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A kind of method of hydrogenation of acetic acid to produce ethanol

A technology for producing ethanol and acetic acid, which is applied in chemical instruments and methods, preparation of hydroxyl compounds, and preparation of organic compounds, etc., can solve the problems of high price and high production cost of ethanol, achieve good activity stability, long stable operation time of the device, The effect of small environmental impact

Active Publication Date: 2017-12-29
ZHEJIANG UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to provide a method for hydrogenation of acetic acid to ethanol, that is, a method for hydrogenation of acetic acid to ethanol with a supported transition metal carbide catalyst, which solves the problem of high ethanol production costs caused by the high price of supported palladium or platinum catalysts question

Method used

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  • A kind of method of hydrogenation of acetic acid to produce ethanol
  • A kind of method of hydrogenation of acetic acid to produce ethanol
  • A kind of method of hydrogenation of acetic acid to produce ethanol

Examples

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Effect test

Embodiment 1

[0044] Example 1: 1%WC / SiO 2 Catalyst preparation

[0045] Weigh 10g of porous silica gel carrier (its specific surface area is 480m 2 / g), from 0.13g (4.3974×10 -5 mol) of ammonium metatungstate and distilled water to prepare 12mL dipping solution, the tungsten concentration is 4.3974×10 -5 mol / mL, the volume of the impregnation solution is equal to the volume of the maximum adsorbed water of the catalyst carrier. Perform room temperature immersion according to an equal volume immersion method, drop 12 mL of immersion solution into 10 g of carrier, and stir continuously. After the dripping is completed, let it stand at room temperature for 3 hours, then dry at 90°C for 3 hours; program the temperature to 400°C at a rate of 1°C / min, and calcinate for 10 hours. Then, the dried catalyst precursor was put into a tubular reactor, and n-pentane was used as a carbon source, and hydrogen was introduced. The pressure was 0.1MPa and the mass space velocity of n-pentane was 0.2h. -1 , Unde...

Embodiment 2

[0046] Example 2: 5% WC / SiO 2 Catalyst preparation

[0047] Weigh 10g of the porous silica gel carrier, which is made up of 0.65g (2.1987×10 -4 mol) of ammonium metatungstate and distilled water to prepare 12mL dipping solution, the tungsten concentration is 2.1987×10 -4 mol / mL, the volume of the impregnation solution is equal to the volume of the maximum adsorbed water of the catalyst carrier. Perform room temperature immersion according to an equal volume immersion method, drop 12 mL of immersion solution into 10 g of carrier, and stir continuously. After the addition is complete, let it stand at room temperature for 24 hours, and dry at 60°C for 24 hours; program the temperature to 700°C at a rate of 2°C / min, and calcinate for 1 hour. Then, the dried catalyst precursor was put into a tubular reactor, and n-pentane was used as a carbon source, and hydrogen was introduced. The pressure was 0.5MPa and the mass space velocity of n-pentane was 0.5h. -1 , Under the condition of volu...

Embodiment 3

[0048] Example 3: 10%WC / SiO 2 Catalyst preparation

[0049] Weigh 10g of porous silica gel carrier, from 1.3g (4.3974×10 -4 mol) of ammonium metatungstate and distilled water to prepare 12mL dipping solution, the tungsten concentration is 4.3974×10 -4 mol / mL, the volume of the impregnation solution is equal to the volume of the maximum adsorbed water of the catalyst carrier. Perform room temperature immersion according to an equal volume immersion method, drop 12 mL of immersion solution into 10 g of carrier, and stir continuously. After the dripping is completed, let it stand at room temperature for 6 hours, and dry at 80°C for 12 hours; program the temperature to 650°C at a rate of 5°C / min, and calcinate for 4 hours. Then, the dried catalyst precursor was put into the tubular reactor, using n-pentane as a carbon source, and passing hydrogen gas at a pressure of 5.0 MPa and a mass space velocity of n-pentane of 2.0 h -1 , Under the condition of the volume ratio of hydrogen to n-...

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Abstract

The invention discloses a method for producing ethanol by hydrogenating acetic acid. The method is as follows: at a temperature of 250-400°C, a pressure of 0.5-10.0 MPa, a mass space velocity of 0.2-8.0 hours-1, and a feed molar ratio of hydrogen to acetic acid Under the condition of 1:1~20:1, mix acetic acid and hydrogen, contact and react with the supported transition metal carbide catalyst, and hydrogenate acetic acid to produce ethanol; the process of the invention is simple, the price of the catalyst is low, and the performance of the catalyst is stable Well, the stable operation time of the device is long, which can avoid the frequent switching operation of reactor reaction and regeneration, the catalyst can be regenerated, can avoid the post-treatment of a large amount of spent catalyst, and has little impact on the environment.

Description

(1) Technical field [0001] The invention relates to a method for preparing ethanol by hydrogenating acetic acid, in particular to a method for preparing ethanol by hydrogenating acetic acid with a supported transition metal carbide catalyst. (2) Background technology [0002] Ethanol is a high-quality liquid fuel with low sulphur and ash content. Its combustion performance is similar to that of gasoline. It has a higher oxygen content and octane number. It burns completely and has lower carbon monoxide emissions than ordinary gasoline. The use of ethanol gasoline can significantly To reduce environmental pollution caused by burning gasoline, ethanol is called the "green energy" in the 21st century. As the contradiction between oil supply and demand has intensified and environmental pressure has become increasingly heavier, countries around the world are generally concerned about alternative energy sources, which has promoted the development of fuel ethanol. Most of the existing ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07C31/08C07C29/149B01J27/22
CPCY02P20/584
Inventor 任杰金辉
Owner ZHEJIANG UNIV OF TECH
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