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Method for producing ethanol through acetic acid esterification-hydrogenation

A technology of acetic esterification and ethyl acetate, applied in chemical instruments and methods, preparation of organic compounds, organic chemistry, etc., to achieve good technical effects, flexible selection of product specifications, and reduced energy consumption.

Inactive Publication Date: 2013-11-13
SHANGHAI HUAYI GRP CO
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0012] The technical problem to be solved by the present invention is that there are problems in the prior art that do not involve the entire large process of acetic esterification, ethyl ester hydrogenation, and ethanol refining, and that ethyl ester hydrogenation can only be carried out when the hydrogen ester ratio is high. A new method of acetification-hydrogenation to produce ethanol

Method used

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  • Method for producing ethanol through acetic acid esterification-hydrogenation
  • Method for producing ethanol through acetic acid esterification-hydrogenation
  • Method for producing ethanol through acetic acid esterification-hydrogenation

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] [embodiment 1] produce ethyl acetate

[0027] If the production of ethyl acetate is the goal, the esterification unit operates at full load, the hydrogenation unit operates at 50% load, and the crude ethanol obtained by hydrogenation can directly go to the esterification tower without separation. At this point the process flow is as follows:

[0028]Stream 1 is ethanol, stream 2 is acetic acid, D6 is an esterification tank, T1 is an esterification tower, the tower still temperature of the esterification tower is 101 ℃, the tower still pressure is 20kPa in terms of gauge pressure, and the temperature in the tower is 75 ℃, The temperature at the top of the column was 71°C. In the reaction kettle of the esterification tower, with 98% concentrated sulfuric acid as a catalyst, ethanol and acetic acid undergo esterification reaction to generate ethyl acetate and water. Stream 3 is ethyl acetate, water and ethanol, which are azeotroped to the top condenser H1 to condense , a...

Embodiment 2

[0034] [Example 2] Production of Industrial Ethanol

[0035] If the goal is to produce industrial ethanol, the crude ester can be directly used as the raw material of the hydrogenation unit without refining. At this point the process flow is as follows:

[0036] Stream 1 is ethanol, stream 2 is acetic acid, D6 is an esterification tank, T1 is an esterification tower, the tower still temperature of the esterification tower is 110 ℃, the tower still pressure is 28kPa in terms of gauge pressure, and the temperature in the tower is 76 ℃, The temperature at the top of the column was 72°C. In the reaction kettle of the esterification tower, with 98% concentrated sulfuric acid as a catalyst, ethanol and acetic acid undergo esterification reaction to generate ethyl acetate and water. Stream 3 is ethyl acetate, water and ethanol, which are azeotroped to the top condenser H1 to condense , after being cooled by the condenser, the stream 4 is obtained, which enters the liquid-liquid sep...

Embodiment 3

[0042] [Example 3] Production of absolute ethanol

[0043] If the production of absolute ethanol is the goal, the crude ester is refined to obtain the refined ester, which is used as the raw material of the hydrogenation unit. At this point the process flow is as follows:

[0044] Stream 1 is ethanol, stream 2 is acetic acid, D6 is an esterification kettle, T1 is an esterification tower, the tower still temperature of esterification tower is 106 ℃, the tower still pressure is 20kPa in gauge pressure, and the temperature in the tower is 74 ℃, The temperature at the top of the column was 70°C. In the reaction kettle of the esterification tower, with 98% concentrated sulfuric acid as a catalyst, ethanol and acetic acid undergo esterification reaction to generate ethyl acetate and water. Stream 3 is ethyl acetate, water and ethanol, which are azeotroped to the top condenser H1 to condense , after being cooled by the condenser, the stream 4 is obtained, which enters the liquid-li...

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Abstract

The invention relates to a method for producing ethanol through acetic acid esterification-hydrogenation, which mainly solves the problems in the prior art that the whole flow of acetic acid esterification, ethyl ester hydrogenation and ethanol refining is not involved and ethyl ester hydrogenation only can be performed under the condition of high hydrogen ester content. The method for producing the ethanol through acetic acid esterification-hydrogenation comprises the following steps: (1) reacting ethanol with acetic acid to obtain a mixture containing ethyl acetate and water, performing azeotropic treatment to reach a condenser on the top of an esterification tower, then entering a separator for separating out water, and separating impurities out of coarse ester to obtain ethyl acetate; (2) enabling hydrogen and vaporized ethyl acetate to come into contact with a copper-containing catalyst in a reactor so as to perform hydrogenation reaction to obtain ethanol-containing fluid, and performing high-pressure gas liquid separation and low-pressure gas liquid separation to obtain coarse ethanol; and (3) separating the ethanol by using a light component removing tower and a heavy component removing tower to obtain an industrial ethanol or absolute ethanol product. According to the technical scheme, the problems in the prior art are solved well, and the method can be applied to production of the ethanol through acetic acid esterification-hydrogenation.

Description

technical field [0001] The invention relates to a method for producing ethanol through acetic esterification-hydrogenation. Background technique [0002] Ethanol is one of the basic industrial raw materials, widely used in food, chemical industry, military industry, medicine and other fields: (1) disinfectant; (2) beverage and food; (3) basic chemical raw materials, can produce acetaldehyde, ether, acetic acid Ethyl ester, ethylamine and other chemical raw materials are also raw materials for the production of dyes, paints, detergents and other products; (4) Thinners, organic solvents, paint solvents, etc.; (5) Ethanol is also a non-polluting high-octane As a gasoline additive, as a vehicle fuel, ethanol can be transferred into gasoline. [0003] At present, the production process of ethanol in industry mainly adopts two methods: starch sugar fermentation method and ethylene direct hydration method. Among them, ethanol produced by fermentation of starch and sugar accounts ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C31/08C07C29/149
Inventor 张新平蔡清白高振明程双张金忠孙帆邵峰唐勇张春雷
Owner SHANGHAI HUAYI GRP CO
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