Method for preparing ethyl alcohol by acetic acid hydrogenation

A technology for hydrogen production and ethanol, which is applied in the field of acetic acid hydrogenation to produce ethanol, can solve the problem of low ethanol selectivity, achieve high ethanol selectivity, high acetic acid conversion rate, and good technical effects

Active Publication Date: 2016-04-20
SHANGHAI HUAYI GRP CO
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0010] The technical problem to be solved by the present invention is the problem of low ethanol selectivity in the prior art, and a new method for preparing ethanol by hydrogenating acetic acid is provided

Method used

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  • Method for preparing ethyl alcohol by acetic acid hydrogenation

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] in such as figure 1In the process flow shown, the acid hydrogenation reactor is a multi-stage fixed bed with three stages of catalyst beds, and the inert material alumina ceramic balls are filled between the beds. The raw material of acetic acid is divided into three strands. The first strand of acetic acid is mixed with hydrogen and vaporized, then enters the acid hydrogenation reactor, and contacts with catalyst I to generate product A containing ethanol and ethyl acetate; Two feed ports in the axial direction of the hydrogenation reactor enter the acid hydrogenation reactor, and the two feed ports are located on the inert material filling area in the acid hydrogenation reactor. The reaction product of the acid hydrogenation reactor directly enters the ester hydrogenation reactor after exchanging heat with the raw material, and the product B of the ester hydrogenation reactor enters the gas-liquid separation tank, and is separated to obtain two phases of gas and liqui...

Embodiment 2

[0038] According to the conditions and steps described in Example 1, the acid hydrogenation reactor catalyst I is a supported platinum metal carrier composite, wherein the supported metals are 1wt% Ru, 1.5wt% Sn, 0.5wt% Ca, 0.5% Re. The acid hydrogenation reactor is a tubular fixed-bed reactor, the catalyst I packing quality is 300g, the feed is hydrogen with a purity of 99.7wt% acetic acid and a purity of 99.8%, and the hydrogen-acid ratio of the entire reaction system is 50:1 , the inlet temperature of the catalytic bed is 280°C, the reaction pressure is 3.5MPa, and the hourly space velocity of the reaction liquid is 1.0h -1 .

[0039] The volume of the ester hydrogenation reactor is 1 / 3 of that of the acid hydrogenation reactor, wherein the catalyst II is a copper-loaded or copper oxide support composite, and the loading quality of the catalyst II is 100g. The inlet temperature of the catalytic bed of the reactor is 200°C, the reaction pressure is 3.44MPa, and the hourly s...

Embodiment 3

[0041] According to the conditions and steps described in Example 1, the acid hydrogenation reactor catalyst I is a supported platinum metal carrier composite, wherein the supported metals are 1wt% Pt, 1.5wt% Sn, 0.5wt% Ca, 0.5% Cu. The acid hydrogenation reactor is a tubular fixed-bed reactor, and the loading quality of the catalyst I is 300g. The feed materials are acetic acid with a purity of 99.7wt% and hydrogen with a purity of 99.8%, and the hydrogen-acid ratio of the entire reaction system is 50:1. The inlet temperature of the catalytic bed of the reactor is 250°C, the reaction pressure is 3.5MPa, and the hourly space velocity of the reaction liquid is 1.0h -1 .

[0042] Catalyst II of the ester hydrogenation reactor does not contain copper or copper oxide carrier complex, the inlet temperature of the catalytic bed of the reactor is 200°C, the reaction pressure is 3.44MPa, and the hourly space velocity of the reaction liquid is 1.0h -1 , the hydrogen ester molar ratio...

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Abstract

The invention relates to a method for preparing ethyl alcohol by acetic acid hydrogenation and mainly solves the problem that ethyl alcohol selectivity in the prior art is low. By using the method for preparing the ethyl alcohol by acetic acid hydrogenation, two flows or multiple flows of acetic acid material enter various hydrogenation reaction stages, acetic acid liquid feeding or acetic acid partial liquid feeding is among the reaction stages, the temperature rise of an acid hydrogenation reactor catalyst bed is effectively controlled, direct heat exchange cooling and material supplementing are enabled, hydrogen acid ratio of an acetic acid hydrogenation reaction system is greatly reduced with each reaction area high in hydrogen acid ratio, and a technical scheme ensuring high ethyl alcohol selectivity well solves the above problems and is applicable to the preparation of ethyl alcohol by acetic acid hydrogenation.

Description

technical field [0001] The invention relates to a method for preparing ethanol by hydrogenating acetic acid. Background technique [0002] Acetic acid is an important chemical raw material, mainly used in the production of acetate, vinyl acetate, acetic anhydride, cellulose acetate, etc. In industry, coal-to-synthesis gas to produce methanol and carbonylation to produce acetic acid are very mature, and the acetic acid industry is booming. In 2013, the production capacity of acetic acid reached 7.05 million tons per year. Due to overcapacity and insufficient demand, the price of acetic acid has been low since 2008. hovering. The process of direct hydrogenation of acetic acid to ethanol can digest part of the production capacity of acetic acid, solve the problem of overcapacity of acetic acid, develop its downstream industrial chain, improve the added value of products and the ability to resist market risks; in the long run, the final product of this process is coal-based cle...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C29/149C07C31/08
CPCC07C29/149C07C31/08
Inventor 于小芳陈海俊王振兴张新平
Owner SHANGHAI HUAYI GRP CO
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