Production of anone by cyclohexane liquid-phase oxidation

A process method, liquid-phase oxidation technology, applied in the direction of chemical instruments and methods, carbon-based compound preparation, organic compound preparation, etc., can solve the problem of target product selectivity reduction, to avoid further oxidation, strengthen oxidation reaction, efficiency high effect

Inactive Publication Date: 2007-06-20
BEIJING UNIV OF CHEM TECH
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  • Abstract
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Problems solved by technology

[0006] The present invention applies the high gravity technology to the oxidation reaction process of cyclohexane oxidation to prepare cyclohexanone for the first time, which solves the problem of lower selectivity of the target product caused by back-mixing in the continuous production process of the traditional oxidation process; A large amount of waste lye produced by the alkali decomposition reaction in the presence of a catalyst, thus providing a green and environmentally friendly process for the preparation of cyclohexanone by oxidation of cyclohexane with good selectivity and high efficiency

Method used

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  • Production of anone by cyclohexane liquid-phase oxidation
  • Production of anone by cyclohexane liquid-phase oxidation

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Experimental program
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Effect test

Embodiment 1

[0027] The process flow chart is shown in accompanying drawing 1, in the reactor 1 that volume is 30 liters, add 20 liters of cyclohexane, pressurize the whole system to 0.9MPa with nitrogen, the temperature of reactor rises to 155 ℃, with 20L / min Air is passed into the reactor 1 at a rate of 1 to carry out the oxidation reaction. After the oxidation tail gas passes through the condenser 5 and the gas-liquid separator 6, it is evacuated under a pressure of 0.9 MPa. After reacting for 50 minutes, the mixed solution in the reactor 1 was passed into the high-gravity rotary packed bed 3 with the metering pump 2, and air was passed into the packed bed simultaneously, the gas-liquid ratio was 70 (volume under standard conditions): 1, and the air It is in parallel contact with the mixed liquid, and the rotor speed of the rotating packed bed is adjusted so that its supergravity level is 60g. After the reaction is completed, the oxidized liquid flows into the product tank 4, and the oxi...

Embodiment 2-6

[0030] Basic step is identical with embodiment 1, and the supergravity level of supergravity reactor is between 15-670g, and air contacts with mixed solution parallel flow, and the gas-liquid ratio of air and mixed solution is 70 (volume under standard condition): 1, The result is as follows:

[0031] Example

Embodiment 7-9

[0033] The basic steps are the same as in Example 1. The supergravity level of the supergravity reactor is 135g, the air and the oxidizing liquid are in parallel contact, and the gas-liquid ratio of the air and the mixed solution is controlled at 35-100 by adjusting the air flow rate entering the supergravity reactor. (Volume under standard conditions): Change between 1. The result is as follows:

[0034] Example

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Abstract

Production of cyclohexanone by cyclohexane liquid-phase oxidation is carried out by oxidation inductive reacting, inducing oxy-gas and mixed oxide liquid with cyclohexanone, cyclohexanol and cyclohexyl-hydrogen peroxide into super-gravity reactor, continuous oxidation reacting for cyclohexanone and decomposing for cyclohexyl-hydrogen peroxide under cyclohyexanone oxidation. It's efficient, has better selectivity and no environmental pollution.

Description

technical field [0001] The invention relates to a liquid-phase oxidation process, in particular to a process for preparing cyclohexanone and cyclohexanol by liquid-phase oxidation of cyclohexane, and also relates to the application of high gravity technology in chemical reaction engineering. Background technique [0002] Cyclohexanone is the main intermediate for the preparation of caprolactam and hexanediol, and is also an important organic chemical raw material and industrial solvent. The production process of cyclohexanone mainly includes: (1) phenol hydrogenation method, (2) cyclohexane liquid phase oxidation method, (3) cyclohexene hydration method. At present, more than 90% of the cyclohexanone production process adopts the cyclohexane oxidation method. First, cyclohexane is oxidized with air under high temperature and high pressure to produce peroxide, and then the peroxide is decomposed in the alkali aqueous solution containing catalyst to produce cyclohexane. For k...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C45/33C07C49/303
Inventor 陈建峰辛虎邹海魁初广文
Owner BEIJING UNIV OF CHEM TECH
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