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Energy-saving process for separation of ethyl acetate-ethanol by pressure swing rectification with side draw

A technology for ethyl acetate and sideline extraction, which is applied in the field of rectification and purification, can solve the problems of high separation energy consumption, complicated operation, difficult separation, etc., and achieves the effects of reducing energy consumption and equipment investment costs.

Active Publication Date: 2021-05-14
QINGDAO UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] The invention provides an energy-saving process for separating ethyl acetate-ethanol by pressure swing rectification with side line extraction, and solves the problem of difficult separation of ethyl acetate-ethanol mixture due to azeotropy. Compared with other methods, the process saves equipment Investment cost, high product separation purity, no environmental pollution, and reduced energy consumption
[0011] The present invention aims at the present situation of high separation energy consumption and complex operation of the binary azeotropic mixture in the process of pressure swing rectification, and provides an energy-saving process for separating ethyl acetate-ethanol by pressure swing rectification with side line extraction

Method used

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  • Energy-saving process for separation of ethyl acetate-ethanol by pressure swing rectification with side draw
  • Energy-saving process for separation of ethyl acetate-ethanol by pressure swing rectification with side draw
  • Energy-saving process for separation of ethyl acetate-ethanol by pressure swing rectification with side draw

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Experimental program
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Effect test

Embodiment 1

[0028] Attached figure 1 In the process flow diagram shown, the feed flow rate is 6000kg / h, the feed temperature is 32°C, and the feed composition is 65.7% (mass fraction) of ethyl acetate and 34.3% (mass fraction) of ethanol. The theoretical plate number of the high-pressure distillation column is 45, the pressure is 6.0atm (absolute pressure), the feed is from the 27th plate, the circulating feed position is the 35th plate, the side line extraction position is the 22nd plate, and the reflux The ratio is 1.6; the number of theoretical plates of the low-pressure rectification tower is 25, the pressure is 0.5 atm (absolute pressure), the feed is fed from the 15th tray, the feed position of the side line extraction is the 9th tray, and the reflux ratio is 0.9. After separation, the ethyl acetate product concentration is 99.97%, and the recovery rate is 99.95%, and the ethanol product concentration is 99.94%, and the recovery rate is 99.91%.

[0029] Table 1 Distillation column ...

Embodiment 2

[0038] Attached figure 1 In the process flow diagram shown, the feed flow rate is 6700kg / h, the feed temperature is 32°C, and the feed composition is 70% (mass fraction) of ethyl acetate and 30% (mass fraction) of ethanol. The theoretical plate number of the high-pressure distillation column is 50, the pressure is 6.5atm (absolute pressure), the feed is from the 29th plate, the circulating feed position is the 37th plate, the side line extraction position is the 24th plate, and the reflux The ratio is 1.7; the number of theoretical plates of the low-pressure rectification column is 28, the pressure is 0.8 atm (absolute pressure), the feed is from the 17th plate, the feed position of the side line is the 10th plate, and the reflux ratio is 1.0. After separation, the ethyl acetate product concentration is 99.96%, and the recovery rate is 99.92%, and the ethanol product concentration is 99.97%, and the recovery rate is 99.94%.

[0039] Table 4 Distillation column information tab...

Embodiment 3

[0047] Attached figure 1In the process flow diagram shown, the feed flow rate is 7000kg / h, the feed temperature is 32°C, and the feed composition is 50% (mass fraction) of ethyl acetate and 50% (mass fraction) of ethanol. The theoretical plate number of the high-pressure rectification tower is 55, the pressure is 8.0atm (absolute pressure), the feed is from the 31st plate, the circulating feed position is the 40th plate, the side line extraction position is the 26th plate, and the reflux The ratio is 1.8; the number of theoretical plates of the low-pressure rectification tower is 30, the pressure is 1.0atm (absolute pressure), the feed is fed from the 18th tray, the feed position of the side line is the 12th tray, and the reflux ratio is 1.2. After separation, the ethyl acetate product concentration is 99.98%, and the recovery rate is 99.95%, and the ethanol product concentration is 99.98%, and the recovery rate is 99.94%.

[0048] Table 7 Distillation column information tabl...

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Abstract

The invention relates to an energy-saving process for separating ethyl acetate-ethanol through pressure swing rectification with side line extraction, and belongs to the field of rectification and purification in the chemical industry. The process utilizes side line extraction to carry out pressure swing rectification to separate ethyl acetate and ethanol. The mixture of ethyl acetate and ethanol to be separated enters the high-pressure rectification tower from the 27-31st plate, and ethyl acetate is extracted from the bottom of the tower. The extracted mixture enters the low-pressure rectification tower. At the same time, a certain amount of ethyl acetate and ethanol mixture is extracted from the side line of the 22-26th plate of the high-pressure rectification tower and enters the low-pressure rectification tower. The ethanol is extracted from the bottom of the low-pressure rectification tower. The extracted ethyl acetate-ethanol mixture is recycled to the high-pressure rectification column. By introducing a side line process between the two towers of pressure swing rectification, the product purity is improved while greatly reducing energy consumption. The product mass fractions of the present invention are all above 99.9%. The invention has the advantages of energy saving and environmental protection, high purity of separated products, simple process and the like.

Description

【Technical field】 [0001] The invention belongs to the field of rectification and purification in the chemical industry, and in particular relates to an energy-saving process for separating ethyl acetate-ethanol through pressure-swing rectification with side-line extraction. 【Background technique】 [0002] Ethyl acetate is a fine chemical product with a wide range of uses. It has excellent solubility and quick-drying properties and is widely used. It is a very important organic chemical raw material and an excellent industrial solvent. It is widely used in cellulose acetate, ethyl acetate In the production process of base fiber, chlorinated rubber, vinyl resin, cellulose acetate resin, synthetic rubber, paint and paint, etc. [0003] At present, the method for producing ethyl acetate is mainly the ethyl acetate esterification method, and the productive rate of ethyl acetate is improved by adding excessive ethanol, and excessive ethanol forms azeotrope with ethyl acetate under...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07C67/54C07C69/14C07C29/80C07C31/08
CPCC07C29/80C07C67/54C07C69/14C07C31/08Y02P20/10
Inventor 武玉民孟大朋朱兆友王英龙崔培哲
Owner QINGDAO UNIV OF SCI & TECH
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