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A four-tower two-effect rectification system for dmac or dmf waste liquid and its recovery method

A technology of rectification system and recovery method, which is applied in the field of four-tower two-effect distillation system and its recovery, which can solve problems such as pollution and air pollution, and achieve the effects of solving solid waste pollution, high recovery rate and good product quality

Active Publication Date: 2016-08-10
常州冀德环保科技有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The purpose of the present invention is to solve the existing environmental protection problems of air pollution and water pollution, and provide a four-tower two-effect rectification system and its recovery method with high recovery rate and good recovery product quality of DMAC or DMF waste liquid

Method used

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  • A four-tower two-effect rectification system for dmac or dmf waste liquid and its recovery method
  • A four-tower two-effect rectification system for dmac or dmf waste liquid and its recovery method

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Embodiment Construction

[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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Abstract

The invention discloses a DMAC (dimethylacetamide) or DMF (dimethyl formamide) waste liquid four-tower double-effect rectification system which comprises a first concentration tower, a second concentration tower, a rectification tower and a deacidifying tower. The invention further discloses a recovery method of the DMAC or DMF waste liquid four-tower double-effect rectification system. The method includes the steps: recovering and treating DMAC or DMF waste liquid; recovering and treating high-boiling objects and solid objects; recycling water; recycling steam. According to the invention, the DMAC or DMF waste is concentrated at the temperature less than 100 DEG C, distillation is performed at the temperature less than 100 DEG C, deacidification is performed at the temperature less than 105 DEG C, the whole process is completely performed at the low temperature, the DMAC or the DMF is not basically decomposed, and the finished product recovery rate of the DMAC or the DMF is higher than 99%. The four-tower double-effect rectification system solves the problems of solid waste pollution and air pollution and creates fine economic benefits, and environments are protected.

Description

technical field [0001] The invention belongs to the field of separation and purification of DMAC or DMF, and in particular relates to a four-tower two-effect rectification system for DMAC or DMF waste liquid and a recovery method thereof. Background technique [0002] DMAC, also known as N,N-dimethylacetamide, DMF, also known as N,N-dimethylformamide, is an excellent organic solvent, widely used in medicine, pesticide, film industry, leather industry, textile industry and other industries , DMAC or DMF waste liquid is produced while in use. [0003] Because DMAC or DMF is a kind of antibacterial agent, it will also kill the activated sludge in the sewage treatment tank at a low concentration. Therefore, there is no good way to treat DMAC or DMF waste liquid by biochemical treatment. In addition, from an economic point of view, it is the best choice to use rectification to treat DMAC or DMF waste liquid. At present, there are many rectification recovery methods for DMAC or D...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D3/00B01D3/14C07C233/03C07C233/05C07C231/24
Inventor 章旭元
Owner 常州冀德环保科技有限公司
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