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Method for separating butanone-isopropanol-ethyl alcohol azeotrope through three-tower pressure-variable rectification

A technology for pressure swing rectification and separation of butanone, which is applied in chemical instruments and methods, preparation of organic compounds, separation/purification of carbonyl compounds, etc., to achieve the effects of low equipment investment cost, low energy consumption and simple process

Active Publication Date: 2017-07-21
QINGDAO UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

This method is suitable for the separation of acetonitrile-methanol-benzene and other systems that form azeotropes in pairs, but not for the separation of methyl ethyl ketone-isopropanol-ethanol azeotropes

Method used

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  • Method for separating butanone-isopropanol-ethyl alcohol azeotrope through three-tower pressure-variable rectification
  • Method for separating butanone-isopropanol-ethyl alcohol azeotrope through three-tower pressure-variable rectification
  • Method for separating butanone-isopropanol-ethyl alcohol azeotrope through three-tower pressure-variable rectification

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Experimental program
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Effect test

Embodiment 1

[0045] The feed flow rate is 1000kg / h, the temperature is 40°C, and the mass composition is: butanone 70%, isopropanol 10%, and ethanol 20%. The butanone column (T1) has a theoretical plate number of 34, the raw material liquid is introduced from the 26th plate, the circulating feed position is the 12th plate, the operating pressure is 4.0atm, the reflux ratio is 2.00, and the column diameter is about 490mm; The theoretical plate number of the isopropanol column (T2) is 100, and the production liquid at the top of the butanone column (T1) is introduced from the 44th plate, the operating pressure is 1.0atm, the reflux ratio is 7.50, and the column diameter is about 790mm; ethanol The number of theoretical plates in the tower (T3) is 30, and the production liquid from the top of the isopropanol tower (T2) is introduced from the 16th plate. The operating pressure is 0.4atm, the reflux ratio is 2.40, and the tower diameter is about 530mm. After separation and treatment, the purity...

Embodiment 2

[0051] The feed flow rate is 1000kg / h, the temperature is 40°C, and the mass composition is: butanone 70%, isopropanol 10%, and ethanol 20%. The theoretical plate number of the isopropanol column (T2) is 77, the raw material liquid is introduced from the 19th plate, the operating pressure is 0.1atm, the reflux ratio is 1.80, and the column diameter is about 960mm; the theoretical plate number of the butanone column (T1) is There are 35 blocks, the production liquid at the top of the isopropanol tower (T2) is introduced from the 22nd plate, the circulating feed position is the 17th plate, the operating pressure is 5.8atm, the reflux ratio is 2.20, and the tower diameter is about 400mm; The number of theoretical plates of the ethanol column is 32, the production liquid from the top of the butanone column (T1) is introduced from the 13th plate, the operating pressure is 0.4atm, the reflux ratio is 2.10, and the column diameter is about 350mm. After separation and treatment, the p...

Embodiment 3

[0057] Such as image 3 As shown, the heat integration technology can be implemented in the separation sequence of butanone-isopropanol-ethanol three-column pressure swing rectification process, using the butanone column (T1) overhead steam to condense and release heat into the isopropanol column (T2) And the ethanol tower (T3) provides heat to achieve the purpose of saving energy and reducing consumption and reducing equipment investment. Butanone tower (T1) among the figure is the high-pressure tower of operating pressure 4atm, and the butanone product that purity can reach 99.9wt% is extracted at the bottom of the tower, and the tower top is butanone-isopropanol-ethanol azeotrope, and the tower top temperature is 118.08°C. The isopropanol tower (T2) tower is the atmospheric tower of operating pressure 1.0atm, and the isopropanol product with purity up to 99.3wt% is produced at the bottom of the tower, and the tower top is a methyl ethyl ketone-ethanol mixture containing a ...

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Abstract

The invention relates to a method for separating butanone-isopropanol-ethyl alcohol azeotrope through three-tower pressure-variable rectification, solving the problem of difficulty in separation of near-boiling-point ternary systems due to multigroup azeotropy and rectification boundary. According to the characteristics that azeotropy composition and azeotropy points are sensitive to pressure change and the sequence of pure material boiling points is changed under different pressures, two separation sequences are designed to separate the butanone-isopropanol-ethyl alcohol azeotrope. Through a partial heat integration mode, heat accumulation among three towers is achieved, and accordingly, energy consumption is reduced to the greatest extent. The method has the advantages of energy conservation, environment protection, high purity of separated products, simple process, cost saving and the like.

Description

[0001] 【Technical field】 [0002] The invention belongs to the field of chemical separation and purification, and relates to a method for separating methyl ethyl ketone-isopropanol-ethanol azeotrope through three-tower pressure-swing rectification, in particular to a method of using pressure changes to make the azeotropic composition and azeotropic point of the system occur The method of change, using pressure changes to determine the separation sequence and using heat integration to reduce energy consumption. [0003] 【Background technique】 [0004] Butanone is an excellent organic solvent and raw material for organic synthesis, mainly used as a solvent for various resins in the coating industry; isopropanol is an important chemical raw material that can be used for organic synthesis, and is also widely used as an antifreeze additive for petroleum fuels , automobile and aviation fuel, etc.; ethanol is the most widely used alcohol, and is an important organic synthesis raw mate...

Claims

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Application Information

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IPC IPC(8): C07C29/80C07C31/08C07C31/10C07C45/82C07C49/04
CPCC07C29/80C07C45/82C07C31/08C07C31/10C07C49/04Y02P20/10
Inventor 王英龙李敏文桂林耿雪丽朱兆友
Owner QINGDAO UNIV OF SCI & TECH
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