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Catalyst for nitrobenzene-to-aniline, and preparation method thereof, and method for preparing aniline

A technology for producing aniline and catalysts from nitrobenzene, which is applied in the direction of catalyst activation/preparation, preparation of amino compounds, chemical instruments and methods, etc. It can solve problems such as easy poisoning, and achieve the effects of improving service life, avoiding deactivation, and reducing capacity

Active Publication Date: 2019-06-25
WANHUA CHEM GRP CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The purpose of the present invention is to provide a catalyst for preparing aniline from nitrobenzene in a slurry bed and a preparation method thereof, so as to solve the problem that existing catalysts are easily poisoned due to the presence of CO

Method used

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  • Catalyst for nitrobenzene-to-aniline, and preparation method thereof, and method for preparing aniline
  • Catalyst for nitrobenzene-to-aniline, and preparation method thereof, and method for preparing aniline

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] 24.5gAlCl 3 , 21.4gZn (NO 3 ) 2 Dissolve in 1L of deionized water, then add 28.1g of cetyltrimethylammonium chloride into the above salt solution, raise the temperature of the salt solution to 30°C in a water bath, adjust the pH to 8 by adding ammonia water dropwise, and form a condensation after stirring for 1 hour. The glue precipitated and aged at 90°C for 12h. Then take it out to cool, filter, and wash with a large amount of deionized water to remove the template agent to obtain a white solid powder. After that, put the solid powder in a muffle furnace and roast it, raise it to 500 °C at 1 °C / min, and continue roasting for 6 hours to further remove the template agent, and you can get mesoporous Al 2 o 3 And ZnO composite carrier. Take 0.13gH 2 PtCl 6 ·6H 2 O, 1.95gCoCl 2 ·6H 2 O, 0.64g (NH 4 ) 2 MoO 4 Dissolved in deionized water, the mesoporous Al 2 o 3 and ZnO composite carrier were added to the above salt solution, and then dried under electromagne...

Embodiment 2

[0041] 27.7gAlCl 3 , 16.4gZn (NO 3 ) 2 Dissolve in 1L of deionized water, then add 26.9g of cetyltrimethylammonium chloride to the above salt solution, raise the temperature of the salt solution to 30°C in a water bath, adjust the pH to 8 by adding ammonia water dropwise, and form a gel after stirring for 1 hour. The glue precipitated and aged at 90°C for 12h. Then take it out to cool, filter, and wash with a large amount of deionized water to remove the template agent to obtain a white solid powder. After that, put the solid powder in a muffle furnace and roast it, raise it to 500 °C at 1 °C / min, and continue roasting for 6 hours to further remove the template agent, and you can get mesoporous Al 2 o 3 And ZnO composite carrier. Take 6.1gH 2 PtCl 6 ·6H 2 O, 16.2gCoCl 2 ·6H 2 O, 5.6g (NH 4 ) 2 MoO 4 Dissolved in deionized water, the mesoporous Al 2 o 3 and ZnO composite carrier were added to the above salt solution, and then dried under electromagnetic stirring ...

Embodiment 2-1

[0043] Compared with Example 2, the difference is that the AlCl 3 and Zn(NO 3 ) 2 Zn(NO 3 ) 2 Replaced with AlCl of the same quality 3 , to obtain catalyst 2-1#, after determination, measured by BET method, its specific surface area is 189m 2 / g and the average pore diameter were 15 nm.

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Abstract

The invention discloses a catalyst for nitrobenzene-to-aniline, wherein the catalyst comprises a porous carrier, an active component and an auxiliary agent, wherein the active component and the auxiliary agent are supported on the carrier, the active component comprises Pt, and the auxiliary agent comprises MoO3 and Co. The present invention further provides a preparation method of the catalyst, and method for producing aniline by using the catalyst. According to the present invention, by loading MoO3 and Co on the catalyst carrier, the electronic configuration of Pt is changed by using the synergistic effect between MoO3 and Co, especially between MoO3 and Pt, so as to reduce the adsorbing ability of Pt to CO, such that the Pt deactivation due to adsorption of CO can be effectively avoided.

Description

technical field [0001] The invention belongs to the field of producing aniline by liquid-phase hydrogenation of nitrobenzene, and specifically relates to a slurry-bed catalyst for producing aniline by liquid-phase hydrogenation of nitrobenzene, a preparation method of the catalyst, and a method for producing aniline by liquid-phase hydrogenation of nitrobenzene method. Background technique [0002] Aniline is an important intermediate in the synthesis of many fine chemicals and has a wide range of uses. In recent years, as the raw material of isocyanate, with the improvement of polyurethane production capacity, the demand is increasing day by day, and the prospect of development and utilization is broad. [0003] Catalytic hydrogenation of nitrobenzene is the main method for the industrial production of aniline at present. There are three methods: fixed-bed gas-phase catalytic hydrogenation, fluidized-bed gas-phase catalytic hydrogenation and slurry-bed liquid-phase hydroge...

Claims

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Application Information

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IPC IPC(8): B01J23/89B01J35/10B01J37/02B01J37/16B01J37/08C07C209/36C07C211/46
Inventor 韩冰徐丹王旭永姚雨张宏科华卫琦
Owner WANHUA CHEM GRP CO LTD
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