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Method for preparing ethanol by hydrogenating acetic acid

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 production cost and high price of ethanol, and achieve long stable operation time of the device and good activity stability , to avoid post-processing effects

Active Publication Date: 2016-06-08
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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  • Method for preparing ethanol by hydrogenating acetic acid
  • Method for preparing ethanol by hydrogenating acetic acid
  • Method for preparing ethanol by hydrogenating acetic acid

Examples

Experimental program
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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 impregnation 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 adsorption water of the catalyst support. Carry out impregnation at room temperature according to the equal volume impregnation method, add 12mL impregnation solution dropwise to 10g carrier, and keep stirring. After the dropwise addition, it was allowed to stand at room temperature for 3 hours, then dried at 90°C for 3 hours; the temperature was programmed to rise to 400°C at a rate of 1°C / min, and calcined for 10 hours. Then, the dried catalyst precursor is loaded into a tubular reactor, with n-pentane as the carbon source, and hydrogen gas is introduced into the reactor at a pressure of 0.1MP...

Embodiment 2

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

[0047] Weigh the porous silica gel carrier of 10g, by 0.65g (2.1987×10 -4 mol) of ammonium metatungstate and distilled water to prepare 12mL impregnation solution, its tungsten concentration is 2.1987×10 -4 mol / mL, the volume of the impregnation solution is equal to the volume of the maximum adsorption water of the catalyst support. Carry out impregnation at room temperature according to the equal volume impregnation method, add 12mL impregnation solution dropwise to 10g carrier, and keep stirring. After the dropwise addition, it was allowed to stand at room temperature for 24 hours, then dried at 60°C for 24 hours; the temperature was programmed to rise to 700°C at a rate of 2°C / min, and calcined for 1 hour. Then, the dried catalyst precursor is loaded into a tubular reactor, with n-pentane as the carbon source, and hydrogen gas is introduced into the reactor at a pressure of 0.5MPa and a mass space velocity of n-pentane...

Embodiment 3

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

[0049] Weigh the porous silica gel carrier of 10g, by 1.3g (4.3974 * 10 -4 mol) of ammonium metatungstate and distilled water to prepare 12mL impregnation 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 adsorption water of the catalyst support. Carry out impregnation at room temperature according to the equal volume impregnation method, add 12mL impregnation solution dropwise to 10g carrier, and keep stirring. After the dropwise addition, it was allowed to stand at room temperature for 6 hours, then dried at 80°C for 12 hours; the temperature was programmed to rise to 650°C at a rate of 5°C / min, and calcined for 4 hours. Then, the dried catalyst precursor is packed into a tubular reactor, with n-pentane as the carbon source, and hydrogen gas is introduced into the reactor at a pressure of 5.0 MPa and a mass space velocity of n-pent...

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Abstract

The invention discloses a method for preparing ethanol by hydrogenating acetic acid. The method comprises the following steps of mixing the acetic acid and hydrogen under the conditions that the temperature is 250 to 400DEG C, the pressure is 0.5 to 10.0MPa, the weight hourly space velocity is 0.2 to 8.0h<-1>, and the feeding mole ratio of the hydrogen to the acetic acid is 1:1 to 20:1; performing contact reaction on a mixture and a loaded transition metal carbide catalyst; hydrogenating the acetic acid to prepare the ethanol. The method disclosed by the invention has the advantages that the process flow is simple, the price of the catalyst is lower, the performance stability of the catalyst is good, and the stable operation time of the device is long; frequent switching operation of reaction and regeneration of a reactor can be avoided, the catalyst can be regenerated, posttreatment of a large amount of waste catalysts can be avoided, and further the influence on the environment is little.

Description

(1) Technical field [0001] The invention relates to a method for hydrogenating acetic acid to produce ethanol, in particular to a method for hydrogenating acetic acid to produce ethanol with a supported transition metal carbide catalyst. (2) Background technology [0002] Ethanol is a high-quality liquid fuel with low sulfur and ash content, similar combustion performance to gasoline, high oxygen content and octane number, complete combustion and low carbon monoxide emissions compared with ordinary gasoline, and the use of ethanol gasoline can significantly To reduce environmental pollution caused by burning gasoline, ethanol is called the "green energy" of the 21st century. With the intensification of the contradiction between oil supply and demand and the increasing pressure on the environment, countries around the world generally pay attention to alternative energy sources, which promotes the development of fuel ethanol. Most of the existing ethanol production technologi...

Claims

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Application Information

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