Online discharged material cleaning device and method for deactivated catalysts in cyclohexanone oximation reaction

Abstract

The invention provides an online discharged material cleaning device for deactivated catalysts in a cyclohexanone oximation reaction. The bottom of a catalyst discharging tank is connected with a delivery pump through a delivery pipeline, the top of the catalyst discharging tank is connected with a recirculation cooler through a delivery pipeline, the delivery pipeline of the delivery pump and the delivery pipeline of the recirculation cooler are converged and then connected with the lower portion of a filter, the bottom of the filter is connected with a settling tank through a delivery pipeline, the upper portion of the filter is connected with a cleaning tank through a delivery pipeline, and the bottom of the cleaning tank is connected with a clear liquid delivery pump through a delivery pipeline and then connected to an oximation reaction kettle. A cleaning method includes: returning turbid catalyst liquid discharged from the oximation reaction kettle into the catalyst discharging tank, performing self-circulation cooling through the delivery pump, delivering to the filter to realize cleaning and filtering, and directly pressing catalyst slurry fluid into the settling tank after filtering and cleaning to realize standing, settling and separating. The reaction material containing catalysts discharged from the reaction kettle can be cleaned by means of alcohol washing, water washing and condensing, material recovery is realized, and contents of organics in the discharged catalysts are lower than 500PPM.

Description

technical field [0001] The invention relates to an online discharging and cleaning device for a cyclohexanone oximation reaction catalyst, which belongs to the field of chemical technology and equipment. Background technique [0002] Cyclohexanone oxime is an important intermediate in the production of caprolactam, which is produced by the oximation reaction of hydroxylamine and cyclohexanone. At present, the main production method of cyclohexanone oxime is to use hydrogen peroxide, ammonia and cyclohexanone to react to generate cyclohexanone oxime in the presence of titanium silicon molecular sieve catalyst and tert-butanol solvent. Remove the molecular sieve catalyst to obtain the reaction clear liquid, and then obtain high-purity cyclohexanone oxime through a series of rectification and extraction processes. [0003] Judging from the current operating conditions of domestic ammonia oximation units, due to the deactivation and loss of catalysts due to certain carbon depos...

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Problems solved by technology

The shutdown of the reactor consumes a lot of manpower and material resources, which also affects the efficient and stable long-term operation of the ammoximation process

[0004] Utility models CN201596496U, CN201988375U etc. have reported on the ammoximation reactor for the production of cyclohexanone oxime, but there is no description for the treatment of the catalyst in the production process

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