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 reduced selectivity of target products, to avoid further oxidation, good selectivity, avoid The effect of selectivity reduction

Inactive Publication Date: 2009-06-24
BEIJING UNIV OF CHEM TECH
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  • Description
  • Claims
  • Application Information

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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
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  • Production of anone by cyclohexane liquid-phase oxidation

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] The process flow chart is attached figure 1 , in a reactor 1 with a volume of 30 liters, add 20 liters of cyclohexane, pressurize the whole system to 0.9 MPa with nitrogen, raise the temperature of the reactor to 155°C, and inject Air is introduced to carry out the oxidation reaction, and after the oxidation tail gas passes through the condenser 5 and the gas-liquid separator 6, it is evacuated under the pressure of 0.9 MPa. After reacting for 50 minutes, the mixed solution in the reactor 1 was passed into the high-gravity rotating packed bed 3 with the metering pump 2, and air was passed into the packed bed at the same time, the gas-liquid ratio was 70 (volume under standard conditions): 1, 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 oxidized tail gas passes through the...

Embodiment 2-6

[0030] The basic steps are the same as in Example 1, the supergravity level of the supergravity reactor is between 15-670g, the air and the mixed solution are in parallel flow contact, and the gas-liquid ratio of the air and the mixed solution is 70 (volume under standard conditions): 1, The result is as follows:

[0031]

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 liquor is controlled at 35-100 by adjusting the air flow rate entering the supergravity reactor. (Volume under standard conditions): Varies between 1. The result is as follows:

[0034]

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Abstract

The invention relates to a process method for preparing cyclohexanone by liquid-phase oxidation of cyclohexane. The mixed oxidation liquid containing cyclohexanone, cyclohexanol and cyclohexyl hydroperoxide and the oxygen-containing gas after the oxidation induction reaction stage are respectively introduced into the In the high-gravity reactor, under the oxidation condition of cyclohexane, the continuous oxidation of cyclohexane and the decomposition of cyclohexyl hydroperoxide are carried out in the high-gravity environment. The oxidation reaction process of hexanone solves the problem of reduced selectivity of the target product caused by back-mixing in the continuous production process of the traditional process, and avoids a large amount of waste lye produced by the alkali decomposition reaction of peroxide in the presence of a catalyst, thereby providing a A green and environment-friendly process method for preparing cyclohexanone by oxidation of cyclohexane with good selectivity and high efficiency.

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 Patents(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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