1Mpa, and temperature is 30～60 ℃.
3. a kind of method that reclaims dimethyl formamide according to claim 1 is characterized in that: the spissated processing condition of a described tower (1) negative pressure are: pressure is-0.09～0.098Mpa, and temperature is 50～55 ℃.
4. according to claim 1,2, one of 3 described a kind of methods that reclaim dimethyl formamide, it is characterized in that: the spissated processing condition of described two towers (2) negative pressure are: pressure is-0.06～0.08Mpa, and temperature is 60～80 ℃.
5。According to claim 1,2, one of 3 described a kind of methods that reclaim dimethyl formamide, it is characterized in that: the spissated processing condition of described two towers (2) negative pressure are: pressure is-0.07～0.075Mpa, and temperature is 70～75 ℃.
6. according to claim 1,2,3,4, one of 5 described a kind of methods that reclaim dimethyl formamide, it is characterized in that: the processing condition of described three towers (3) negative pressure rectifying are: pressure is-0.03～0.06Mpa, and temperature is 95～120 ℃.
7. according to claim 1,2,3,4, one of 5 described a kind of methods that reclaim dimethyl formamide, it is characterized in that: the processing condition of described three towers (3) negative pressure rectifying are: pressure is-0.035～0.045Mpa, and temperature is 100～110 ℃.
8. according to claim 1,2,3,4,5,6, one of 7 described a kind of methods that reclaim dimethyl formamide, it is characterized in that: the processing condition of described four towers (4) negative pressure depickling are: pressure is-0.07～0.09Mpa, and temperature is 95～115 ℃.
9. according to claim 1,2,3,4,5,6, one of 7 described a kind of methods that reclaim dimethyl formamide, it is characterized in that: the processing condition of described four towers (4) negative pressure depickling are: pressure is-0.08～0.085Mpa, and temperature is 100～105 ℃.
10. a kind of method that reclaims dimethyl formamide according to claim 1, it is characterized in that: described thermal source is a low-pressure steam.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200910116460XA CN101519362B (en) | 2009-03-26 | 2009-03-26 | Method for recovering dimethyl formamide |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200910116460XA CN101519362B (en) | 2009-03-26 | 2009-03-26 | Method for recovering dimethyl formamide |
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| CN101519362A true CN101519362A (en) | 2009-09-02 |
| CN101519362B CN101519362B (en) | 2012-03-14 |
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| CN200910116460XA Active CN101519362B (en) | 2009-03-26 | 2009-03-26 | Method for recovering dimethyl formamide |
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Cited By (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101792221A (en) * | 2010-04-09 | 2010-08-04 | 安徽南风环境工程技术有限公司 | Method for pre-treating N,N-dimethylformamide-containing waste water |
| CN102408349A (en) * | 2011-11-19 | 2012-04-11 | 无锡双象超纤材料股份有限公司 | System for removing formic acid generated during dimethylformamide recovering process |
| CN102964262A (en) * | 2012-11-29 | 2013-03-13 | 泉州万华世旺超纤有限责任公司 | DMF (dimethyl formamide) recovery device and method in production of synthetic leather |
| CN102961886A (en) * | 2011-08-31 | 2013-03-13 | 吴舒克 | Method for drying raffinate recovered and produced by DMF in leather making industry and absorption processing equipment |
| CN103224260A (en) * | 2013-04-12 | 2013-07-31 | 苏州中色德源环保科技有限公司 | Wastewater treatment and recovery method |
| CN104384172A (en) * | 2014-10-25 | 2015-03-04 | 陈列鑫 | Disposal method for rectification residues in production of synthetic leather |
| CN104492783A (en) * | 2014-10-25 | 2015-04-08 | 傅小娟 | Reutilizationoun method for synthetic leather rectification residue |
| CN104817470A (en) * | 2015-04-14 | 2015-08-05 | 常州冀德环保科技有限公司 | DMAC (dimethylacetamide) or DMF (dimethyl formamide) waste liquid five-tower triple-effect rectification system and recovery method thereof |
| CN104944661A (en) * | 2015-04-14 | 2015-09-30 | 常州冀德环保科技有限公司 | Seven-tower five-effect rectification system for DMAC (N,N-dimethyl acetamide) or DMF (N,N-dimethylformamide) waste liquid and recovery method of seven-tower five-effect rectification system |
| CN105329961A (en) * | 2015-10-29 | 2016-02-17 | 深圳市瑞升华科技股份有限公司 | Waste water treatment system for recycling DMF at low cost |
| CN105693008A (en) * | 2014-12-11 | 2016-06-22 | 三菱丽阳株式会社 | Method and system for treating waste water including organic matter |
| CN106146331A (en) * | 2016-07-02 | 2016-11-23 | 安徽广信农化股份有限公司 | For reclaiming the rectification process of DMF during sucralose produces |
| CN107721870A (en) * | 2017-09-26 | 2018-02-23 | 苏州巨联环保科研有限公司 | The device and DMF recovery systems of formic acid are removed in DMF recovery systems |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100422142C (en) * | 2005-12-06 | 2008-10-01 | 浙江禾欣实业集团股份有限公司 | Dimethyl formylamine solution three-effect rectification recovery method for wet synthesis of leather |
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2009
- 2009-03-26 CN CN200910116460XA patent/CN101519362B/en active Active
Cited By (20)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101792221B (en) * | 2010-04-09 | 2011-07-20 | 安徽南风环境工程技术有限公司 | Method for pre-treating N,N-dimethylformamide-containing waste water |
| CN101792221A (en) * | 2010-04-09 | 2010-08-04 | 安徽南风环境工程技术有限公司 | Method for pre-treating N,N-dimethylformamide-containing waste water |
| CN102961886B (en) * | 2011-08-31 | 2015-05-13 | 吴舒克 | Method for drying raffinate recovered and produced by DMF in leather making industry and absorption processing equipment |
| CN102961886A (en) * | 2011-08-31 | 2013-03-13 | 吴舒克 | Method for drying raffinate recovered and produced by DMF in leather making industry and absorption processing equipment |
| CN102408349A (en) * | 2011-11-19 | 2012-04-11 | 无锡双象超纤材料股份有限公司 | System for removing formic acid generated during dimethylformamide recovering process |
| CN102408349B (en) * | 2011-11-19 | 2014-07-02 | 无锡双象超纤材料股份有限公司 | System for removing formic acid generated during dimethylformamide recovering process |
| CN102964262A (en) * | 2012-11-29 | 2013-03-13 | 泉州万华世旺超纤有限责任公司 | DMF (dimethyl formamide) recovery device and method in production of synthetic leather |
| CN102964262B (en) * | 2012-11-29 | 2016-05-11 | 泉州万华世旺超纤有限责任公司 | DMF recovery method in a kind of synthetic leather production |
| CN103224260A (en) * | 2013-04-12 | 2013-07-31 | 苏州中色德源环保科技有限公司 | Wastewater treatment and recovery method |
| CN103224260B (en) * | 2013-04-12 | 2014-07-23 | 苏州中色德源环保科技有限公司 | Wastewater treatment and recovery method |
| CN104492783A (en) * | 2014-10-25 | 2015-04-08 | 傅小娟 | Reutilizationoun method for synthetic leather rectification residue |
| CN104384172A (en) * | 2014-10-25 | 2015-03-04 | 陈列鑫 | Disposal method for rectification residues in production of synthetic leather |
| CN105693008A (en) * | 2014-12-11 | 2016-06-22 | 三菱丽阳株式会社 | Method and system for treating waste water including organic matter |
| CN105693008B (en) * | 2014-12-11 | 2019-05-10 | 三菱化学株式会社 | The processing method and processing system of waste water containing organic matter |
| CN104817470A (en) * | 2015-04-14 | 2015-08-05 | 常州冀德环保科技有限公司 | DMAC (dimethylacetamide) or DMF (dimethyl formamide) waste liquid five-tower triple-effect rectification system and recovery method thereof |
| CN104944661A (en) * | 2015-04-14 | 2015-09-30 | 常州冀德环保科技有限公司 | Seven-tower five-effect rectification system for DMAC (N,N-dimethyl acetamide) or DMF (N,N-dimethylformamide) waste liquid and recovery method of seven-tower five-effect rectification system |
| CN104817470B (en) * | 2015-04-14 | 2016-09-28 | 常州冀德环保科技有限公司 | A kind of five tower three-effect rectification system and the recovery methods thereof of DMAC or DMF waste liquid |
| CN105329961A (en) * | 2015-10-29 | 2016-02-17 | 深圳市瑞升华科技股份有限公司 | Waste water treatment system for recycling DMF at low cost |
| CN106146331A (en) * | 2016-07-02 | 2016-11-23 | 安徽广信农化股份有限公司 | For reclaiming the rectification process of DMF during sucralose produces |
| CN107721870A (en) * | 2017-09-26 | 2018-02-23 | 苏州巨联环保科研有限公司 | The device and DMF recovery systems of formic acid are removed in DMF recovery systems |
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| CN101519362B (en) | 2012-03-14 |
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