Method for simplifying rectification process for preparing ethanol through hydrogenation of acetic acid

A technology for producing ethanol and ethyl acetate, which is applied in chemical instruments and methods, organic chemistry, preparation of hydroxyl compounds, etc., can solve the problems of insufficient downstream application and excess capacity of downstream acetic acid, and achieve the effect of saving equipment investment

Active Publication Date: 2012-04-04
SOUTHWEST RES & DESIGN INST OF CHEM IND
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Problems solved by technology

[0011] At the same time, Southwest Chemical Industry Research and Design Institute invented a method of hydrogenating ethyl acetate to produce ethanol (CN 201010584928.0). This method uses ethyl acetate or methyl acetate as a raw material and hydrogenates it under the action of a copper-based catalyst to generate ethanol. Method Invented the production process route of producing ethanol from coal as raw material, which solved the problems of overcapacity and insufficient downstream application of coal-based methanol and downstream acetic acid in my country

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  • Method for simplifying rectification process for preparing ethanol through hydrogenation of acetic acid
  • Method for simplifying rectification process for preparing ethanol through hydrogenation of acetic acid

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Embodiment 1

[0033] Embodiment 1: (instructions attached figure 1 )

[0034] In the production process of ethyl acetate, the raw materials ethanol and acetic acid are added from the tower tank of the esterification tower, and the reaction is carried out under the catalysis of sulfuric acid circulating in the tower tank. The reaction products are ethyl acetate, water, and a small amount of low-ester and unreacted by-products. The finished small amount of ethanol and acetic acid are distilled from the top of the tower, and after condensation, they are stratified in the reflux tank of the esterification tower. The water phase is extracted and processed in the waste water recovery tower. Thin tower.

[0035] The oil phase material extracted from the top of the esterification tower is fed from the top of the enrichment tower, and after being separated by rectification, the crude ethyl acetate product from the bottom of the tower, which has removed low-ester, ethanol and most of the water, ente...

Embodiment 2

[0039] Embodiment 2: (instructions attached figure 2 )

[0040] In the production process of ethanol, the raw material ethanol and acetic acid are added from the tower tank of the esterification tower, and the reaction is carried out under the catalysis of sulfuric acid circulating in the tower tank. The reaction products are ethyl acetate, water, a small amount of low-ester and unreacted by-products A small amount of ethanol and acetic acid are evaporated from the top of the tower, and after condensation, they are stratified in the reflux tank of the esterification tower. The water phase is extracted and processed in the waste water recovery tower. The oil phase is partially refluxed to the top of the esterification tower, and ethyl acetate is partially extracted. In the gasification tower of the hydrogenation section, the oil phase produced is a crude product of ethyl acetate, of which the content of ethyl acetate is 90.0%-92.0% (mass percentage).

[0041]The oil phase mat...

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Abstract

The invention discloses a method for simplifying a rectification process for preparing ethanol through hydrogenation of acetic acid. An extractive distillation mode is adopted, and an ethanol product with higher purity can be obtained; a rectifying device can meet the separation requirement on an acetic ether product and an ethanol product; in addition, the acetic ether and the ethanol are separated by the same separation equipment; when the ethanol is produced, crude acetic ether and absolute ethanol products are obtained in the device, and when the ethanol is not produced, the device can produce the qualified acetic ether product, so that the device investment is saved.

Description

technical field [0001] The invention relates to product refining in the organic chemical industry, in particular to a method for simplifying the rectification process of hydrogenation of acetic acid to ethanol. Background technique [0002] Ethanol, commonly known as alcohol, is a flammable, volatile, colorless and transparent liquid at normal temperature and pressure. Its aqueous solution has a special, pleasant fragrance and is slightly irritating. Ethanol has a wide range of uses. Ethanol can be used to make acetic acid, beverages, flavors, dyes, fuels, etc. Ethanol with a volume fraction of 70%-75% is also commonly used as a disinfectant in medical treatment. [0003] In industry, ethanol is generally produced by starch fermentation method or ethylene direct hydration method: [0004] 1. fermentation method [0005] Fermentation ethanol was developed on the basis of brewing wine, and it was the only industrial method for producing ethanol in a long historical p...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C31/08C07C29/149C07C29/80
Inventor 毛震波温少桦吴路平王科胡玉蓉曾健廖炯郑珩胡文励
Owner SOUTHWEST RES & DESIGN INST OF CHEM IND
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