Method for separating catalyst by using ceramic membrane filter, and apparatus thereof

Abstract

The present invention relates to a method for separating a catalyst by using a ceramic membrane filter, and an apparatus thereof, wherein discharged clear liquid of two membrane assemblies connected in series separately enter corresponding discharged clear liquid collection tubes, and then separately enter reaction product intermediate tanks. According to the present invention, the traditional clear liquid discharging way of the two membrane assemblies connected in series is changed so as to achieve the same transmembrane pressure difference of the two membrane assemblies connected in series, and concurrently achieve the same production load (a mount of the discharged clear liquid) of the two membrane assemblies, such that operation periods of the two membrane assemblies connected in series are the same, a service life of the ceramic membrane tube is substantially improved, and the ceramic membrane tube is only required to be chemically cleaned after operating about 2-3 months so as to prolong an operation period of the device and substantially reduce the number and cost of chemical cleaning.

Description

technical field [0001] The invention belongs to the technical field of chemical industry, and in particular relates to a method and a device for separating a catalyst by a ceramic membrane filter, and is particularly suitable for preparing cyclohexanone oxime by ammoximation reaction of cyclohexanone. Background technique [0002] The new process of preparing cyclohexanone oxime by ammoximation reaction of cyclohexanone is to put cyclohexanone, ammonia and hydrogen peroxide in the same reactor to synthesize cyclohexanone oxime in one step. Compared with other processes, it has the advantages of short process, environmental friendliness, mild reaction conditions and low equipment investment. The process has received attention since the 1960s, but it was only recently that it became economically viable on an industrial scale thanks to improvements in titanium-silicon molecular sieve catalysts and hydrogen peroxide production technology. In recent years, Sinopec and Italy's En...

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Problems solved by technology

The separation process of this connection relationship cannot achieve the same transmembrane pressure difference between the two membrane modules connected in series, and due to the inconsistency of the production load (clear liquid output) of the two membrane modules, the Inconsistency in the operating cycle, resulting in the ceramic membrane tube can only run for about 3 to 5 days, and chemical cleaning is required, which not only consumes energy and cost, but also greatly reduces the service life of the ceramic membrane tube

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