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Production process of catalytically hydrogenating nitrobenzene halide to synthesize haloarylamine

A technology of catalytic hydrogenation of halogenated nitrobenzenes, which is applied in the field of production of halogenated arylamines by catalytic hydrogenation of halogenated nitrobenzenes, can solve problems such as lowering product quality, increasing production costs, and low catalytic activity, and achieves The catalyst has high activity, good selectivity, and the effect of inhibiting hydrodehalogenation

Inactive Publication Date: 2004-06-23
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 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 production process is liquid phase catalytic hydrogenation reaction of nitrobenzene halide, such as o-chloronitrobenzene, p-chloronitrobenzene, 3, 4-dichloronitrobenzene and 3-chloro-4-fluoronitrobenzene, etc. with carbon nanotube carried Pd and Pt as hydrogenation catalyst to produce corresponding haloarylamine. The said production process can inhibit hydrodehalogenation, and has the advantages of high selectivity, high yield and high catalyst stability, etc. and thus high practical value.

Description

technical field [0001] The invention relates to a production method for synthesizing halogenated arylamines by catalytic hydrogenation of halogenated nitrobenzenes, 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 synthesis of halogenated nitrobenzenes The halogenated arylamine can effectively suppress hydrodehalogenation by adopting the production method, and the production method has the advantages of good selectivity, high yield, good catalyst stability and the like. Halogenated arylamines are important intermediates of medicines, pesticides, dyes and daily chemicals, and the synthesis of halogenated arylamines by catalytic hydrogenation has important social and economic benefits. technical background [0002] Halogenated aromatic amines are important chemical intermediates for medicine, pesticides, dyes, spices, etc., and have a wide range of uses....

Claims

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Application Information

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Patent Type & Authority Applications(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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