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Method for preparing azeotropic ethanol through three-tower triple-effect differential pressure heat integration

A technology of heat integration and azeotropy, applied in chemical instruments and methods, preparation of hydroxyl compounds, preparation of organic compounds, etc., can solve the problem of high energy consumption, achieve energy saving and good technical effects

Active Publication Date: 2011-07-20
CHINA PETROCHEMICAL CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The technical problem to be solved by the present invention is that there is a problem of high energy consumption in the prior art, and a new three-tower three-effect differential pressure heat integration method for preparing azeotropic ethanol is provided

Method used

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  • Method for preparing azeotropic ethanol through three-tower triple-effect differential pressure heat integration
  • Method for preparing azeotropic ethanol through three-tower triple-effect differential pressure heat integration
  • Method for preparing azeotropic ethanol through three-tower triple-effect differential pressure heat integration

Examples

Experimental program
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Effect test

Embodiment 1

[0031] use figure 2 As shown in the flow process, the fermented mash 1 with an ethanol content of 9% by weight first exchanges heat with the waste mash 2, then exchanges heat with the crude wine gas 3, and then enters the upper part of the crude distillation tower (T101). After crude distillation, the tower The kettle obtains waste mash 2 with an ethanol content of less than 0.005% by weight, and the top of the tower obtains crude alcohol gas 3 with an ethanol content of 48% by weight. Wine condensate 4, noncondensable gas 5 is discharged out of bounds. The first reboiler (E101) of the crude distillation column is heated by the absolute ethanol gas 21 from the molecular sieve dehydration unit, the second reboiler (E102) of the crude distillation column is heated by the stream 7, and the gas from the flash tank 13 The flash gas 15 and the flash gas 17 from the flash tank 14 enter the crude distillation tower to directly heat the crude distillation tower.

[0032] The crude w...

Embodiment 2～4

[0038] use figure 2 In the flow shown, only the operating conditions of each column are changed. The specific operating conditions and steam consumption are shown in Table 1.

[0039] Table 1

[0040]

[0041] *The operating conditions of the first reboiler and the second reboiler of the crude distillation column are the same.

Embodiment 5

[0043] According to the steps of [Example 1], only the non-condensable gas enters the subsequent absorption section.

[0044] The number of trays in the crude distillation column is 26, the feeding position is the second tray from top to bottom, the operating pressure is 40kPa, the temperature at the top of the column is 60°C, and the temperature at the bottom of the column is 81°C. Refining column I tray number is 50, feed position is the 48th tray, operating pressure is 130kPa, tower top temperature is 85 ℃, and tower still temperature is 92 ℃. The number of trays in the finishing column III is 68, the feeding position is the 60th tray from top to bottom, the operating pressure is 500kPa, the temperature at the top of the tower is 125°C, and the temperature at the bottom of the tower is 153°C. The steam consumption is 1.2 tons of steam / ton of azeotropic ethanol product, and the energy consumption of each ton of azeotropic ethanol product can be saved by 25% compared with [Co...

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Abstract

The invention relates to a method for preparing azeotropic ethanol through three-tower triple-effect differential pressure heat integration and mainly solves the problem of high energy consumption in the prior art. The method is realized in the following heating modes that: a first reboiler in the kettle of a rough distillation tower is heated by absolute ethanol gas 21 from a molecular sieve dehydration unit; a second reboiler in the kettle of the rough distillation tower is heated by a material fluid 7 from the top of a rectifying tower I; flash vapor 15 from a flash evaporation tank 13 andflash vapor 17 from a flash evaporation tank 14 enter the rough distillation tower to directly heat the rough distillation tower; a reboiler in the kettle of a rectifying tower is heated by a material fluid 10 from the top of a rectifying tower II; and a reboiler in the kettle of the rectifying tower II is heated by primary vapor 19 from the outside. By the technical scheme, the problem is preferably solved; and the method can be applied to an industrial production process for preparing the azeotropic ethanol through three-tower triple-effect differential pressure distillation.

Description

technical field [0001] The invention relates to a method for preparing azeotropic ethanol through three-tower and three-effect differential pressure heat integration. Background technique [0002] With the increasing shortage of petroleum resources and the urgent need to improve the deterioration of the natural environment, fuel ethanol, as a kind of energy that has little environmental pollution and can replace petroleum, has attracted the attention of various countries. 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 issue of energy saving is becoming more and more prominent. However, the energy consumption of producing fuel ethanol is mainly concentrated in the distillation dehydration section, and r...

Claims

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Application Information

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IPC IPC(8): C07C31/08C07C29/80
Inventor 韩飞丁伟军林长骏缪晡石荣华
Owner CHINA PETROCHEMICAL CORP
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