A stable and efficient catalytic hydrogenation method for the preparation of aromatic amines

A technology for catalytic hydrogenation and aromatic amines, which is applied in the preparation of amino compounds, cyanide reaction preparation, chemical instruments and methods, etc., can solve the problems such as the decline of hydrogenation catalysts, and achieves reduced content, small metal particle size, and high catalytic activity. Effect

Active Publication Date: 2022-03-18
HEBEI JIANXIN CHEM IND CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Aiming at the problems existing in the prior art, the present invention provides a stable and efficient method for preparing aromatic amines by catalytic hydrogenation. By adding a stabilizer in the preparation process, the problem of performance degradation of hydrogenation catalysts caused by raw material impurities is effectively solved. Improved catalyst stability and product yield

Method used

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  • A stable and efficient catalytic hydrogenation method for the preparation of aromatic amines
  • A stable and efficient catalytic hydrogenation method for the preparation of aromatic amines
  • A stable and efficient catalytic hydrogenation method for the preparation of aromatic amines

Examples

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Effect test

Embodiment 1

[0039] Weigh 10g of activated carbon with a particle size of 1000 mesh and a specific surface area of ​​1800m 2 / g, the pore volume is 0.6mL / g, first configure 6mL containing H 2 PdCl 4 , CuCl 2 and the mixed solution of furfural (the quality that contains Pd in ​​the mixed solution is 0.01g, the quality that contains Cu is 0.01g, and the quality that contains furfural is 0.01g); The mixed solution is added dropwise in the gac, and stirs; Vacuum-dry the impregnated catalyst at 25°C for 10 h; configure 6 mL of the same mixed solution as above, impregnate with equal volume, and dry under the same conditions as above, so that a total of 5 times with equal volume; catalyst in H 2 Reduction was carried out at 60° C. for 6 hours under atmosphere to obtain a 3% Pd-3% Cu / C catalyst.

Embodiment 2

[0041] Weigh 10g of activated carbon with a particle size of 100 mesh and a specific surface area of ​​1000m 2 / g, the pore volume is 0.3mL / g, first configure 3mL containing H 2 PtCl 6 , CuCl2 and the mixed solution of furfural (the quality containing Pt in the mixed solution is 0.02g, the quality containing Cu is 0.01g, and the quality containing furfural is 0.02g); at 25 ℃, the mixed solution is added dropwise in the activated carbon, and Stir evenly; vacuum-dry the impregnated catalyst at 20°C for 20 hours; configure 3mL of the same mixed solution above, impregnate with equal volume, and dry under the same conditions as above, so that a total of equal volume impregnate 10 times; catalyst in H 2 Reduction was carried out at 80° C. for 3 h under atmosphere to obtain a 6% Pt-3% Cu / C catalyst.

Embodiment 3

[0043] Weigh 10g of activated carbon with a particle size of 400 mesh and a specific surface area of ​​1600m 2 / g, the pore volume is 0.8mL / g, first configure 8mL containing Pt(NO 3 ) 2 , Cu(NO 3 ) 2 and the mixed solution of furfural (the quality containing Pt in the mixed solution is 0.01g, the quality containing Cu is 0.01g, and the quality containing furfural is 0.02g); at 20 ℃, the mixed solution is added dropwise in the activated carbon, and Stir evenly; vacuum-dry the impregnated catalyst at 20°C for 7 hours; configure 8ml of the same mixed solution as above, impregnate with equal volume, and dry under the same conditions as above, so that a total of equal volume impregnate 5 times; catalyst in H 2 Reduction was carried out at 70° C. for 5 h under atmosphere to obtain a 4% Pt-4% Cu / C catalyst.

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Abstract

A stable and efficient method for preparing aromatic amines by catalytic hydrogenation. The aromatic amines are prepared by catalytic hydrogenation of aromatic nitro compounds. In the method, a stabilizer is added to the reaction solvent. In the presence of the stabilizer, aromatic nitro compounds and The aromatic amine is obtained by catalytic hydrogenation reaction of hydrogen under the action of a catalyst. In the invention, a stabilizer is added in the preparation process, which effectively solves the problem of performance degradation of the hydrogenation catalyst caused by impurities contained in raw materials, and improves catalyst stability and product yield.

Description

technical field [0001] The invention relates to a method for preparing aromatic amines through stable and efficient catalytic hydrogenation, and belongs to the technical field of catalytic hydrogenation. Background technique [0002] Aromatic amines are an important class of organic chemical intermediates, widely used in medicine, materials, dyes, pesticides and other fields. [0003] The method of preparing aromatic amines by catalytic hydrogenation reduction of nitroaromatic compounds has attracted much attention and has been widely used because of its environmental friendliness and recyclable catalysts. However, when the catalytic hydrogenation reduction method is used to prepare aromatic amines from aromatic nitro compounds, the impurity compounds contained in industrial raw materials often affect the performance of the hydrogenation catalyst, which in turn leads to a decrease in the stability of the catalyst. [0004] Therefore, it is necessary to solve the problem of ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07C209/36C07C211/52C07C211/47C07C213/02C07C215/76C07C217/84C07C227/04C07C229/60B01J23/89
CPCC07C209/36C07C209/365C07C213/02C07C227/04B01J23/8926C07C211/52C07C211/47C07C215/76C07C217/84C07C229/60Y02P20/584
Inventor 朱秀全刘佳伟张群峰李小年
Owner HEBEI JIANXIN CHEM IND CO LTD
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