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Catalyst for synthesizing aniline through nitrobenzene liquid phase hydrogenation and preparation method thereof

A technology of nitrobenzene liquid and catalyst, which is applied to the preparation of amino compounds, catalyst carriers, chemical instruments and methods, etc. It can solve the problems of catalysts such as poor resistance to high-temperature tar poisoning, difficulty in industrial production, and insufficient spreading performance. Industrialization promotion, step simplification, good economical effect

Pending Publication Date: 2020-12-22
XIAN CATALYST NEW MATERIALS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Generally, activated carbon-supported catalysts have insufficient spreading performance in slurry bed reactors, and there are many by-products such as tar and azobenzene.

Method used

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  • Catalyst for synthesizing aniline through nitrobenzene liquid phase hydrogenation and preparation method thereof
  • Catalyst for synthesizing aniline through nitrobenzene liquid phase hydrogenation and preparation method thereof
  • Catalyst for synthesizing aniline through nitrobenzene liquid phase hydrogenation and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0029] This embodiment provides a catalyst for the synthesis of aniline by liquid-phase hydrogenation of nitrobenzene. The catalyst raw material includes carbon nanotubes after surface modification and precursor atomized particles containing active components and additives. The mass of the active components is 3% of the mass of the catalyst, the quality of the catalyst is 1.5% of the mass of the catalyst, the active component is Pt, the promoters are Ru and Cr, and the quality of Ru is 1.0% of the mass of the catalyst , the quality of Cr is 0.5% of the catalyst quality;

[0030] This example provides a method for preparing the catalyst for the synthesis of aniline by liquid-phase hydrogenation of nitrobenzene using carbon nanotubes after surface modification and precursor atomized particles containing active components and additives as raw materials, specifically :

[0031] Step 1, 50g of the average particle size is 12μm, the specific surface area is 1000cm 2 / g, carbon nan...

Embodiment 2

[0038] This embodiment provides a catalyst for the synthesis of aniline by liquid-phase hydrogenation of nitrobenzene. The catalyst raw material includes carbon nanotubes after surface modification and precursor atomized particles containing active components and additives. The mass of the active components is 3% of the mass of the catalyst, the quality of the catalyst is 1% of the mass of the catalyst, the active component is Pt, the promoters are Ni and W, and the quality of Ni is 0.5% of the mass of the catalyst , the quality of W is 0.5% of the catalyst mass;

[0039] This example provides a method for preparing the catalyst for the synthesis of aniline by liquid-phase hydrogenation of nitrobenzene using carbon nanotubes after surface modification and precursor atomized particles containing active components and additives as raw materials, specifically :

[0040] Step 1. Take 50g of 2 / g, carbon nanotubes with an average pore diameter of 8nm, 15mL of ferric chloride solu...

Embodiment 3

[0047] This embodiment provides a catalyst for the synthesis of aniline by liquid-phase hydrogenation of nitrobenzene. The catalyst raw material includes carbon nanotubes after surface modification and precursor atomized particles containing active components and additives. The mass of the active components is 3% of the mass of the catalyst, the quality of the catalyst is 0.6% of the mass of the catalyst, the active component is Pt, the promoters are Ru and La, and the quality of Ru is 0.5% of the mass of the catalyst , the quality of La is 0.1% of the catalyst mass;

[0048] This example provides a method for preparing the catalyst for the synthesis of aniline by liquid-phase hydrogenation of nitrobenzene using carbon nanotubes after surface modification and precursor atomized particles containing active components and additives as raw materials, specifically :

[0049] Step 1, 50g of the average particle size is 14μm, the specific surface area is 1400cm 2 / g, carbon nanotu...

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Abstract

The invention discloses a catalyst for synthesizing aniline through nitrobenzene liquid phase hydrogenation. The catalyst raw material comprises surface-modified carbon nanotubes and precursor atomized particles containing an active component and auxiliary agents, the active component is Pt, the auxiliary agents are more than two of Ru, Ni, Cr, La and W, and the mass of each assistant is 0.05-1.0%of the mass of the catalyst. In addition, the invention also provides a method for preparing the catalyst. Raw materials of the catalyst comprise surface-modified carbon nanotubes and precursor atomized particles containing the active component and the auxiliary agents, the active component is Pt, and the auxiliary agents are more than two of Ru, Ni, Cr, La and W. The catalyst is applied to catalytic nitrobenzene liquid phase hydrogenation aniline synthesis reaction, and has the advantages of high initial activity, long service life, few tar byproducts, and easy industrial popularization.

Description

technical field [0001] The invention belongs to the technical field of industrial catalysts, and in particular relates to a catalyst for synthesizing aniline by liquid-phase hydrogenation of nitrobenzene and a preparation method thereof. Background technique [0002] Aniline, also known as aminobenzene and anilin oil, is one of the most important amine substances. It is mainly used in the manufacture of polyurethane raw material MDI in chemical production. It is also used in many industries such as pigments, dyes, medicine, pesticides and rubber. There are more than 300 kinds of chemical products and intermediates produced. At present, the aniline production process is mainly based on the catalytic hydrogenation of nitrobenzene, which is divided into fixed-bed gas-phase catalytic hydrogenation, fluidized-bed gas-phase catalytic hydrogenation and slurry-state liquid-phase catalytic hydrogenation. Gas-phase hydrogenation reaction usually requires high reaction temperature and...

Claims

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Application Information

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IPC IPC(8): B01J21/18B01J23/42B01J23/89B01J23/63B01J23/652B01J23/847B01J32/00C07C209/36C07C211/46
CPCB01J21/185B01J23/42B01J23/8993B01J23/63B01J23/6522B01J23/8472C07C209/36B01J35/394B01J35/397B01J35/33C07C211/46Y02P20/584
Inventor 张鹏李岳锋闫江梅唐良刘春红万克柔
Owner XIAN CATALYST NEW MATERIALS CO LTD
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