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Method for producing ethanol and coproducing ethyl acetate with acetic acid

A technology of ethyl acetate and acetic acid, which is applied in the preparation of carboxylic acid esters, chemical instruments and methods, and the preparation of oxygen-containing compounds. It can solve the problems of low conversion rate of acetic acid, etc., and achieve the reduction of separation equipment, short process, and efficient use of heat. Effect

Active Publication Date: 2013-05-22
XINDI ENERGY ENG TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] 2. Existing technical routes and problems
The product is ethanol with a maximum content of 96wt% and

Method used

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  • Method for producing ethanol and coproducing ethyl acetate with acetic acid
  • Method for producing ethanol and coproducing ethyl acetate with acetic acid
  • Method for producing ethanol and coproducing ethyl acetate with acetic acid

Examples

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Embodiment 1

[0082] After gasifying the feedstock containing 98.6wt% acetic acid, 1.2wt% water and the remainder acetaldehyde and the recycle gas at 120 ° C, the concentration obtained by pressure swing adsorption with coke oven gas methanation is 96% (v The hydrogen of / v) is passed into an adiabatic fixed-bed reactor together, and under the action of a catalyst, the reaction generates a crude ethanol product comprising ethanol, acetic acid, water and ethyl acetate, and the reaction is carried out at a reaction temperature of 220° C. and a pressure of 1.8 MPa, The catalyst comprises 0.5wt% platinum, 0.4wt% tin and 1.2wt% nickel supported on a 6 mm calcium metasilicate modified silica-alumina composite support. Unreacted hydrogen is recycled back to the reactor inlet so that at 4021h -1 The molar ratio of total hydrogen to acetic acid at the GHSV (ie gas space velocity) was 5.6:1. Under these conditions, 99.1% of the acetic acid was converted with a selectivity of 75.2% for ethanol, 23.3%...

Embodiment 2

[0091]After gasifying the feed containing 99.2wt% acetic acid, 0.6wt% water and the remaining amount of acetaldehyde and the recycle gas at 120 ° C, the concentration of the purge gas after pressure swing adsorption with coke oven gas methanation is 96% (v / The hydrogen of v) is passed into the adiabatic fixed-bed reactor together, and under the action of the catalyst, the reaction generates crude ethanol products comprising ethanol, acetic acid, water and ethyl acetate, and the reaction is carried out at a reaction temperature of 285° C. and a pressure of 2.0 MPa. The catalyst comprises 0.5wt% platinum and 0.4wt% tin supported on a 6 mm calcium metasilicate modified silica-alumina composite support. Unreacted hydrogen was recycled back to the reactor inlet such that at 9036h -1 The molar ratio of total hydrogen to acetic acid at the GHSV was 8.2:1. Under these conditions, 99.3% of the acetic acid was converted with a selectivity of 92.9% for ethanol, 5.2% for ethyl acetate a...

Embodiment 3

[0100] After the feed containing 97.5wt% acetic acid, 2.0wt% water and the balance of acetaldehyde are gasified with the recycle gas at 118°C, together with the coke oven gas methanation purge gas with a concentration of 97% hydrogen after pressure swing adsorption Pass into an adiabatic fixed-bed reactor, under the action of the following catalyst, react to generate crude ethanol product comprising ethanol, acetic acid, water and ethyl acetate, react at a reaction temperature of 295°C and a pressure of 2.1MPa, the catalyst contains 0.7wt% platinum, 0.6wt% tin and 1.5wt% nickel on a 6 mm calcium metasilicate modified silica-alumina composite support. Unreacted hydrogen was recycled back to the reactor inlet such that at 16220h -1 The molar ratio of total hydrogen to acetic acid at the GHSV was 14.5:1. Under these conditions, 99.6% of the acetic acid was converted with a selectivity of 94.7% for ethanol, 3.5% for ethyl acetate and 0.7% for acetaldehyde. use as figure 1 The p...

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Abstract

The invention relates to a method for producing ethanol and coproducing ethyl acetate by directly hydrogenating acetic acid. The method comprises the steps of introducing acetic acid feed and hydrogen to a reactor, carrying out hydrogenation reaction in the presence of a catalyst, separating the obtained reaction product with a flash tank to obtain a crude product and purifying and refining the crude product to obtain ethanol and ethyl acetate, wherein recycling hydrogen from the upper part of the flash tank carries out countercurrent contact with the acetic acid feed atomized by an atomization injector after being preheated and gasifies the acetic acid feed, then the gasified acetic acid feed is mixed with high-concentration hydrogen to form a gaseous mixed raw material, and the gaseous mixed raw material is preheated before entering the reactor. The method has the beneficial effects that the stream heat is taken full advantage of to optimize heat transfer; the energy consumption is reduced and the equipment investment is saved; and the hydrogen can be obtained through pressure swing adsorption of purge gases obtained after methanation of coke-oven gases, thus solving the problem of hydrogen source. The method can achieve production of ethanol and coproduction of ethyl acetate from acetic acid by a one-step method.

Description

technical field [0001] The invention relates to a method for directly hydrogenating acetic acid to produce ethanol and co-produce ethyl acetate. Background technique 1. Background of the invention [0002] In recent years, oil prices have continued to rise and environmental pressures have become increasingly heavy. Countries around the world are seeking diversified development of energy sources and developing new alternative energy sources, such as wind energy, solar energy, and biomass energy. The fastest-growing biomass energy is fuel ethanol, which is one of the emerging renewable green energy sources. It can be used as a gasoline additive and fuel for internal combustion engines, and has the advantages of high octane number and good antiknock performance. At present, more than 20 countries in the world have promoted and used ethanol gasoline. Most of the existing industrial fuel ethanol production uses corn, wheat and sucrose as raw materials. Although the technology ...

Claims

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Application Information

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IPC IPC(8): C07C27/00C07C31/08C07C29/149C07C67/08C07C69/14
Inventor 蒋建明常俊石张建祥朱攀中高珠苏海兰刘雪飞赵海龙
Owner XINDI ENERGY ENG TECH