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Three-tower heat integrated distillation process of ethanol

A process method and heat integration technology, applied in chemical instruments and methods, preparation of organic compounds, organic chemistry, etc., can solve problems such as high technical energy consumption and unreasonable heat integration

Active Publication Date: 2014-09-03
SINOPEC SHANGHAI ENG +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The technical problem to be solved by the present invention is the problem of high energy consumption and unreasonable heat integration in the prior art, and a new process method for rectifying ethanol with three-tower heat integration is provided

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] The raw material liquid with an ethanol content of 5% by weight is preheated and divided into the first and second parts. The weight ratio of the first and second parts is 0.95:1. The first part enters the upper part of the rectification tower I. After rough distillation , the waste mash I is obtained in the bottom of the tower, and the crude wine stream I with an ethanol mass content of 40% is obtained at the top of the tower, and the crude wine stream I is heat-exchanged and condensed by the secondary preheater; the second part of the raw material liquid enters the upper part of the rectification tower II , after crude distillation, waste mash II is obtained in the tower kettle, crude wine stream II with an ethanol mass content of 40% is obtained at the top of the tower, and the crude wine stream II enters the second reboiler of the rectification column I tower kettle for heat exchange and condensation. The condensed crude wine stream I and crude wine stream II merge a...

Embodiment 2

[0024] According to the conditions and steps described in Example 1, the raw material liquid with an ethanol content of 5% by weight is divided into the first and second parts after preheating, and the weight ratio of the first and second parts is 1:1. The azeotropic ethanol stream obtained at the top of the III column is divided into two parts, the first part accounts for 72.2% and the second part accounts for 27.8%.

[0025]The number of trays in the rectification column I is 25, the feed position is at the second tray from top to bottom, the operating pressure is 41kPa, the temperature at the top of the tower is 72°C, and the temperature at the bottom of the tower is 86.5°C. The number of trays in the rectification tower II is 27, the feeding position is at the second tray from top to bottom, the operating pressure is 151kPa, the temperature at the top of the tower is 105°C, and the temperature at the bottom of the tower is 115°C. The number is 65, the feed position is at t...

Embodiment 3

[0027] According to the conditions and steps described in Example 1, the raw material liquid with an ethanol content of 5% by weight is divided into the first and second parts after preheating, and the weight ratio of the first and second parts is 0.9:1. The azeotropic ethanol stream obtained at the top of the III tower is divided into two parts, the first part accounts for 70% of the proportion, and the second part accounts for 30% of the proportion.

[0028] The number of trays in the rectification column I is 26, the feeding position is at the second tray from top to bottom, the operating pressure is 51kPa, the temperature at the top of the tower is 77.2°C, and the temperature at the bottom of the tower is 89.7°C. The number of trays in the rectification tower II is 27, the feed position is at the second tray from top to bottom, the operating pressure is 170kPa, the temperature at the top of the tower is 108.6°C, and the temperature at the bottom of the tower is 117.4°C. Th...

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PUM

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Abstract

The invention relates to a three-tower heat integrated distillation process of ethanol and mainly solves the problems of high power consumption and unreasonable heat integration in the prior art. The three-tower heat integrated distillation process of ethanol disclosed by the invention mainly comprises the following steps: (1) preheating a feedstock solution containing ethanol, enabling a part of the feedstock solution to enter a distillation tower I and a part of the feedstock solution to enter a distillation tower II, thus obtaining a crude ethanol stream I from the top of the distillation tower I and a waste fermented liquid I from the bottom of the distillation tower I as well as a crude ethanol stream II from the top of the distillation tower II and a waste fermented liquid II from the bottom of the distillation tower II; and (2) mixing the crude ethanol stream I and the crude ethanol stream II, feeding into a distillation tower III, thus obtaining an azeotropic ethanol stream from the top of the distillation tower III and a refined bottom liquid from the bottom of the distillation tower III. The problems can be well solved by the technical scheme, and the three-tower heat integrated distillation process can be used for distilling ethanol.

Description

technical field [0001] The invention relates to a process method for rectifying ethanol with three-tower heat integration. Background technique [0002] With the increasingly serious shortage of petroleum resources, environmental pollution, and greenhouse effect, fuel ethanol, as an energy source that has little environmental pollution and can replace petroleum, has received widespread attention. Fuel ethanol is a substitute fuel for gasoline, and the energy released by combustion is certain. The energy consumption for producing fuel ethanol must be far less than the energy released by combustion, otherwise the popularization and use of fuel ethanol will be restricted. Therefore, the production of fuel ethanol The problem of energy saving is becoming more and more prominent, and the energy consumption of producing fuel ethanol is mainly concentrated in the distillation and dehydration section, so reducing the energy consumption of the distillation and dehydration section is ...

Claims

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Application Information

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IPC IPC(8): C07C31/08C07C29/80
CPCC07C29/80C07C31/08
Inventor 许天宇缪晡陈栋丁伟军罗翔明
Owner SINOPEC SHANGHAI ENG