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Recovery method of N,N-dimethylacetamide

A dimethylacetamide and recovery method technology, applied in the field of chemical waste solvent recovery, can solve the problems of reducing the service life of the membrane, reducing the membrane pollution, etc., and achieve the effect of simple process, high extraction efficiency and high purity

Active Publication Date: 2021-03-30
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The feature of this process method is that the energy consumption is greatly reduced compared with the pure rectification process, but it has higher requirements on the raw materials, and cannot contain particles such as salt and impurities, otherwise it will cause membrane pollution and reduce the service life of the membrane.

Method used

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  • Recovery method of N,N-dimethylacetamide
  • Recovery method of N,N-dimethylacetamide
  • Recovery method of N,N-dimethylacetamide

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0048] There is a batch of waste liquid, of which N, N-dimethylacetamide mass concentration is 50%, with chloroform as a master extract, with pyrrole as a helper extractant, using a centrifugal extract, the number of extracted grade is 8, pyrrole in the first Level 2 entry (with chloroform enters measurement), the pyrrole feed mass flow rate is 0.01 times the chloroform gas flow rate, and the total extractant group feed flow rate is 10 times the flow rate of the treatment waste liquid. The final obtained extract phase, into the rectification column 1, the return flow ratio is 1, the pressure is 0.25 atm, the product obtained by the column is obtained into the rectification column 2, and the reflow ratio of the rectification column 2 is 2, and the pressure is 0.25 atm. The product obtained by the tower enters N, N-dimethylacetagidine crude product tower, and the operation of the control tower is 0.5, and the pressure is 0.5 atm. Eventually N, N-dimethylacetamide crude product was o...

Embodiment 2

[0050] There is a batch of waste liquid, of which N, N-dimethylacetamide mass concentration is 30%, with chloroform as the main extractant, with pyrroleration, using a centrifugal extract, the extraction stage is 8, pyrrole in the first Level 3 entry (in chloroform enters measurement), the flow rate of pyrrole feed mass is 0.05 times the chloroform gas flow rate, and the total extractant group feed flow rate is 6 times the flow rate of the treatment waste liquid. The final obtained extract phase, into the rectification column 1, the reflow ratio is 1, the pressure is 0.5 atm, the product obtained by the column is obtained into the rectification column 2, and the reflow ratio of the rectification column 2 is 2, and the pressure is 0.5 atm. The product obtained by the tower enters N, N-dimethylacetagidine crude product tower, and the control tower is 1, and the pressure is 0.5 atm. Eventually N, N-dimethylacetamide crude product was obtained in the top of the column, and finally the...

Embodiment 3

[0052] There is a batch of waste liquid, of which N, N-dimethylacetamide mass concentration is 2%, with chloroform as the main extractant, with pyrroleration, using centrifugal extraction machine, and the extracted stage is 4, pyrrole in the first Level 2 entry (in chloroform enters measurement), the flow rate of pyrrole feed mass is 0.1 times, and the total extractant group feed flow rate is 5 times the flow rate of the treatment waste liquid. The final obtained extract phase, into the rectification column 1, the reflow ratio is 1, the pressure is 0.75 atm, the product obtained by the column is obtained into the rectification column 2, and the reflow ratio of the rectification column 2 is 2, and the pressure is 0.75 atm. The product obtained by the tower enters N, N-dimethylacetamide crude product tower, and the control tower operates from 2, and the pressure is 0.5 atm. Eventually N, N-dimethylacetamide crude product was obtained in the top of the column, and finally the adsorpt...

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Abstract

The invention relates to a method for recovering N, N-dimethylacetamide, which comprises the step of extracting N, N-dimethylacetamide waste liquid by using an extracting agent group consisting of a main extracting agent and an auxiliary extracting agent. According to the method, the extraction efficiency of N,N-dimethylacetamide is greatly improved, the solubility of an extraction agent in a water phase is reduced, the technological process is simple, low in consumption and high in operation flexibility, the obtained product is high in purity and low in moisture content, and other indexes allmeet the cyclic utilization requirements.

Description

Technical field [0001] The present invention relates to the field of chemical waste solvent recovery, and more particularly to N, N-dimethylacetamide recovery methods of extract-rectification process as the core, in particular with the selected extraction group and distribution continuous multi-stage countercurrent Extraction process. Background technique [0002] N, N-dimethylacetamide, referred to as DMAC, is a commonly used non-militant polar solvent, colorless transparent and flammable. It is possible to any mix with water, alcohol, ether, ester, benzene, trichloromethane, and aromatic compounds. N, N-dimethylacetamide is used very widely, in particular, strong dissolution resistance to polymers, which makes a large amount of polymer spinning, fibrous molding, or hollow fiber film or the like, such as During production of polyurethane, polyimide production. In addition, in the pharmaceutical and pesticide industry, N, N-dimethyl acetamide is also an important solvent for the ...

Claims

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Application Information

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IPC IPC(8): C07C231/24C07C233/05
CPCC07C231/24C07C233/05
Inventor 秦磊陈亮蔡立鑫
Owner CHINA PETROLEUM & CHEM CORP
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