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Method for extracting acetone from acetone-dichloromethane-methanol-water mixed liquor by azeotropy and composite extraction reditification integration and equipment thereof

A technology of extractive distillation and methylene chloride, which is applied in the field of azeotropic and compound extractive distillation integration, can solve the problems of high energy consumption and complicated separation process in the separation process, and achieve high product purity, simple process steps, low material consumption and energy consumption low effect

Inactive Publication Date: 2010-12-15
NANJING NORMAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Using anhydrous potassium carbonate or anhydrous calcium sulfate to dry and dehydrate, and then distill, more than 98% of acetone can be obtained, but the energy consumption of the separation process is high, and a large amount of waste liquid needs to be treated. The separation process of this method is complicated

Method used

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  • Method for extracting acetone from acetone-dichloromethane-methanol-water mixed liquor by azeotropy and composite extraction reditification integration and equipment thereof
  • Method for extracting acetone from acetone-dichloromethane-methanol-water mixed liquor by azeotropy and composite extraction reditification integration and equipment thereof
  • Method for extracting acetone from acetone-dichloromethane-methanol-water mixed liquor by azeotropy and composite extraction reditification integration and equipment thereof

Examples

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Effect test

Embodiment 1

[0028] A kind of process method of azeotropic rectification and compound extractive rectification integrated extraction acetone, refer to figure 1 In the process flow shown, the raw material enters the azeotropic rectification tower T3 and undergoes azeotropic distillation to obtain 50-75% acetone. At the same time, a small amount of dichloromethane is removed, and 50-75% acetone enters the compound extractive rectification tower T1 through After compound extraction and rectification, more than 98.5% of acetone can be obtained at one time, and the yield can reach more than 97%. The mixed extractant is treated by the regeneration tower T2 and then recycled. In the figure, E1, E2 and E3 are the condensers of the towers T3, T1 and T2 respectively, and R1, R2 and R3 are the reboilers of the towers T3, T1 and T2 respectively.

[0029] The raw material ① is a mixture of acetone, dichloromethane, methanol and water, which comes from the by-products in the synthesis reaction of pharma...

Embodiment 2

[0035] Substantially the same as Example 1, but following changes are arranged: the feed rate ratio of sulfolane and ethylene glycol (mixed extractant) is 1: 1.5, mixed solvent and the tower bottom mixed liquor of azeotropic rectification tower T3 3. feed rate ratio 0.8:1.

Embodiment 3

[0037] Substantially the same as Example 1, but with the following changes: the feed ratio of sulfolane and ethylene glycol (mixed extractant) is 1:0.5, and the mixed solvent and azeotropic distillation column T3 tower bottom mixed liquid ③ feed ratio 1.2:1.

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Abstract

The invention discloses a method for extracting acetone from acetone-dichloromethane-methanol-water mixed liquor by azeotropy and composite extractive distillation integration, comprising the following steps: (1) the mixed liquor of raw materials acetone, dichloromethane, methanol and water is performed with azeotropic distillation firstly, and 50-75% of acetone is obtained at the bottom of an azeotropy tower; (2) above 50-75% of acetone is extracted, rectified and separated by a mixed solvent of sulfolane and glycol, more than 98.5% of acetone is obtained on the top of a composite extractionrectifying column, and a mixed extractant containing methanol and water flows out of a tower bottom; (3) the mixed extractant is performed with rectification treatment by a regenerator, 98% of methanol and an aqueous solution are respectively obtained on the top of the regenerator, and the mixed extractant is obtained at the tower bottom; and the mixed extractant is recycled. The invention has simple processing step and high product purity; and because the mixed extractant can be recycled, energy consumption is low. The invention also discloses equipment for realizing the method.

Description

technical field [0001] The present invention relates to a process for integrating azeotropic and compound extraction and rectification, in particular to a process for extracting acetone from a mixed solution of acetone, methylene chloride, methanol and water by integrating azeotropic and compound extractive distillation; It relates to the equipment used in the above method. Background technique [0002] Acetone is an important organic raw material in chemical industry, artificial fiber, medicine, paint, plastic, plexiglass, cosmetics and other industries. It is an excellent organic solvent that can dissolve many organic products such as resin, cellulose acetate, acetylene, etc. Solvent for nitrocellulose. In industry, acetone is mainly used as a solvent in explosives, plastics, rubber, fiber, leather, oil, paint and other industries, and can also be used to synthesize ketene, acetic anhydride, iodoform, polyisoprene rubber, methacrylic acid , methyl ester, chloroform, epox...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C49/08C07C45/82B01D3/34
Inventor 顾正桂林军刘俊华马振叶
Owner NANJING NORMAL UNIVERSITY
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