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Process method for rectifying ethanol with three-tower heat integration

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: 2016-01-20
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, and after rough distillation , The bottom of the tower obtains the waste mash I, the top of the tower obtains the crude wine stream I with the ethanol content of 40%, the crude wine stream I is condensed by the second-stage preheater heat exchange; the second part of the raw material liquid enters the upper part of the rectification tower II After the crude distillation, waste mash II is obtained from the bottom of the tower, and crude wine stream II with an ethanol content of 40% is obtained from the top of the tower. The crude wine stream II enters the second reboiler of rectification tower I for heat exchange and condensation. The condensed crude wine stream I and crude wine stream II are combined and enter the lower part of r...

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 preheated and divided into the first and second parts, the weight ratio of the first and second parts is 1:1, and the rectification tower The azeotropic ethanol stream obtained at the top of the column III 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 tower I is 25, the feed position is the second tray from top to bottom, the operating pressure is 41kPa, the top temperature is 72°C, and the bottom temperature is 86.5°C. The number of trays in the rectification tower II is 27, the feed position is the second tray from top to bottom, the operating pressure is 151kPa, the top temperature is 105°C, the bottom temperature is 115°C, and the rectification tower III tray The number is 65, the feeding position is the 60th tray from top to bottom, the ...

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 preheated and divided into the first and second parts. The weight ratio of the first and second parts is 0.9:1. The azeotropic ethanol stream obtained at the top of the column III is divided into two parts, the first part accounts for 70% and the second part accounts for 30%.

[0028] The number of trays in the rectification tower I is 26, the feed position is the second tray from top to bottom, the operating pressure is 51kPa, the top temperature is 77.2°C, and the bottom temperature is 89.7°C. The number of trays in the rectification tower II is 27, the feed position is the second tray from top to bottom, the operating pressure is 170kPa, the top temperature is 108.6°C, the bottom temperature is 117.4°C, the rectification tower III tray The number is 65, the feed position is the 60th tray from top to bottom, the operating pressure is 501kPa, 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 three-tower heat integrated distillation process for ethanol. Background technique [0002] With the increasing shortage of petroleum resources, environmental pollution, greenhouse effect and other problems, fuel ethanol, as a kind of energy that has little environmental pollution and can replace petroleum, has received extensive attention. As an alternative to gasoline, fuel ethanol emits a certain amount of energy. The energy consumption for producing fuel ethanol must be much less than the energy released by combustion, otherwise the promotion 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 for producing fuel ethanol is mainly concentrated in the distillation dehydration section, and reducing the energy consumption of the distillation dehydration section is the key. Although the current production ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
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