A kind of recovery process and device of benzene partial hydrogenation catalyst

Abstract

The invention discloses a new process and device for recovering benzene partial hydrogenation catalyst. The process is to sequentially undergo sedimentation separation, degassing, oil-water separation, and catalyst sedimentation of the mixed solution of the catalyst slurry from the hydrogenation reaction unit and the generated oil. Separation, membrane separation and other processes, recover the water and catalyst in the mixed solution, the catalyst is reused in the original production process, part of the water is used as flushing water for the flash tank and its feed, and the tank bottom discharge pipeline, and the other part is reused in the in the original production process. The process and device of the present invention use oil-water separators and special membrane separators for the recovery of hydrogenation catalysts, and improve related equipment and pipeline materials to reduce the loss of catalysts and avoid catalyst poisoning. The 100,000 tons / year scale The cyclohexanol plant saves tens of millions of yuan in annual production costs. In addition, the recycling of flushing water can reduce the discharge of wastewater by more than 98%, and the economic and environmental benefits are remarkable.

Description

technical field [0001] The invention relates to the recovery of a benzene partial hydrogenation catalyst, in particular to a new recovery process and device for a benzene partial hydrogenation catalyst. Background technique [0002] Cyclohexene is an important organic synthesis intermediate and chemical raw material, mainly used in organic synthesis, oil extraction and as a solvent, in medicine, pesticides, dyes, detergents, explosives, feed additives, polyester and other fine The production of chemicals has broad application prospects; in addition, cyclohexanone and adipic acid, the deep-processing products of cyclohexene, are widely used intermediates in the synthesis of polyamide fibers. [0003] So far, the process of preparing cyclohexene by partial hydrogenation of benzene is the best method for industrial large-scale production of cyclohexene. The process flow is: benzene, hydrogen and catalyst slurry are sent to the first hydrogenation reactor and the second hydroge...

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Problems solved by technology

[0005] The purpose of the present invention is to provide a new recovery process and device for benzene partial hydrogenation catalyst to solve the problems of high environmental protection pressure, catalyst loss and high production cost in the existing process, so as to reduce the loss of expensive catalyst and reduce production cost and to prevent fouling and corrosion of equipment caused by catalyst slurry entering subsequent processes, and to avoid secondary environmental pollution caused by catalyst slurry entering wastewater

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