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Process for recovering dimethyl formyl amide from waste water

A technology of dimethylformamide and a recovery method, applied in the field of solvent recovery, can solve the problems of high energy consumption and low economic benefit, and achieve the effects of low energy consumption, improved heat utilization rate, and reduced steam consumption.

Inactive Publication Date: 2007-05-23
TSINGHUA UNIV
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Problems solved by technology

[0005] The present invention aims at the disadvantages of high energy consumption and low economic benefit of the traditional water treatment of DMF in waste water, especially low-concentration DMF, and proposes a new method for reclaiming DMF in waste water

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  • Process for recovering dimethyl formyl amide from waste water

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Embodiment Construction

[0017] The invention provides a method for recovering dimethylformamide (DMF) in waste water. The method mainly includes two processes of extraction and rectification. First, an organic solvent is used for extraction, and the DMF in the aqueous solution is transferred to an organic solvent, and then Then realize the separation of DMF and organic solvent by rectification. The extraction agent is selected to meet the following properties: 1. good compatibility with DMF (generally miscible); 2. very low compatibility with water (solubility in water < 1%): 3. The boiling point difference with DMF is ≥80°C. Commonly selected solvents such as chloroform, carbon tetrachloride, 1,1 dichloroethane, 1,1,1 trichloroethane, 1,2 dichloroethylene, chloropropane and trichloropropene, etc. The rectification and separation process of the organic solvent and dimethylformamide is divided into two stages of preliminary separation and refining and purification, wherein the rectification method us...

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Abstract

The invention relates to a recycle method for dimethyl formamide from waste water. The feature is that it contains two processes of extraction and rectification. The acid impurity could be neutralized by organic alkali to avoid the corruption to the device. The power consumption is decreased, and the process is simple. The purity of dimethyl formamide could be 99.9% and the recovery rate could reach to 98.5%.

Description

technical field [0001] The invention relates to a recovery method of a solvent, in particular to a method for recovery of dimethylformamide (DMF) in waste water using a combined technology of extraction and rectification, and belongs to the technical field of separation and purification of dimethylformamide. Background technique [0002] N,N-Dimethylformamide, referred to as DMF, is an excellent industrial solvent and organic synthetic material, widely used in many industries, mainly including: 1) solvent for polyacrylonitrile fiber spinning; 2) in petrochemical industry As a gas absorbent in the selective absorption of acetylene and the separation and purification of C4 such as butadiene; 3) as a solvent in the production of artificial leather. These application processes correspondingly produce a large amount of wastewater containing DMF. How to economically and effectively recover the DMF and treat the accompanying wastewater is very important for improving the overall ec...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07C231/24C07C233/03C02F1/26C02F1/04
Inventor 杨明德吴玉龙党杰胡湖生王欣昌何培炯
Owner TSINGHUA UNIV