Method for preparing cyclohexanone serving as raw material of caprolactam from cyclohexene-hydration cyclohexanol

Abstract

The invention relates to a method for preparing cyclohexanone serving as a raw material of caprolactam from cyclohexene-hydration cyclohexanol. The method comprises the following steps of: (A) removing light components from the cyclohexene-hydration cyclohexanol in a cyclohexanol light component removal tower; (B) heating to vaporize the cyclohexene-hydration cyclohexanol so as to separate and remove heavy components; (C) carrying out dehydrogenation reaction on the cyclohexene-hydration cyclohexanol so as to convert the cyclohexene-hydration cyclohexanol into the cyclohexanone; (D) removing light components by a light component removal tower; (E) removing cyclohexanol and heavy components by a cyclohexanone tower; (F) grading cyclohexanone by a cyclohexanone grading tower; (G) removing heavy components by a cyclohexanol tower; (H) heating to vaporize the recovered cyclohexanol so as to separate and remove heavy components; (I) carrying out dehydrogenation reaction on the recovered cyclohexanol so as to convert the recovered cyclohexanol into the cyclohexanone; and (J) carrying out compressing and purifying treatment on byproduct hydrogen gas of the cyclohexanol dehydrogenation reaction. The method further comprises a process for mixing the cyclohexanone with qualified oxidation-method or phenol-method cyclohexanone. The method has the advantages that the energy consumption and the loop loss of the cyclohexanol are reduced, light-component impurities are removed effectively, and the content of harmful impurities in cyclohexene-hydration cyclohexanone is reduced to meet the requirements for the production of high-quality caprolactam.

Description

technical field [0001] The invention relates to a method for preparing caprolactam raw material cyclohexanone by hydrating cyclohexene method cyclohexanol. More specifically, it relates to a method for preparing cyclohexanone by hydrating cyclohexene method cyclohexanol and using hydrating cyclohexene method cyclohexanone as a raw material for producing caprolactam. technical background [0002] Cyclohexanone is an important organic chemical raw material, mainly used in the production of adipic acid and caprolactam, both of which are intermediates in the production of nylon. In industrial production, cyclohexanone produced by cyclohexane oxidation method or cyclohexanone obtained by hydrogenation and dehydrogenation of phenol is often used to produce caprolactam. In recent years, the production of cyclohexanone by cyclohexene hydration method has been successfully industrialized. The main process of this method is the partial hydrogenation of benzene to cyclohexene, the hyd...

AI Technical Summary

Problems solved by technology

At present, the hydration cyclohexene method cyclohexanone can produce the first-class product caprolactam, but it is still difficult to produce the superior product caprolactam. The reason is that the content of harmful impurities in the current hydration cyclohexene method cyclohexanone is still too high. There are still defects in the process of producing cyclohexanone from cyclohexanol, and the hydration cyclohexene method cyclohexanone produced by the current process method is used as the raw material of caprolactam.

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