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Method for preparing aniline through nitrobenzene hydrogenation and preparation method for catalyst used in method

A technology for the preparation of nitrobenzene and hydrogen, which is applied in the preparation of organic compounds, molecular sieve catalysts, and amino compounds. It can solve problems such as difficult continuous production, easy corrosion of equipment, and difficult product separation, achieving high selectivity and low price. Inexpensive, small particle size effect

Active Publication Date: 2020-05-01
XIANGTAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] Aniline is widely used in the synthesis of dyes, medicines, pesticides, etc. The traditional production method of aniline is the reduction of nitrobenzene Fe powder, which has great environmental pollution, and the equipment is easy to corrode, continuous production is difficult, the efficiency is low, and product separation is difficult, etc. Characteristics, liquid-phase hydrogenation of nitrobenzene to prepare aniline is an energy-saving and environmentally friendly production route, and is currently the most widely used aniline production method

Method used

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  • Method for preparing aniline through nitrobenzene hydrogenation and preparation method for catalyst used in method
  • Method for preparing aniline through nitrobenzene hydrogenation and preparation method for catalyst used in method
  • Method for preparing aniline through nitrobenzene hydrogenation and preparation method for catalyst used in method

Examples

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Effect test

Embodiment 1

[0023] Catalyst preparation: take 0.146g ZrOCl 2 ·8H 2 O was dissolved in 15mL deionized water and ultrasonicated for 10min to make ZrOCl 2 ·8H 2 O is completely dissolved, add 0.5g SBA-15, heat in a water bath at 80°C and stir for 4h, then use 0.2mol / L NH 4 HCO 3 The pH of the solution was adjusted to 9, continued to stir for 5 hours, and stood still for 12 hours. The resulting solution was washed with deionized water, filtered, dried at 80°C, and calcined at 600°C to obtain a zirconia / SBA-15 composite carrier with a mass fraction of zirconia of 10%. Take 0.5g zirconia / SBA-15 and dissolve in ethylene glycol, then add 0.276g Co(NO 3 ) 2 ·6H 2 O, stirred in a water bath at 30°C for 6h, with 0.2mol / LNH 3 ·H 2 O adjusted the pH to 9, continued to stir for 4 h, washed the resulting solution three times with absolute ethanol and deionized water, dried in vacuum at 80 °C, and reduced with hydrogen at 600 °C for 4 h to obtain a Co-zirconia / zirconia with a mass fraction of 10%...

Embodiment 2

[0026] Same as Example 1, except that the mass fraction of Co in Co-zirconia / SBA-15 is 5%, that is, 5% Co-10% zirconia / SBA-15.

Embodiment 3

[0028] Same as Example 1, the difference is that the mass fraction of Co in Co-zirconia / SBA-15 is 15%, that is, 15% Co-10% zirconia / SBA-15.

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Abstract

The invention provides a method for preparing aniline through nitrobenzene hydrogenation. The method comprises the step of adopting a catalyst loaded with cobalt on a composite carrier for catalytic reaction, wherein the composite carrier is a composite carrier forming a zirconium oxide structure on an SBA-15 molecular sieve; and the catalyst is Co-zirconium oxide / SBA-15. The invention also provides a preparation method for the catalyst. The preparation method comprises the following steps: preparing the composite carrier, then impregnating the composite carrier, and loading cobalt onto the composite carrier in a hydrogen environment by using a high-temperature gas-phase reduction method so as to obtain the catalyst. The catalyst for preparing the aniline through nitrobenzene hydrogenation, which is prepared by adopting a gas phase reduction method, has the advantages of high cobalt nanoparticle dispersity, small particle size, large carrier specific surface area and novel catalyst structure. The catalyst is used for selective hydrogenation of nitrobenzene; reaction conditions are mild; catalytic activity is good; and high selectivity (more than 99%) and conversion rate (more than99%) can be simultaneously achieved in the reaction of preparing the aniline through nitrobenzene hydrogenation.

Description

technical field [0001] The invention relates to the field of hydrogenation method and catalyst preparation thereof, in particular to a method for preparing aniline by selective catalytic hydrogenation of nitrobenzene and a preparation method of the catalyst thereof. Background technique [0002] Aniline is widely used in the synthesis of dyes, medicines, pesticides, etc. The traditional production method of aniline is the reduction of nitrobenzene Fe powder, which has great environmental pollution, and the equipment is easy to corrode, continuous production is difficult, the efficiency is low, and product separation is difficult, etc. Characteristic, liquid-phase hydrogenation of nitrobenzene to prepare aniline is an energy-saving and environment-friendly production route, and it is also the most widely used aniline production method at present. It has been reported that the most commonly used catalysts in the reaction mainly rely on supported noble metals, such as Pd, Pt, R...

Claims

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Application Information

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IPC IPC(8): B01J29/03C07C209/36C07C211/46
CPCB01J29/0333C07C209/36B01J2229/186C07C211/46Y02P20/584
Inventor 周继承罗文星
Owner XIANGTAN UNIV
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