Recovery system and recovery method for dimethylacetamide in ultra-filtration membrane production wastewater

Abstract

The invention discloses a recovery system and a recovery method for dimethylacetamide in ultra-filtration membrane production wastewater. The recovery method comprises that 1) wastewater is preheatedwith steam by a feed material preheater, and the preheated wastewater is fed into a refining tower; 2) the gas phase component of the refining tower top is pressurized by a water vapor compressor to form superheated steam, one part of the superheated steam is used as the heat source of the feed material preheater to heat a feed material, and the remaining part is used as the heating heat source for a middle reboiler; 3) the tower top material after the heat exchange enters the condenser of the refining tower, and is condensed through air cooling, the condensed material is fed into the reflow tank of the refining tower, one part as the refining tower reflux returns to the refining tower, and the other part is extracted as reused water so as to be recycled; 4) a DMAC product is extracted from the side line of the refining tower; and 5) the refining tower kettle discharge material is heated by the reboiler of the refining tower, one part of the heated material is used as the tower kettledischarge material, and enters a high boiling point material treatment system, and one part is circulated to the tower kettle of the refining tower. With the system and the method of the present invention, the consumption of the circulation water is reduced so as to achieve the energy saving effect.

Description

technical field [0001] The invention relates to the technical field of ultrafiltration membrane production, in particular to a recovery system and method for dimethylacetamide in ultrafiltration membrane production wastewater. Background technique [0002] Dimethylacetamide (DMAC) is a highly polar colorless transparent liquid that can dissolve various compounds and is completely miscible with water, ether, ketone, ester, etc. It has high thermal stability, is not easily hydrolyzed, and has low corrosion It has the characteristics of low toxicity and good dissolving ability for various resins, especially polyurethane resin and polyimide resin, and can be used as a solvent for heat-resistant synthetic fibers, plastic films, paints, medicines, and acrylonitrile spinning. As an aprotic solvent and chemical intermediate with low toxicity, high boiling point and high polarity, dimethylacetamide is widely used in the fields of synthetic materials, medicine, pesticides, chemical fi...

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Problems solved by technology

However, this invention also has to deal with a large amount of water, consumes a large amount of steam, and has the problem of high energy consumption. At the same time, a vacuum pump system, a dehydration tower and a DMAC refining tower are installed, and the process is relatively complicated.

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