Nitrobenzene hydrogenation aniline preparation catalyst for fluidized bed

A catalyst, nitrobenzene technology, applied in the direction of physical/chemical process catalyst, metal/metal oxide/metal hydroxide catalyst, amino compound preparation, etc., can solve the problem of catalyst composition and temperature, different adsorption properties, unfavorable mass production and other problems, to achieve the effect of reducing catalyst unit consumption, single composition, and stable production control

Inactive Publication Date: 2012-10-24
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, due to the large number of components and different adsorption properties of various components, the composition of the prepared catalyst is not suitable for mass production.

Method used

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  • Nitrobenzene hydrogenation aniline preparation catalyst for fluidized bed

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Experimental program
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Effect test

Embodiment 1

[0022] Catalyst preparation is carried out in a closed reactor, and it is implemented in the following steps. ① Preparation of cuproammonia solution: Take 100ml of 10M ammonia water and add it to 500ml of 0.5M copper nitrate solution to prepare a clear cuproammonia complex solution, then add 600 ml of ionized water and stir. ②Impregnation: Take 200g of silica gel and add it to the cuproammonia complex solution in ①, keep it under vacuum at 70℃ for 3 hours while stirring, and the impregnation is completed. ③Separation, washing and drying: Separating the impregnated materials into solid and liquid, washing the solid materials until neutral, and then drying them to obtain the finished catalyst. The copper content of the catalyst is 15.5%, and the specific surface area is 380.5m 2 / g, pore volume 0.72ml / g, average pore diameter 3.5nm.

Embodiment 2

[0024] Catalyst preparation is carried out in an airtight reactor, according to the following steps to implement. ① Preparation of copper ammonia solution: Take 200ml of 10M ammonia water and add it to 500ml of 0.5M copper nitrate solution to prepare a clear copper ammonia complex solution. ②Impregnation: Take 200g of silica gel and add it to the copper ammonia complex solution in ①, stir and vacuumize at 90°C for 4 hours, and the impregnation is completed. ③Separation, washing and drying: Separating the impregnated materials into solid and liquid, washing the solid materials until neutral, and then drying them to obtain the finished catalyst. The copper content of the catalyst is 19.5%, and the specific surface area is 445.4m 2 / g, pore volume 0.82ml / g, average pore diameter 3.8nm.

Embodiment 3

[0026] Catalyst preparation is carried out in an airtight reactor, according to the following steps to implement. ① Preparation of copper ammonia solution: Take 100ml of 10M ammonia water and add it to 500ml of 0.5M copper nitrate solution to prepare a clear copper ammonia complex solution. ②Impregnation: Take 200g of silica gel and add it to the cuproammonia complex solution in ①, and keep it in a vacuum at 80°C for 4 hours while stirring, and the impregnation is completed. ③Separation, washing and drying: Separating the impregnated materials into solid and liquid, washing the solid materials until neutral, and then drying them to obtain the finished catalyst. The copper content of the catalyst is 20.6%, and the specific surface area is 463.5m 2 / g, pore volume 0.63ml / g, average pore diameter 3.1nm.

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Abstract

The present invention belongs to the technical field of catalyst preparation, and provides a nitrobenzene hydrogenation aniline preparation catalyst for a fluidized bed. The catalyst provided by the present invention has the following characteristics that: composition is single, the catalyst only contains an active ingredient copper, introduction of a multi-element component to the catalyst is not required, and physicochemical properties of the catalyst are: an average specific surface area of ??350-500 m<2>/g, an average pore size of 2.5-4.0 nm, and an average pore volume of 0.55-0.85 ml/g. In addition, a mass content of the active ingredient copper in the catalyst is 10-25%; a mass percentage of the catalyst with particle size distribution of 125-600 mum is 80-98%, and a mass percentage of the catalyst with particle size distribution less than 125 mum is less than 2%; and the catalyst has characteristics of high activity, uneasy pore clogging, long service life, high selectivity, and the like.

Description

technical field [0001] The invention belongs to the technical field of catalysts, in particular to a catalyst for producing aniline by hydrogenation of nitrobenzene in a fluidized bed. Background technique [0002] As we all know, the catalyst systems used for gas-phase hydrogenation of nitrobenzene include copper-based, nickel-based and noble metal-based systems. Catalyst supports include silica gel, zeolite, activated alumina and diatoms. Copper catalysts have high activity and selectivity; nickel catalysts are often made into multi-element composite catalysts to maintain high selectivity and activity of the reaction and avoid hydrogenation of benzene rings. In specific production, fixed bed or fluidized bed reactors are usually used. [0003] For fluidized bed catalysts for hydrogenation of nitrobenzene to aniline, it is usually prepared by impregnating the salt containing the active component on the carrier, wherein the active component is usually copper or some other ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/72B01J35/10C07C211/46C07C209/36
Inventor 孙中华殷玉圣袁浩然吴结华吕锋祝东红刘玉娟张皓
Owner CHINA PETROLEUM & CHEM CORP
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