Improved process for producing cyclohexanol and pimelinketone

Abstract

The invention discloses an improved method for preparing cyclohexanol and cyclohexanone. The invention is characterized in that the decomposition reaction of cyclohexyl peroxide is accomplished with two steps; during the first decomposition reaction, the flow of circulated alkaline is equal to or larger than that of cyclohexane oxydic liquid, thereby ensuring the alkaline water phase to become a continuous phase of the material in the first decomposition reaction; the cyclohexane phase is dispersed; the decomposition reaction is accomplished under an emulsification state, or is called even phase decomposition; the compound from the decomposition reaction is rough separated through a hydrocyclone separator; a large amount of alkaline liquid is separated from the lower outlet of the hydrocyclone separator to be recycled; the material of cyclohexane from the upper outlet of the hydrocyclone separator is changed to the continuous phase, while little alkaline liquid is changed into the dispersing phase; the waste alkaline liquid is separated by lifting a separation groove through gravity; the second decomposition reaction is then accomplished to ensure a full decomposition reaction. With the technical improvement, the total mol yield of the oxidation of cyclohexane prepared cyclohexanol and the cyclohexanone device is increased by 5 percent.

Description

Technical field: [0001] The invention relates to a method for preparing cyclohexanol and cyclohexanone by oxidizing cyclohexane. Further illustration, the invention relates to an improved method for producing cyclohexanol and cyclohexanone by decomposing cyclohexyl hydroperoxide. Background technique: [0002] ZL88105772.X; ZL94110939.9; ZL98112730.4 patents disclose a process for preparing cyclohexanol and cyclohexanone by oxidation of cyclohexane. The preparation process includes: (A) at a temperature of 150°C to 190°C and a pressure of 0.8Mpa to 2Mpa, cyclohexane is oxidized with a gas containing molecular oxygen to generate an oxidation mixture containing cyclohexyl hydroperoxide; (B) at a temperature of Under the conditions of 50℃~120℃, pressure 0.01Mpa~1.5Mpa, use a soluble transition metal catalyst for homogeneous catalytic decomposition or use a transition metal catalyst for heterogeneous catalytic decomposition in alkaline aqueous solution, so that the cyclohexyl in...

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to develop a new set of cyclohexyl hydroperoxide decomposition process, namely to solve cyclohexane oxidation preparation cyclohexanol and cyclohexanone in the second development stage of cyclohexyl hydroperoxide homogeneous catalytic decomposition and heterogeneous catalysis Decompose the technical problem that the yields of the two processes are relatively low

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