CN114805924A - Method for recovering cross-linking agent from DMF (dimethyl formamide) wastewater by using waste alkali liquor - Google Patents
Method for recovering cross-linking agent from DMF (dimethyl formamide) wastewater by using waste alkali liquor Download PDFInfo
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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
- 239000003431 cross linking reagent Substances 0.000 title claims abstract description 72
- 239000002351 wastewater Substances 0.000 title claims abstract description 59
- 239000002699 waste material Substances 0.000 title claims abstract description 40
- 238000000034 method Methods 0.000 title claims abstract description 35
- 239000003513 alkali Substances 0.000 title claims abstract description 30
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 25
- 239000007788 liquid Substances 0.000 claims abstract description 19
- 238000000926 separation method Methods 0.000 claims abstract description 18
- 239000007787 solid Substances 0.000 claims abstract description 17
- 238000010438 heat treatment Methods 0.000 claims abstract description 16
- 239000002244 precipitate Substances 0.000 claims abstract description 16
- 238000005406 washing Methods 0.000 claims abstract description 12
- 238000001035 drying Methods 0.000 claims abstract description 7
- 238000010979 pH adjustment Methods 0.000 claims abstract description 7
- 239000000725 suspension Substances 0.000 claims abstract description 5
- HEMHJVSKTPXQMS-UHFFFAOYSA-M sodium hydroxide Inorganic materials [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 claims description 48
- 150000003839 salts Chemical class 0.000 claims description 15
- 238000011084 recovery Methods 0.000 claims description 12
- 239000004971 Cross linker Substances 0.000 claims description 8
- 239000002912 waste gas Substances 0.000 claims description 8
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims description 7
- 238000004519 manufacturing process Methods 0.000 claims description 5
- 238000006243 chemical reaction Methods 0.000 claims description 2
- 229910001873 dinitrogen Inorganic materials 0.000 claims 1
- 239000000243 solution Substances 0.000 description 7
- 239000000084 colloidal system Substances 0.000 description 5
- 239000003795 chemical substances by application Substances 0.000 description 4
- 239000002904 solvent Substances 0.000 description 4
- 238000001179 sorption measurement Methods 0.000 description 4
- OKKJLVBELUTLKV-UHFFFAOYSA-N Methanol Chemical compound OC OKKJLVBELUTLKV-UHFFFAOYSA-N 0.000 description 3
- 238000005342 ion exchange Methods 0.000 description 3
- 229910052757 nitrogen Inorganic materials 0.000 description 3
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 2
- ROSDSFDQCJNGOL-UHFFFAOYSA-N Dimethylamine Chemical compound CNC ROSDSFDQCJNGOL-UHFFFAOYSA-N 0.000 description 2
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 description 2
- 238000010521 absorption reaction Methods 0.000 description 2
- 239000012043 crude product Substances 0.000 description 2
- 239000004848 polyfunctional curative Substances 0.000 description 2
- 239000010865 sewage Substances 0.000 description 2
- 239000006228 supernatant Substances 0.000 description 2
- BDAGIHXWWSANSR-UHFFFAOYSA-M Formate Chemical compound [O-]C=O BDAGIHXWWSANSR-UHFFFAOYSA-M 0.000 description 1
- VEXZGXHMUGYJMC-UHFFFAOYSA-N Hydrochloric acid Chemical compound Cl VEXZGXHMUGYJMC-UHFFFAOYSA-N 0.000 description 1
- 239000000853 adhesive Substances 0.000 description 1
- 230000001070 adhesive effect Effects 0.000 description 1
- 239000003463 adsorbent Substances 0.000 description 1
- 150000001336 alkenes Chemical class 0.000 description 1
- 239000007864 aqueous solution Substances 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000015556 catabolic process Effects 0.000 description 1
- 239000013064 chemical raw material Substances 0.000 description 1
- 239000000701 coagulant Substances 0.000 description 1
- 239000011248 coating agent Substances 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000006731 degradation reaction Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 239000003814 drug Substances 0.000 description 1
- 229940079593 drug Drugs 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000003344 environmental pollutant Substances 0.000 description 1
- 238000000605 extraction Methods 0.000 description 1
- 150000008282 halocarbons Chemical class 0.000 description 1
- IXCSERBJSXMMFS-UHFFFAOYSA-N hydrogen chloride Substances Cl.Cl IXCSERBJSXMMFS-UHFFFAOYSA-N 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- 238000009776 industrial production Methods 0.000 description 1
- 150000002484 inorganic compounds Chemical class 0.000 description 1
- 229910010272 inorganic material Inorganic materials 0.000 description 1
- 238000009533 lab test Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 150000002894 organic compounds Chemical class 0.000 description 1
- 229920000620 organic polymer Polymers 0.000 description 1
- 239000003960 organic solvent Substances 0.000 description 1
- 239000004033 plastic Substances 0.000 description 1
- 229920003023 plastic Polymers 0.000 description 1
- 231100000719 pollutant Toxicity 0.000 description 1
- 239000002861 polymer material Substances 0.000 description 1
- 238000006116 polymerization reaction Methods 0.000 description 1
- 239000000047 product Substances 0.000 description 1
- 238000000746 purification Methods 0.000 description 1
- 238000004064 recycling Methods 0.000 description 1
- 238000003756 stirring Methods 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 239000012855 volatile organic compound Substances 0.000 description 1
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J11/00—Recovery or working-up of waste materials
- C08J11/04—Recovery or working-up of waste materials of polymers
- C08J11/10—Recovery or working-up of waste materials of polymers by chemically breaking down the molecular chains of polymers or breaking of crosslinks, e.g. devulcanisation
- C08J11/16—Recovery or working-up of waste materials of polymers by chemically breaking down the molecular chains of polymers or breaking of crosslinks, e.g. devulcanisation by treatment with inorganic material
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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
- C02F9/00—Multistage treatment of water, waste water or sewage
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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
- C02F1/008—Control or steering systems not provided for elsewhere in subclass C02F
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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
- C02F1/20—Treatment of water, waste water, or sewage by degassing, i.e. liberation of dissolved gases
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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
- C02F1/66—Treatment of water, waste water, or sewage by neutralisation; pH adjustment
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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
- C02F2001/007—Processes including a sedimentation step
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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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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2209/00—Controlling or monitoring parameters in water treatment
- C02F2209/05—Conductivity or salinity
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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
- C02F2209/00—Controlling or monitoring parameters in water treatment
- C02F2209/06—Controlling or monitoring parameters in water treatment pH
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Abstract
The invention provides a method for recovering a cross-linking agent from DMF (dimethyl formamide) wastewater by using waste alkali liquor. The method comprises the following specific steps: s1, introducing the DMF wastewater into a pH adjusting tank, and adding waste alkali liquor into the tank to stabilize the pH value of the wastewater to be above 10; s2, introducing the wastewater after the pH adjustment treatment into a heating blow-off container, controlling the temperature and carrying out blow-off to destroy the stable state of the cross-linking agent and separate out the water-insoluble cross-linking agent from the water; s3, introducing the wastewater suspension subjected to the heating air stripping treatment into a solid-liquid separation device for solid-liquid separation to separate out generated solid precipitates; s4, washing the solid precipitate obtained in the S3 with pure water for 2-3 times; s5, putting the washed solid precipitate into an oven, and drying at 60 ℃.
Description
Technical Field
The invention relates to the technical field of resources and environment, in particular to a method for recovering a cross-linking agent from DMF (dimethyl formamide) wastewater by using waste alkali liquor.
Background
The cross-linking agent is a widely used organic polymer material, and has the function of generating chemical bonds among linear molecules to connect the linear molecules together to form a net structure, so that the strength and elasticity of the rubber can be improved. Cross-linking agents are customarily referred to in the rubber industry as "vulcanizing agents"; known in the plastics industry as "curing agents", "hardeners"; it is called as "curing agent", "hardener", etc. in the adhesive or coating industry. In industrial production, a cross-linking agent is usually prepared by taking DMF as a solvent, the main process is to obtain the cross-linking agent by an extraction method after polymerization reaction is carried out in a DMF solution, washing water of an extracted product is DMF waste water, and the waste water takes DMF, the cross-linking agent and salt as main pollutants. In addition, the manufacturers of crosslinking agents generally adopt lye washing as the treatment process of the waste gas generated in the production of olefins, methanol, ethanol, HCl, VOCs and the like, so that a large amount of waste gas is generated to absorb the waste lye, and the waste lye is also required to be treated.
DMF is a chemical raw material with wide application, is an excellent solvent with wide application range, can be mixed with water and most organic solvents except halogenated hydrocarbon at will, and has good dissolving capacity for various organic compounds and inorganic compounds. Because DMF can be mutually soluble with water and can also dissolve the cross-linking agent, and the cross-linking agent is insoluble in water, DMF wastewater forms a colloid in an oil-in-water form, and great economic benefit can be generated if the cross-linking agent in the wastewater can be recycled. Because the cross-linking agent is similar to colloid in the DMF solution, and has extremely strong stability, a large amount of cross-linking agent cannot be adsorbed by adopting simple adsorption (ion exchange, activated carbon adsorption and the like), and the purity of the cross-linking agent analyzed by the adsorbent is not high, so that the cross-linking agent cannot reach a crude grade, therefore, the recovery process of adopting adsorption or ion exchange as the cross-linking agent in the DMF wastewater is unrealistic in the actual engineering.
Therefore, there is an urgent need for an efficient process suitable for the recovery of the cross-linking agent from DMF wastewater.
Disclosure of Invention
Aiming at the defects in the prior art, the invention provides a method for recovering a cross-linking agent from DMF (dimethyl formamide) wastewater by using a waste alkali solution.
In order to achieve the purpose, the invention adopts the following technical scheme:
a process for recovering cross-linking agent from DMF sewage by use of waste alkali solution includes such steps as adding waste alkali solution to DMF sewage generated in the process of preparing cross-linking agent, reaction while heating for stripping, solid-liquid separation, washing solid deposit with pure water and baking
In order to optimize the technical scheme, the specific measures adopted further comprise:
a method for recovering a cross-linking agent from DMF wastewater by using a waste alkali solution comprises the following steps:
s1, introducing the DMF wastewater into a pH adjusting tank, and adding waste alkali liquor into the tank to stabilize the pH value of the wastewater to be above 10;
s2, introducing the wastewater after the pH adjustment treatment into a heating blow-off container, controlling the temperature and carrying out blow-off to destroy the stable state of the cross-linking agent and separate out the water-insoluble cross-linking agent from the water;
s3, introducing the wastewater suspension subjected to the heating air stripping treatment into a solid-liquid separation device for solid-liquid separation to separate out solid precipitates, wherein the solid-liquid separation device does not need to stir so as to avoid destroying flocs;
s4, washing the solid precipitate obtained in the S3 for 2-3 times by pure water after being filtered by a water purifier;
s5, putting the washed solid precipitate into an oven, and drying at 60 ℃.
Further, in step S1, the DMF wastewater includes a cross-linking agent, DMF, and a salt, and the pH of the DMF wastewater is 4-5.
Furthermore, the concentration of the cross-linking agent is 700-2000 mg/L, the concentration of DMF is 300-800 mg/L, and the mass fraction of salt is 3% -3.5%.
Further, in step S1, the waste lye is generated by the crosslinker manufacturer after washing the waste gas with lye.
Further, the waste alkali liquor comprises NaOH and salt, and the pH value of the waste alkali liquor is 13.7-14.02.
Further, the mass fraction of NaOH is 2% -4%, and the mass fraction of salt is 2% -2.5%.
Further, in step S2, the temperature-raising stripping container is heated by a water bath to control the temperature.
Further, in step S2, the blow-off temperature was 50 ℃.
Further, in step S5, the oven is flushed with nitrogen to prevent the crude-grade crosslinking agent from being oxidized and affecting the recovery rate and recovery purity.
The method utilizes the waste alkali liquor to recover the cross-linking agent from the DMF wastewater, and simultaneously solves the treatment requirement of the waste alkali liquor generated by absorbing a large amount of waste gas. Under the condition that the aqueous solution is alkaline, DMF is easily decomposed to generate dimethylamine and formate, the colloid state of the wastewater can be damaged by the degradation of DMF, so that the water-insoluble cross-linking agent is separated from the water, and the DMF is continuously decomposed by heating and stripping, so that more colloid is broken, and more cross-linking agent is separated. The process achieves good effect through laboratory experiments. The recovery process can recover more than 75% of the cross-linking agent in the DMF wastewater, the purity of the recovered cross-linking agent can reach more than 85%, a cross-linking agent crude product is formed, and the cross-linking agent with high purity can be obtained after purification.
The invention has the beneficial effects that: the method adopts the waste alkali liquor generated by absorbing the waste gas alkali of a crosslinking agent production enterprise as a treatment agent, treats waste with waste, controls the pH value of the DMF wastewater to be more than 10, degrades DMF and destroys a colloid system of the wastewater, simultaneously promotes DMF to be continuously decomposed by heating and stripping, further separates out a large amount of crosslinking agent, not only saves the addition of liquid alkali, but also reduces the treatment cost of the waste alkali liquor and greatly reduces the treatment cost; the method can recover a large amount of cross-linking agents by simply adding the drugs, does not need to perform analytic concentration, and is more efficient than an adsorption or ion exchange type recovery method; the cross-linking agent separated by the method can reach the grade of a crude product, has no other impurities, and has higher recovery rate and higher purity; the method does not need to add any coagulant, has high solid-liquid separation rate, simple recovery device and low recovery cost; in addition, the process of recycling the cross-linking agent by using the method is easy to realize automatic control.
Drawings
FIG. 1 is a process flow diagram of the method of the present invention.
Detailed Description
Example 1
The DMF wastewater used in the embodiment is wastewater produced by a cross-linking agent production process using DMF as a solvent by a cross-linking agent manufacturer, and comprises three solutes of a cross-linking agent, DMF and salt, wherein the pH value of the wastewater is 4, the concentration of the cross-linking agent is 1600mg/L, the concentration of the DMF is 450mg/L, and the mass fraction of the salt is 3.5%; the pH value of the waste alkali liquor generated by the absorption of the waste gas alkali is 14, the mass fraction of NaOH is 2.5%, and the mass fraction of salt is 2%.
As shown in FIG. 1, the crosslinker was recovered as follows:
s1, pH adjustment treatment: introducing the DMF wastewater into a pH adjusting tank, and adding waste alkali liquor into the tank to stabilize the pH value of the wastewater to 10;
s2, heating and stripping: introducing the wastewater subjected to pH adjustment treatment into a heating blow-off container, heating in a water bath, controlling the temperature at 50 ℃, and carrying out blow-off to destroy the stable state of the crosslinking agent so as to separate out the crosslinking agent insoluble in water from the water;
s3, solid-liquid separation: introducing the waste water suspension subjected to temperature rise air stripping treatment into a solid-liquid separation device for solid-liquid separation to separate out generated solid precipitates;
s4, washing: washing the solid precipitate obtained in step S3 with pure water for 2 times;
s5, drying: and (4) putting the washed solid precipitate into an oven filled with nitrogen, and drying at 60 ℃.
After the DMF wastewater is treated according to the method, the concentration of DMF in the supernatant in the solid-liquid separation device is 15mg/L, and the concentration of the cross-linking agent is 219 mg/L; the recovery rate of the cross-linking agent reaches 86.3 percent, and the purity of the recovered crude cross-linking agent reaches 87 percent.
Example 2
The DMF wastewater used in this example is the same as in example 1, and is generated by a crosslinker production process using DMF as a solvent by a crosslinker manufacturer, and includes three solutes of a crosslinker, DMF, and salt, the pH of the wastewater is 4, the concentration of the crosslinker is 1600mg/L, the concentration of DMF is 450mg/L, and the mass fraction of the salt is 3.5%; the pH value of the waste alkali liquor generated by the absorption of the waste gas alkali is 14, the mass fraction of NaOH is 2.5%, and the mass fraction of salt is 2%.
As shown in FIG. 1, the crosslinker was recovered as follows:
s1, pH adjustment treatment: introducing the DMF wastewater into a pH adjusting tank, and adding waste alkali liquor into the tank to stabilize the pH value of the wastewater to 11;
s2, heating and stripping: introducing the wastewater subjected to pH adjustment treatment into a heating blow-off container, heating in a water bath, controlling the temperature at 50 ℃, and carrying out blow-off to destroy the stable state of the crosslinking agent so as to separate out the crosslinking agent insoluble in water from the water;
s3, solid-liquid separation: introducing the waste water suspension subjected to temperature rise air stripping treatment into a solid-liquid separation device for solid-liquid separation to separate out generated solid precipitates;
s4, washing: washing the solid precipitate obtained in step S3 with pure water for 2 times;
s5, drying: and (4) putting the washed solid precipitate into an oven filled with nitrogen, and drying at 60 ℃.
After the DMF wastewater is treated according to the method, the concentration of DMF in the supernatant in the solid-liquid separation device is 12mg/L, and the concentration of the cross-linking agent is 206 mg/L; the recovery rate of the cross-linking agent reaches 87.1 percent, and the purity of the recovered crude cross-linking agent reaches 87 percent.
The above is only a preferred embodiment of the present invention, and the protection scope of the present invention is not limited to the above-mentioned embodiments, and all technical solutions belonging to the idea of the present invention belong to the protection scope of the present invention. It should be noted that modifications and embellishments within the scope of the invention may be made by those skilled in the art without departing from the principle of the invention.
Claims (10)
1. A method for recovering a cross-linking agent from DMF (dimethyl formamide) wastewater by using waste alkali liquor is characterized in that the waste alkali liquor is added into the DMF wastewater generated in the production process of the cross-linking agent, heating and air stripping are carried out while reaction is carried out, then solid-liquid separation is carried out, and solid precipitates are dried after being washed by pure water, so that the recovery of the cross-linking agent is completed.
2. The method for recovering the cross-linking agent from the DMF waste water by using the waste alkali solution as claimed in claim 1, which is characterized by comprising the following steps:
s1, introducing the DMF wastewater into a pH adjusting tank, and adding waste alkali liquor into the tank to stabilize the pH value of the wastewater to be above 10;
s2, introducing the wastewater after the pH adjustment treatment into a heating blow-off container, controlling the temperature and carrying out blow-off to destroy the stable state of the cross-linking agent and separate out the water-insoluble cross-linking agent from the water;
s3, introducing the wastewater suspension subjected to the heating air stripping treatment into a solid-liquid separation device for solid-liquid separation to separate out generated solid precipitates;
s4, washing the solid precipitate obtained in the S3 with pure water for 2-3 times;
s5, putting the washed solid precipitate into an oven, and drying at 60 ℃.
3. The method of claim 2, wherein the cross-linking agent is recovered from the DMF waste water by using waste lye,
in step S1, the DMF wastewater comprises a cross-linking agent, DMF and salt, and the pH value of the DMF wastewater is 4-5.
4. The method of claim 3, wherein the cross-linking agent is recovered from the DMF waste water by using waste lye,
the concentration of the cross-linking agent is 700-2000 mg/L, the concentration of DMF is 300-800 mg/L, and the mass fraction of salt is 3% -3.5%.
5. The method of claim 2, wherein the cross-linking agent is recovered from the DMF waste water by using waste lye,
in step S1, the waste lye is generated by a crosslinker manufacturer by washing the waste gas with lye.
6. The method of claim 5, wherein the cross-linking agent is recovered from the DMF waste water by using waste lye,
the waste alkali liquor comprises NaOH and salt, and the pH value of the waste alkali liquor is 13.7-14.02.
7. The method of claim 6, wherein the cross-linking agent is recovered from the DMF waste water by using waste lye,
the mass fraction of NaOH is 2-4%, and the mass fraction of salt is 2-2.5%.
8. The method of claim 2, wherein the cross-linking agent is recovered from the DMF waste water by using waste lye,
in step S2, the temperature-raising air stripping container is heated in a water bath to control the temperature.
9. The method of claim 2, wherein the cross-linking agent is recovered from the DMF waste water by using waste lye,
in step S2, the stripping temperature was 50 ℃.
10. The method of claim 2, wherein the cross-linking agent is recovered from the DMF waste water by using waste lye,
in step S5, the oven is flushed with nitrogen gas.
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Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CA2653192A1 (en) * | 2006-05-23 | 2008-02-07 | V.B. Medicare Pvt. Ltd. | Recovery of dimethylformamide and other solvents from process streams of manufacture of trichlorogalactosucrose |
| CN105198174A (en) * | 2015-10-29 | 2015-12-30 | 南京大学盐城环保技术与工程研究院 | Method for treating chemical industry wastewater containing organic nitrogen DMF (N,N-dimethylformamide) |
| CN105502855A (en) * | 2016-01-29 | 2016-04-20 | 安徽汇泽通环境技术有限公司 | Method for performing combined treatment on TAIC industrial wastewater through alkaline demulsification and hydrolysis-contact oxidation system |
| WO2016187878A1 (en) * | 2015-05-28 | 2016-12-01 | 鹤山市新科达企业有限公司 | Treatment technology for synthetic leather production wastewater |
| CN107673571A (en) * | 2017-12-04 | 2018-02-09 | 湖南大辰环保科技有限公司 | DMF comprehensive treatment method for wastewater and system in a kind of film production |
| CN111573916A (en) * | 2020-05-21 | 2020-08-25 | 南京大学盐城环保技术与工程研究院 | Method and system for recycling dimethyl formamide wastewater |
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Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CA2653192A1 (en) * | 2006-05-23 | 2008-02-07 | V.B. Medicare Pvt. Ltd. | Recovery of dimethylformamide and other solvents from process streams of manufacture of trichlorogalactosucrose |
| WO2016187878A1 (en) * | 2015-05-28 | 2016-12-01 | 鹤山市新科达企业有限公司 | Treatment technology for synthetic leather production wastewater |
| CN105198174A (en) * | 2015-10-29 | 2015-12-30 | 南京大学盐城环保技术与工程研究院 | Method for treating chemical industry wastewater containing organic nitrogen DMF (N,N-dimethylformamide) |
| CN105502855A (en) * | 2016-01-29 | 2016-04-20 | 安徽汇泽通环境技术有限公司 | Method for performing combined treatment on TAIC industrial wastewater through alkaline demulsification and hydrolysis-contact oxidation system |
| CN107673571A (en) * | 2017-12-04 | 2018-02-09 | 湖南大辰环保科技有限公司 | DMF comprehensive treatment method for wastewater and system in a kind of film production |
| CN111573916A (en) * | 2020-05-21 | 2020-08-25 | 南京大学盐城环保技术与工程研究院 | Method and system for recycling dimethyl formamide wastewater |
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