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Dimethylamine waste water treatment method capable of recovering dimethyl formamide (DMF)

A technology for wastewater treatment and dimethylamine, which is applied in multi-stage water treatment, water/sewage treatment, heating water/sewage treatment, etc. It can solve the problems of waste of resources, cumbersome operation of high-concentration wastewater regeneration, and high cost, and reduce pollution. Effect

Active Publication Date: 2016-05-11
JIANGMEN CHUANYUAN ENVIRONMENT TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Among them, the incineration method causes waste of resources, high cost, and high energy consumption; the air stripping method has a simple process and good removal effect, but it consumes a lot of energy and has secondary pollution; the ion exchange method is less effective in treating low-concentration dimethylamine wastewater. Good, but it is cumbersome to regenerate high-concentration wastewater, and there is secondary pollution; the difficulty of chemical precipitation is to find a precipitant with low cost, good effect and low pollution

Method used

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  • Dimethylamine waste water treatment method capable of recovering dimethyl formamide (DMF)

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] A kind of dimethylamine wastewater treatment method that reclaims DMF comprises the following steps:

[0038] a. Pass the dimethylamine waste water into the mechanically stirred reactor 1, add the salt-forming agent sulfuric acid, stir and mix, the pH value is 6.5, and carry out the salt-forming reaction;

[0039] b. The waste liquid after the salt-forming reaction is passed into the continuous nanofiltration device 3, and the filtrate through the continuous nanofiltration device 3 is recycled to production;

[0040] c. Add sodium hydroxide to the retained liquid that has not passed through the continuous nanofiltration device 3, adjust the pH value to 11, the retained liquid enters the deamination tower 4 for stripping, and the dimethylamine gas is discharged from the top of the deamination tower 4 , the bottom of the deamination tower 4 is a non-amine salt concentrate;

[0041] d. The dimethylamine gas discharged from the top of the tower enters the incinerator 5 for...

Embodiment 2

[0045] A kind of dimethylamine wastewater treatment method that reclaims DMF comprises the following steps:

[0046] a. Pass the dimethylamine waste water into the mechanically stirred reactor 1, add the salt-forming agent sulfuric acid, stir and mix, the pH value is 3, and carry out the salt-forming reaction;

[0047] b. Pass the waste liquid after the salt-forming reaction into the activated carbon filter 2 at a flow rate of 30m / h to remove oil and other organic impurities in the waste liquid;

[0048] c. The waste liquid treated by the activated carbon adsorber 2 is filtered through a precision filter 7 with a filtration accuracy of 5um, and the filtrate enters the continuous nanofiltration device 3, and the filtrate passed through the continuous nanofiltration device 3 is reused for production;

[0049] d. Add sodium hydroxide to the retentate that does not pass through the continuous nanofiltration device 3, adjust the pH value to 11, and the retentate deammonization tower ...

Embodiment 3

[0054] A kind of dimethylamine wastewater treatment method that reclaims DMF comprises the following steps:

[0055] a. Pass dimethylamine waste water into the mechanically stirred reactor 1, add the salt-forming agent sulfuric acid, stir and mix, the pH value is 5, and carry out the salt-forming reaction;

[0056] b. Pass the waste liquid after the salt-forming reaction into the active carbon filter 2 at a flow rate of 3m / h to remove oil and other organic impurities in the waste liquid;

[0057] c. The waste liquid treated by the activated carbon adsorber 2 is filtered through a precision filter 7 with a filtration accuracy of 10um, and the filtrate enters the continuous nanofiltration device 3, and the filtrate passed through the continuous nanofiltration device 3 is reused for production;

[0058] d. Add sodium hydroxide to the retentate that does not pass through the continuous nanofiltration device 3, adjust the pH value to 11, and the retentate deammonization tower 4 is ...

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Abstract

The invention discloses a dimethylamine waste water treatment method capable of recovering dimethyl formamide (DMF). The method comprises the following steps: adding a salt-forming agent into dimethylamine waste water to have a reaction, then enabling the reaction products to enter a continuous nanofiltration device (3), and treating the reaction products; recycling filtrate for production, treating trapped fluid by directly evaporating or alkalifying, adjusting the pH value to be 11.0-12.0, enabling the products to enter a deamination tower (4), deaminizing the products, and carrying out blowoff; discharging dimethylamine gas from the top of the deamination tower (4), burning the discharged gas, and evaporating non-amine salt concentrated liquor at the bottom of the deamination tower (4) to obtain solid salt, wherein the solid salt can be comprehensively utilized, and the condensate water produced by evaporation is reused. According to the method, the technology adopting the continuous nanofiltration device to treat the dimethylamine waste water not only is capable of recovering the DMF and low-purity water, but also is capable of comprehensively utilizing the dimethylamine, thus reducing pollution and fully utilizing resource.

Description

technical field [0001] The invention belongs to the field of wastewater treatment and recycling, in particular to a method for treating dimethylamine wastewater by using a continuous nanofiltration membrane method to recover DMF. Background technique [0002] Synthetic leather factories will produce a large amount of dimethylformamide waste liquid during production. Most tanneries will use direct distillation to recover DMF. A large amount of dimethylamine wastewater will be generated at the top of the tower, and a small amount of DMF will be entrained in the wastewater. As an organic solvent, DMF has a high recovery value; dimethylamine has a foul smell and pollutes the environment, so it is necessary to comprehensively recover and treat dimethylamine wastewater. [0003] At present, the removal of dimethylamine from wastewater mainly includes incineration method, air stripping method, ion exchange method, chemical precipitation method and reverse osmosis membrane method. ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/10F23G7/06C07C231/24C07C233/03
CPCC02F1/001C02F1/04C02F1/442C02F1/58C02F1/66C02F9/00C02F2101/38C02F2301/08C07C231/24F23G7/06F23G2209/14C07C233/03
Inventor 臧立新陈冰心曾玉平余文杰英明达汪晓军
Owner JIANGMEN CHUANYUAN ENVIRONMENT TECH CO LTD
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