Method for preparing o-chloroaniline

A technology for o-chloroaniline and o-chloronitrobenzene is applied in the field of liquid-phase catalytic hydrogenation of o-chloronitrobenzene to produce o-chloroaniline, and can solve the problems of lowering product quality, increasing production cost, serious dechlorination, etc. Low, dehydrogenation inhibition, high yield effect

Inactive Publication Date: 2005-08-31
ZHEJIANG UNIV OF TECH
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  • Summary
  • Abstract
  • Description
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  • Application Information

AI Technical Summary

Benefits of technology

This patented process allows for efficient production of an intermediate product called o-Chlorobenzoximidazole (OCA) that has various benefits such as improved efficiency or lower costs compared to traditional methods like nitrone oxide reduction reaction(NRR).

Problems solved by technology

This patented technical solution described involves improving the efficiency or effectiveness of producing opium oxynate (OXON). However, current techniques involve expensive processes such as hydrocracking, acidic nitrification, solvent extraction, and other steps like addition of antimony compounds. These solutions also increase manufacturing costs while limiting their practicality outside industrial settings where large quantities of these materials may exist.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0012] In a 100ml stainless steel high-pressure reactor, add 2g of o-chloronitrobenzene, 0.45g of Ru / C catalyst, 30ml of ethanol solution with a mass percentage of 95%, close the reactor, replace the air with nitrogen for 3 times, start stirring, and heat up to 210 ℃, reacted for 6 hours, stopped the reaction, took out the reaction solution, filtered out the catalyst, and the filtrate was analyzed by gas chromatography for the content of each component. The results showed that the conversion rate of o-chloronitrobenzene was 91.6%, and the selectivity of o-chloroaniline was 88.7%. %.

Embodiment 2

[0014] In a 100ml stainless steel high-pressure reactor, add 2g o-chloronitrobenzene, 0.45g Ru / C catalyst, 30ml mass percentage is 95% ethanol solution, close the reactor, replace the air with nitrogen for 3 times, start stirring, and heat up to 180°C , reacted for 6 hours, stopped the reaction, took out the reaction solution, filtered out the catalyst, and the filtrate was analyzed by gas chromatography for the content of each component. The results showed that the conversion rate of o-chloronitrobenzene was 26.2%, and the selectivity of o-chloroaniline was 97.4%. .

Embodiment 3

[0016] In a 100ml stainless steel high-pressure reactor, add 2g o-chloronitrobenzene, 0.45g NiB amorphous catalyst, 30ml mass percent as 95% ethanol solution, close the reactor, replace the air with nitrogen for 3 times, start stirring, and heat up to 210 DEG C, reacted for 6 hours, stopped the reaction, took out the reaction solution, filtered out the catalyst, and the filtrate was analyzed by gas chromatography for the content of each component. The results showed that the conversion rate of o-chloronitrobenzene was 22.1%, and the selectivity of o-chloroaniline was 89.7%.

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Abstract

A process for preparing O-chlorophenylamine from O-chloronitrobenzene features that under existance of alcohol and the catalyst chosen from Ru/C, non-crystalline NiB, Ni-Fe-B and Ni-Co-B, the O-chloronitrobenzene takes part in catalytic hydrogenation reaction at 150-250 deg.C and then is post-treated to obtain said product. It has high output rate.

Description

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Claims

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Application Information

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Owner ZHEJIANG UNIV OF TECH
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