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Method for recycling DMAC from membrane preparation industrial wastewater

A technology for industrial waste water and waste water, applied in the chemical industry, sustainable manufacturing/processing, climate sustainability, etc., can solve the problems of high energy consumption of DMAC, and achieve the effect of reducing energy consumption and high product quality

Inactive Publication Date: 2019-03-08
HEBEI UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to overcome the problem of high energy consumption of reclaiming DMAC from membrane industrial wastewater in the prior art, especially for particularly low-concentration DMAC wastewater (such as the wastewater of DMAC with a mass fraction of 5%-15%), to provide a membrane Method for recovering DMAC from industrial wastewater

Method used

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  • Method for recycling DMAC from membrane preparation industrial wastewater
  • Method for recycling DMAC from membrane preparation industrial wastewater

Examples

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Effect test

Embodiment 1

[0046] In the following implementation example, the wastewater from the membrane industry determines the parameters as the feed situation, the feed flow rate is 2000kg / h, the DMAC content is 5%, the polymer is 1.2%, and the feed is at normal pressure and temperature; the total output at the top of the tower is 1800kg / h, the tower kettle is 200kg / h. The separation goal is: the yield of DMAC in the bottom of the column in the three-effect rectification is 100%.

[0047] The material DMAC waste water F1 enters from 20 plates of the first rectification tower T1 at normal temperature and pressure, and the operating reflux ratio at the top of the tower is 0.18. The tower top of T1 is refluxed, the production liquid is water, and the production volume at the top of the tower is 569kg / h. The bottom of the first rectification tower T1 is a mixture of DMAC and water, and the reflux liquid passes through the first heat exchanger H1 at 57-70 °C is refluxed in the bottom of the tower, th...

Embodiment 2

[0052] In the following implementation example, the wastewater from the membrane industry determines the parameters as the feed situation, the feed flow rate is 2000kg / h, the DMAC content is 15%, the polymer is 1.3%, and the feed is at normal pressure and temperature; the total output at the top of the tower is 1600kg / h, the tower kettle is 200kg / h. The separation goal is: the yield of DMAC in the bottom of the column in the three-effect rectification is 100%.

[0053] The material DMAC waste water F1 enters from the 18 plates of the first rectification tower T1 under normal temperature and pressure, and the operating reflux ratio at the top of the tower is 0.17. The top reflux of T1, the production fluid is water, the production volume at the top of the tower is 506kg / h, the bottom of the first rectification tower T1 is a mixture of DMAC and water, and the reflux liquid passes through the first heat exchanger H1 at 57.6-67.9 °C is refluxed in the bottom of the tower, and th...

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Abstract

The invention discloses a method for recycling DMAC from membrane preparation industrial wastewater. According to the method, DMAC wastewater is treated in an operation mode of decompressed countercurrent triple-effect distillation, the process comprises three towers and one concentration tower, by adopting a decompression mode, the boiling point of DMAC is reduced, and thus the purpose of separation is achieved. By adopting the method, the heat conduction efficiency of materials can be improved, and due to multi-effect distillation, gradient utilization of heat energy can be achieved.

Description

technical field [0001] The invention relates to the field of membrane industrial waste water recovery, and relates to a method for recovering DMAC from waste water by using a multi-effect rectification method. Background technique [0002] DMAC (Dimethylacetamide) is a highly polar aprotic solvent, colorless and transparent, and can be completely miscible with solvents such as water, esters, alcohols, ketones, ethers, and aromatic compounds. Resin, synthetic fiber, plastic film, etc. have excellent solubility and are important chemical raw materials. Compared with N,N-dimethylformamide (DMF), it has lower toxicity and volatility, higher stability, and is not easy to change color. It is widely used in petroleum processing and organic synthesis industries, so this kind of wastewater is treated and recycled DMAC is of great significance. DMAC is an important reaction solvent for the production of blended polyether alum hollow fiber membranes. It has the characteristics of hig...

Claims

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Application Information

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IPC IPC(8): C07C233/05C07C231/24
CPCC07C231/24C07C233/05Y02P20/10
Inventor 王洪海韦晓晓薛璐璐王钊周琦李春利
Owner HEBEI UNIV OF TECH