Improved process for producing cyclohexanol and pimelinketone

A technology of cyclohexanol and cyclohexanone, which can be used in the preparation of oxygen-containing compounds by hydrocarbon oxidation, organic chemistry and other directions, and can solve the problems of low yield and the like

Inactive Publication Date: 2008-05-07
肖藻生
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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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

Method used

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  • Improved process for producing cyclohexanol and pimelinketone
  • Improved process for producing cyclohexanol and pimelinketone

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Embodiment

[0010] Embodiment: This embodiment uses the schematic diagram of the pseudo-homogeneous decomposition process flow diagram of cyclohexyl hydroperoxide shown in FIG. 2 . The cyclohexane oxidation liquid of 379 tons / hour passes through heat exchanger from oxidation process, cooler, and temperature drops to 60 ℃, contains cyclohexyl hydroperoxide 3.4% (Wt%), cyclohexanone in this cyclohexane oxidation liquid 0.35%, cyclohexanol 0.7%, organic carboxylic acid 0.2%, other components 0.2%, cyclohexane is 95.15%, this cyclohexane oxidation liquid and the 500m that comes from lye circulation pump 4 3 / hour circulating alkali and 40m from the alkali separator 9 and the washing water separator 10 3 / h Alkali aqueous solution is mixed in a static mixer, and 40 liters of aqueous solution containing 300 ppm of cobalt acetate is added at the same time; the cyclohexane phase is a dispersed phase, and the alkali solution is an emulsion of a continuous phase, and then enters the first step dec...

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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...

Claims

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Application Information

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IPC IPC(8): C07C27/12C07C35/08C07C49/403
Inventor 肖藻生翁平武
Owner 肖藻生
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