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Preparation method used for cyanobenzene direct atmospheric hydrogenation catalyst

A technology of catalyst and benzonitrile, which is applied in the field of catalyst preparation for direct hydrogenation of benzonitrile at atmospheric pressure, can solve the problem that the catalyst is not suitable for fixed-bed continuous reaction, and achieve simple preparation method, high hydrogenation conversion rate and catalytic activity high effect

Inactive Publication Date: 2018-07-13
LANZHOU UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

On the other hand, domestic and foreign researchers have focused on the application of various catalysts in the catalytic hydrogenation of benzonitrile, all of which are focused on batch reactions in tanks, and the obtained catalysts are not suitable for continuous reactions in fixed beds.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] Embodiment one, with Na 2 CO 3 and NaOH as precipitant to prepare catalyst

[0018] Method 1: Take a flask, add 74g of calcium hydroxide and a certain amount of water to dissolve it completely, take 53g of Na 2 CO 3 Prepare a 5mol / L aqueous solution, add it to the calcium hydroxide solution and mix well. Then take 60gCo(NO 3 ) 2 ·6H 2 O, 20g Ni(NO 3 ) 2 ·6H 2 O, 10gCu(NO 3 ) 2 ·6H 2 O, 10gFe(NO 3 ) 2 9H 2 O, 10g (NH 4 ) 6 Mo 7 o 24 4H 2 O, 10gMn(NO 3 ) 2 4H 2 O,10g Zn(NO 3 ) 2 ·6H 2 O, 10gCr(NO 3 ) 3 9H 2 O Add a certain amount of water and stir to dissolve completely. Add the mixed metal salt solution dropwise to the above mixed solution, the solution turns from white suspension to dark green, adjust the pH value of the mixed solution to 14 with 1 mol / L sodium hydroxide solution. During this process, the temperature was kept at 70°C, and the solution was stirred for 14 hours. The solution turned from a dark green suspension to a brown colo...

Embodiment 2

[0020] Embodiment two, prepare catalyst with ammoniacal liquor, ammonium bicarbonate mixed solution precipitation agent

[0021]Also adopt reverse addition and addition, the amount of metal salt and calcium hydroxide remains constant. The specific method is as follows:

[0022] Method 1. Take a flask, add 74g of calcium hydroxide and a certain amount of water to completely dissolve it, and take 120.7g (NH 4 ) 2 CO 3 Make 5 mol / L aqueous solution, add to calcium hydroxide solution and mix well. Then take 60gCo(NO 3 ) 2 ·6H 2 O, 20g Ni(NO 3 ) 2 ·6H 2 O, 10gCu(NO 3 ) 2 ·6H 2 O, 10gFe(NO 3 ) 2 9H 2 O, 10g (NH 4 ) 6 Mo 7 o 24 4H 2 O, 10g Mn(NO 3 ) 2 4H 2 O, 10g Zn(NO 3 ) 2 · 6H 2 O, 10g Cr(NO 3 ) 3 9H 2 O Add a certain amount of water and stir to dissolve completely. Add the mixed metal salt solution dropwise to the above mixed solution, the solution turns from white suspension to dark green, adjust the pH value of the mixed solution to 14 with ammonia...

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PUM

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Abstract

The invention discloses a preparation method used for a cyanobenzene direct atmospheric hydrogenation catalyst. The preparation method is characterized in that a cyanobenzene hydrogenation reduction catalyst is prepared from 10-55 parts by weight of Co, 5-50 parts by weight of Ni and 5-30 parts by weight of metal element M, wherein the metal element M is one or a mixture of multiple of Cu, Mn, Cr,Zn, Fe, Mo or Mg in any proportion. The catalyst is prepared through a simple co-precipitation method. The catalyst has the advantages of being simple in preparation method, low in cost, high in catalytic activity, good in stability, relatively long in service life, and high in cyanobenzene hydrogenation conversion rate.

Description

technical field [0001] The invention relates to a method for preparing a catalyst, specifically, the invention relates to a method for preparing a catalyst for direct atmospheric pressure hydrogenation of benzonitrile. Background technique [0002] Benzylamine is an important aromatic primary amine, an important organic chemical raw material and fine chemical intermediate. With the continuous development of my country's chemical industry, the market demand for benzylamine is gradually increasing. At present, the annual output of domestically produced benzylamine is low, mainly relying on imports. The production of benzylamine is mainly concentrated in Germany, the United States, and Japan. and other countries. [0003] The catalyst for the selective catalytic hydrogenation of benzonitrile to prepare benzylamine has received extensive attention in recent years. At present, the research on this reaction at home and abroad is mainly in the tank reactor. The literature and pate...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C209/48C07C211/27B01J37/03B01J23/889
CPCB01J23/8898B01J37/031C07C209/48C07C211/27
Inventor 马建泰杨广学
Owner LANZHOU UNIVERSITY
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