Production process of catalytically hydrogenating nitrobenzene halide to synthesize haloarylamine

A technology for halogenated nitrobenzene and catalytic hydrogenation, which is applied in the production field of halogenated nitrobenzene catalytic hydrogenation to synthesize halogenated aniline, can solve the problems of reducing product quality, increasing production cost, low catalytic activity, etc. High activity, good selectivity, and the effect of inhibiting hydrodehalogenation

Inactive Publication Date: 2005-05-04
ZHEJIANG UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The hydrogenation catalyst is affected by Al, its catalytic activity is smaller than that of Renay-Ni, and the hydrogenation catalytic activity decreases rapidly during the reaction process, so the catalyst usage per unit product is high, increasing production costs, and dehalogenation is relatively More serious, reduce product quality

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0007] Catalytic hydrogenation of o-chloronitrobenzene. In a 500ml stainless steel high-pressure reactor, add 56g of o-chloronitrobenzene, 0.45g of carbon nanotube supported Pd catalyst, and 150ml of absolute ethanol, close the reactor, replace the air with nitrogen 3 times, 0.2Mpa each time, and then replace with hydrogen Nitrogen three times, 0.2Mpa each time. Add hydrogen to 1.0Mpa, then raise the temperature to 80°C, start stirring, the hydrogen in the reactor drops to 0.5Mpa, then add hydrogen to 1.0Mpa, react for 90min, and stop the reaction within the next 15min without absorbing hydrogen, open Reactor, take out the reaction solution, filter out the catalyst, and analyze the content of each component of the filtrate by gas chromatography, the results show that the yield of o-chloroaniline is 99.2%, and the dechlorination rate is 0.02%.

Embodiment 2

[0009] The raw material for catalytic hydrogenation is p-chloronitrobenzene, the hydrogenation catalyst and the hydrogenation reaction conditions are the same as in Example 1, the yield of p-chloroaniline is 99.0%, and the dechlorination rate is 0.10%.

Embodiment 3

[0011] The raw material for catalytic hydrogenation is 3,4-dichloronitrobenzene, and the hydrogenation catalyst and hydrogenation reaction conditions are the same as in Example 1. The yield of 3,4-dichloroaniline is 99.2%, and the dechlorination rate is 0.1%.

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PUM

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Abstract

The invention provides a production method for synthesizing halogenated aniline by catalytic hydrogenation of halogenated nitrobenzene. The production method uses carbon nanotubes to support Pd, Pt is a hydrogenation catalyst, p-halogenated nitrobenzene such as o-chloronitrobenzene, p-chloronitrobenzene, 3,4-dichloronitrobenzene, 3-chloro-4 The corresponding halogenated anilines were synthesized by liquid-phase catalytic hydrogenation reaction of -fluoronitrobenzene, etc. The production method can effectively suppress hydrodehalogenation, and has the advantages of good selectivity, high yield, high catalyst stability, etc., and the method has great implementation value and social and economic benefits.

Description

technical field [0001] The invention relates to a production method for synthesizing haloaniline by catalytic hydrogenation of halonitrobenzene, which is characterized in that carbon nanotubes are used to support Pd, and Pt is used as a hydrogenation catalyst to carry out liquid-phase catalytic hydrogenation reaction of halonitrobenzene to synthesize halide Substituted aniline, the production method can effectively inhibit hydrodehalogenation, and the production method has the advantages of good selectivity, high yield and good catalyst stability. Halogenated anilines are important intermediates of medicines, pesticides, dyes and daily chemicals, and the synthesis of haloanilines by catalytic hydrogenation has important social and economic benefits. technical background [0002] Halogenated anilines are important chemical intermediates for medicine, pesticides, dyes, spices, etc., and have a wide range of uses. The synthesis methods of halogenated aniline usually include ir...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07C209/36C07C211/52C07C309/36
Inventor 严新焕徐振元应永飞
Owner ZHEJIANG UNIV OF TECH
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