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A kind of nitrobenzene preparation aniline catalyst and its preparation method, the method for preparation 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, achieve the effect of improving service life and avoiding deactivation

Active Publication Date: 2022-02-18
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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  • A kind of nitrobenzene preparation aniline catalyst and its preparation method, the method for preparation aniline
  • A kind of nitrobenzene preparation aniline catalyst and its preparation method, the method for preparation aniline

Examples

Experimental program
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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 producing aniline from nitrobenzene. The catalyst includes a porous carrier, an active component and an auxiliary agent loaded on the carrier, wherein the active component includes Pt, and the auxiliary agent includes MoO 3 and Co; the present invention also provides a method for preparing the catalyst and a method for preparing aniline using the catalyst. The present invention adds MoO on the catalyst carrier 3 and Co, using MoO 3 and Co, especially MoO 3 The synergistic effect between Pt and Pt can change the electronic configuration of Pt and reduce the ability of Pt to adsorb CO, which can effectively avoid the inactivation of Pt due to the adsorption of CO.

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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Patent Type & Authority Patents(China)
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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