Method for producing ethanol by hydrogenation of syngas

A technology for producing ethanol and synthesis gas, which is applied in chemical instruments and methods, preparation of hydroxyl compounds, preparation of organic compounds, etc., can solve the problem of low ethanol selectivity and achieve good technical effects

Active Publication Date: 2015-09-09
CHINA PETROLEUM & CHEM CORP +1
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The technical problem to be solved by the present invention is that in the prior art, the product contains acetaldehyde, ethyl acetate, acetic acid and other C 2 Oxygenated compounds lead to the problem of low ethanol selectivity, providing a new method for syngas hydrogenation to ethanol

Method used

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  • Method for producing ethanol by hydrogenation of syngas

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] Dissolve 8 grams of copper nitrate (containing 3 crystal waters) and 28.88 grams of zinc nitrate (containing 6 crystal waters) in 160 ml of absolute ethanol; dissolve 14 grams of oxalic acid in 80 ml of absolute ethanol, the two ethanol The solution was mixed and precipitated under rapid stirring, continued stirring for 2 hours, suction filtered, and the filter cake was dried at room temperature for 2 hours, then baked in an oven at 110°C for 15 hours, and roasted at 400°C for 5 hours to obtain CuO (25%)-ZnO (75% ) Catalyst, tablet molding, take 20-40 mesh for use, number JQ-1.

Embodiment 2

[0021] Dissolve 15 grams of copper nitrate (containing 3 crystal waters), 17.95 grams of zinc nitrate (containing 6 crystal waters), and 2.5 grams of cobalt nitrate (containing 6 crystal waters) in 155 ml of absolute ethanol; 14.16 grams of oxalic acid Dissolve in 81 ml of absolute ethanol, the two ethanol solutions are mixed and precipitated under rapid stirring, continue to stir for 2 hours, filter with suction, dry the filter cake at room temperature for 2 hours, put it in an oven for 15 hours at 110°C, and roast at 400°C for 4 hours , to obtain Cu(47.0%)-Zn(47.0%)-Co(6%) catalyst, press into tablets, take 20-40 meshes for use, code JQ-2.

Embodiment 3

[0023] Dissolve 15 grams of copper nitrate (containing 3 crystal waters), 5.99 grams of zinc nitrate (containing 6 crystal waters), 1.5 grams of ferric nitrate (containing 9 crystal waters), and 1 gram of chromium nitrate (containing 9 crystal waters) in 103 ml of absolute ethanol; 9.56 g of oxalic acid was dissolved in 55 ml of absolute ethanol, the two ethanol solutions were mixed and precipitated under rapid stirring, continued stirring for 2 hours, suction filtered, and the filter cake was dried at room temperature for 2 hours and then placed in an oven. Bake at 110°C for 15 hours, then bake at 400°C for 4 hours to obtain Cu(70.5%)-Zn(23.5%)-Fe(3.7%)-Cr(2.3%) catalyst, press into tablets, take 20-40 meshes for use , No. JQ-3.

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Abstract

The present invention relates to a method for ethanol preparation through synthesis gas hydrogenation, wherein the problem that the product contains acetaldehyde, ethyl acetate, acetic acid and other oxygen-containing C2 compounds so as to cause low ethanol selectivity in the prior art is mainly solved with the present invention. According to the technical scheme, the method comprises the following steps that: a) synthesis gas enters a first reactor, and contacts a first catalyst to produce a first ethanol-containing effluent, and b) the first ethanol-containing effluent enters a second reactor, and contacts a second catalyst to produce an ethanol-containing reaction effluent, wherein the first catalyst is a rhodium base catalyst, and the second catalyst comprises, by weight, 20-80% of copper or an oxide thereof, and 20-80% of at least the one selected from iron, cobalt, zinc, chromium or an oxide thereof, and does not contain a carrier. With the technical scheme, the problem in the prior art is well solved, and the method can be used for industrial production of ethanol preparation through synthesis gas hydrogenation.

Description

technical field [0001] The invention relates to a method for producing ethanol through hydrogenation of synthesis gas. Background technique [0002] Ethanol is an important basic organic chemical raw material and a potential liquid fuel resource. At present, the main methods of producing ethanol are grain, sucrose and other agricultural products fermentation method and ethylene hydration method. These two methods have disadvantages such as high food cost, large waste residue and liquid, and strong corrosion to equipment, so their development is limited. In recent years, from coal to synthesis gas (CO+H 2 ) The preparation of ethanol has received increasing attention: on the rhodium-based catalyst under certain pressure and temperature conditions, acetaldehyde, ethanol, ethyl acetate, acetic acid and other C can be reacted 2 oxygenates, and these C 2 Under the action of the catalyst, the oxygen-containing compound can hydrogenate acetaldehyde, ethyl acetate and acetic aci...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07C31/08C07C29/158C07C29/141C07C29/149
Inventor 宋庆英刘苏
Owner CHINA PETROLEUM & CHEM CORP
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