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

A rectification system and waste liquid technology, applied in the field of separation and purification of DMAC or DMF, can solve problems such as pollution and air pollution, and achieve the effect of high recovery rate and good product quality

Active Publication Date: 2016-09-28
常州冀德环保科技有限公司
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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 to provide a five-tower three-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 five-tower three-effect rectification system for dmac or dmf waste liquid and its recovery method
  • A five-tower three-effect rectification system for dmac or dmf waste liquid and its recovery method

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Embodiment Construction

[0045] A five-tower three-effect rectification system of DMAC or DMF waste liquid, the five-tower three-effect rectification system includes a first concentration tower 101, a second concentration tower 201, a third concentration tower 301, a rectification tower 401 and a degasser Acid tower 501, the material outlet of the waste liquid tank in the tank area is connected to the material inlet of the feed preheater through the waste liquid pump, the material outlet of the feed preheater is connected to the material inlet of the first concentration tower 101, and the first concentration tower The material outlet of 101 is connected with the material inlet of the second concentration tower 201 through the first discharge pump 102, and the material outlet of the second concentration tower 201 is connected with the liquid phase material inlet of the flash tank 203 through the second discharge pump 202, and the flash The liquid phase material outlet of the steam tank 203 is connected ...

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Abstract

The invention discloses a DMAC (dimethylacetamide) or DMF (dimethyl formamide) waste liquid five-tower triple-effect rectification system which comprises a first concentration tower, a second concentration tower, a third concentration tower, a rectification tower and a deacidifying tower. The invention further discloses a recovery method of the DMAC or DMF waste liquid five-tower triple-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, DMAC or DMF waste is concentrated at the temperature below 100 DEG C, the rectification is performed at the temperature below 100 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 five-tower triple-effect rectification system solves the problems of solid waste pollution and air pollution.

Description

technical field [0001] The invention belongs to the field of separation and purification of DMAC or DMF, and in particular relates to a five-tower three-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...

Claims

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Application Information

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