DMAC (dimethylacetamide) or DMF (dimethyl formamide) waste liquid four-tower double-effect rectification system and recovery method thereof
A technology of a rectification system and a recovery method, which is applied to a four-column two-effect rectification system and its recovery field, can solve problems such as air pollution and pollution, and achieve the effects of high recovery rate, solid waste pollution and good product quality.
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[0042] A four-tower two-effect rectification system for DMAC or DMF waste liquid, the four-tower two-effect rectification system includes a first concentration tower 101, a second concentration tower 201, a rectification tower 301 and a deacidification tower 401, a tank area The material outlet of the waste liquid tank is connected with the material inlet of the feed preheater through the waste liquid pump, the material outlet of the feed preheater is connected with the material inlet of the first concentration tower 101, and the material outlet of the first concentration tower 101 is connected through the first outlet The material pump 102 is connected with the liquid phase material inlet of the flash tank 203, the liquid phase material outlet of the flash tank 203 is connected with the material inlet of the feed evaporator 204 through the forced circulation pump, and the material outlet of the feed evaporator 204 is connected with the flash evaporation tank 204. The gas phase...
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