Method of separating acetone-isopropanol-water by three-tower heat-integrated extraction distillation

A technology of extractive distillation and isopropanol, which is applied in chemical instruments and methods, separation/purification of carbonyl compounds, preparation of organic compounds, etc., can solve problems such as high energy consumption, complicated operation, and great impact on product quality, and achieve The effect of low energy consumption, high product purity and low equipment investment

Active Publication Date: 2017-12-15
青岛三瑞节能环保技术有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The method adopts a batch extraction and rectification device, and the ethylene glycol solution containing ionic liquid 1-ethyl-3-methylimidazole chloride is used as the extraction agent. Isopropanol is extracted from the top of the distillation tower, and the transitional distillation between isopropanol and water is carried out by batch distillation. The operation is complicated, the energy consumption is large, and the product quality is greatly affected.

Method used

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  • Method of separating acetone-isopropanol-water by three-tower heat-integrated extraction distillation

Examples

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Effect test

Embodiment 1

[0037] The feed temperature is 45° C., the flow rate is 1700 kg / h, and the pressure is 1 atm (absolute pressure). The feed contains 90% acetone, 5% isopropanol and 5% water. The operating pressure of the acetone column T1 is 1 atm (absolute pressure), the number of theoretical plates is 25, the feed plate of the fresh stream is 9, the reflux ratio is 2, the temperature at the top of the tower is 55.9°C, and the temperature at the bottom of the tower is 79.8°C; the operation of the isopropanol tower T2 is The pressure is 1atm (absolute pressure), the number of theoretical plates is 26, the material feed plate from the bottom of acetone column T1 is 18, the number of extractant feed plates is 5, the solvent ratio is 5:1, the reflux ratio is 1.5, and the top of the tower The temperature is 81.9°C, the temperature at the bottom of the tower is 145.8°C; the operating pressure of the solvent recovery tower T3 tower is 1 atm (absolute pressure), the number of theoretical plates is 14,...

Embodiment 2

[0039] The feed temperature is 45° C., the flow rate is 1800 kg / h, and the pressure is 1 atm (absolute pressure). The feed contains 93% acetone, 5% isopropanol, and 2% water. The operating pressure of the acetone column T1 is 1 atm (absolute pressure), the number of theoretical plates is 20, the feed plate of the fresh stream is 8, the reflux ratio is 1.8, the temperature at the top of the tower is 55.8°C, and the temperature at the bottom of the tower is 79.9°C; the operation of the isopropanol tower T2 is The pressure is 1atm (absolute pressure), the number of theoretical plates is 29, the material feed plate from the bottom of acetone column T1 is 20, the number of extraction agent feed plates is 6, the solvent ratio is 5:1, the reflux ratio is 2.3, and the top of the tower The temperature is 81.7°C, the temperature at the bottom of the tower is 145.9°C; the operating pressure of the solvent recovery tower T3 tower is 1 atm (absolute pressure), the number of theoretical plat...

Embodiment 3

[0041] The feed temperature is 45° C., the flow rate is 1750 kg / h, and the pressure is 1 atm (absolute pressure). The feed contains 95% acetone, 2% isopropanol, and 3% water. The operating pressure of the acetone column T1 is 1 atm (absolute pressure), the number of theoretical plates is 26, the feed plate of the fresh stream is 11, the reflux ratio is 2.1, the temperature at the top of the tower is 56.3°C, and the temperature at the bottom of the tower is 80.2°C; the operation of the isopropanol tower T2 is The pressure is 1atm (absolute pressure), the number of theoretical plates is 32, the material feed plate from the bottom of acetone column T1 is 22, the number of extraction agent feed plates is 8, the solvent ratio is 5:1, and the reflux ratio is 2.6. The temperature is 82.6°C, the temperature at the bottom of the tower is 146.3°C; the operating pressure of the solvent recovery tower T3 tower is 1 atm (absolute pressure), the number of theoretical plates is 17, the feed p...

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Abstract

The invention relates to a method of separating acetone-isopropanol-water by three-tower heat-integrated extraction distillation. A device mainly comprises an acetone tower T1, an isoprpanol tower T2, a solvent recovery tower T3, a heat exchanger H1 and a preheater H2. In the method provided by the invention, a tree-tower distillation way is adopted; acetone which has a lower boiling point is evaporated first; then an isopropanol-water binary azeotrope is separated by extraction distillation; and high-purity acetone and isopropanol are obtained. A second condensation method is used to cool the material flow of a circulating extracting agent, so that high-efficiency used of the material flow is realized; and the heat-integrated way is used to reach a goal of saving energy resources. The method solves the problems of complex process, large energy consumption and low product yield in the prior art, and increases the purity and yield of products.

Description

technical field [0001] The invention belongs to the field of separation and purification in the chemical industry, and in particular relates to a method for separating acetone-isopropanol-water ternary mixture through three-tower heat integration, extraction and rectification. Background technique [0002] Acetone is an important raw material for organic synthesis, used in the production of epoxy resin, polycarbonate, plexiglass, medicine, pesticide, etc. It is also a good solvent, used in coatings, adhesives, acetylene in steel cylinders, etc. Also used as diluent, cleaning agent, extractant. It is also an important raw material for the manufacture of acetic anhydride, diacetone alcohol, chloroform, iodoform, epoxy resin, polyisoprene rubber, methyl methacrylate, etc. It is used as a solvent in industries such as smokeless powder, celluloid, cellulose acetate, and spray paint. It is used as an extractant in oil and other industries. Used in the preparation of plexiglass...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C45/83C07C49/08C07C29/84C07C31/10C07C27/32
CPCC07C29/84C07C45/83C07C49/08C07C31/10Y02P20/10Y02P20/50
Inventor 朱兆友贾慧刘兴振王英龙
Owner 青岛三瑞节能环保技术有限公司
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