Method for regenerating catalyst for synthesizing o-chloroaniline

Abstract

The invention discloses a method for regenerating a catalyst for synthesizing o-chloroaniline. The method for regenerating the catalys specifically includes the following steps of: filtering a palladium-carbon catalyst out in a filter which is provided with a metal sintered tube and arranged in a final-stage kettle of four-stage series hydrogenation kettles, introducing the palladium-carbon catalyst into an alkaline washing kettle, conducting alkaline washing on the palladium-carbon catalyst with a hot alkaline solution, introducing the alkaline-washed palladium-carbon catalyst into an ultrasonic cleaner to perform ultrasonic cleaning, introducing the ultrasonic-cleaned palladium-carbon catalyst into a water washing kettle for water washing, putting the water-washed palladium-carbon catalyst into an oven for drying and water removal, and then raising the temperature and calcining the dried palladium-carbon catalyst to obtain the dried and regenerated palladium-carbon catalyst. According to the method for regenerating the catalyst for synthesizing the o-chloroaniline, the useful palladium-carbon catalyst can be effectively recycled, the content of o-phenylenediamine obtained throughthe catalysis of the palladium-carbon catalyst is 98% or above, the synthesis cost is saved, and the economic benefit is improved; besides, the method and the process design of the regeneration of the catalyst used for synthesizing the o-chloroaniline are optimized, and requirements of the industrial design are met.

Description

technical field [0001] The invention relates to the technical field of pesticide synthesis, in particular to a catalyst regeneration method for synthesizing o-chloroaniline. Background technique [0002] Palladium carbon catalyst is a commonly used catalyst for hydrogenation reaction in chemical industry. Palladium-carbon hydrogenation has the characteristics of high hydrogenation reduction, good selectivity, stable performance, and small feed ratio when used. However, during the use of the palladium-carbon catalyst, due to factors such as the micropores of the palladium-carbon catalyst being blocked by organic matter, the active component palladium being covered by organic matter, and the palladium crystal grains growing to reduce the dispersion, the activity of the catalyst is reduced, or even completely Inactivate. [0003] Palladium is a rare precious metal, and palladium-carbon catalysts are very expensive. The deactivated palladium carbon catalyst is properly treate...

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Problems solved by technology

This method requires high temperature and high pressure treatment, which is very inconvenient in actual operation

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