Liquid-phase oxidation method for cyclohexane

A cyclohexane, said technology, applied in the direction of chemical instruments and methods, hydrocarbon oxidation to oxygenate, organic chemistry, etc., can solve the problem of cyclohexane circulation, high energy consumption, cyclohexanone and cyclohexanol Low yield and other problems, to achieve the effect of increased reaction rate and heat transfer rate, strong heat transfer efficiency, and safety assurance

Active Publication Date: 2008-10-29
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0012] In short, due to the current production process, there are large cyclohexane circulation, high energy consumption, low yie

Method used

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  • Liquid-phase oxidation method for cyclohexane
  • Liquid-phase oxidation method for cyclohexane
  • Liquid-phase oxidation method for cyclohexane

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0060] The form of microchannel reactor is adopted, and the structure of liquid inlet and microchannel is shown in figure 1 , the reaction microchannel size is the same as the inlet size.

[0061] For the reaction process, see image 3 . The microchannel reactor plate is 5cm wide, 6cm long, and 2mm thick; the channels are divided into four groups, each group has five channels, the channel length is 50mm, and the spacing is 0.5mm; the spacing between each group is 2mm, and there are 1 micropore of 200μm×200μm; the corresponding short channel is designed on the back of the reaction disk, the gas-liquid T-shaped mixing, the gas inlet channel is a square channel with a size of 300μm×300μm, the gas inlet and the liquid inlet are vertical; the liquid inlet size is 300 μm × 300 μm square channel.

[0062] Carry out cyclohexane oxidation reaction with pure oxygen as oxidant, the initiator in cyclohexane solution is the mixture of cyclohexanone and cyclohexanol mass ratio is 1:1, ac...

Embodiment 2

[0064] For the reaction process, see image 3 . The reactor is a microcoil reactor with an inner diameter of 0.53mm and a length of 50m. Carry out cyclohexane oxidation reaction with air as oxidant, the initiator in cyclohexane solution is the mixture of cyclohexanone and cyclohexanol mass ratio is 1:1, accounts for 0.5% of cyclohexane weight, reaction temperature 170 ℃, pressure 1.3MPa, residence time 5min, gas / liquid molar ratio 1.0:1. The conversion rate of cyclohexane is 2.5%, and the total selectivity of cyclohexanone, cyclohexanol and cyclohexyl hydroperoxide is 98%.

Embodiment 3

[0066] For the reaction process, see image 3 . The reactor is a microcoil reactor with an inner diameter of 1.3 mm and a length of 12 m. Carry out cyclohexane oxidation reaction with air as oxidant, initiator in cyclohexane solution is the mixture of cyclohexanone and cyclohexanol mass ratio is 1: 1, accounts for 0.8% of cyclohexane weight, reaction temperature 165 ℃, pressure 1.25MPa, residence time 5min, gas / liquid molar ratio 1.1:1. The conversion rate of cyclohexane is 3.5%, and the total selectivity of cyclohexanone, cyclohexanol and cyclohexyl hydroperoxide is 86%.

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Abstract

A liquid-phase oxidation method of cyclohexane is provided. The oxidation method is characterized in that the method comprises carrying out reaction of molecular oxygen-containing gas and cyclohexane at a mole ratio of (0.1-10):1 in a micro-reactor under 0.8-2.5MPa at 145-200 DEG C for 0.5-30min. The micro-reactor is a micro-channel reactor or a micro-tube reactor. The method ensures safety and enhances heat transfer, and can remarkably improve the oxidizing reaction speed of cyclohexane and the total selectivity of cyclohexanone, cyclohexanol and cyclohexyl hydrogen peroxide.

Description

technical field [0001] The invention relates to a liquid-phase oxidation method of cyclohexane, more specifically to a method for preparing cyclohexanone and cyclohexanol by liquid-phase oxidation of cyclohexane. Background technique [0002] The oxidation of cyclohexane to prepare cyclohexanone and cyclohexanol is an important industrial reaction, and most of the cyclohexanone and cyclohexanol in the world are produced by this method. Cyclohexanone and cyclohexanol are the main intermediates for the preparation of caprolactam and adipic acid to obtain nylon-6 and nylon-66, and are also important organic chemical raw materials and industrial solvents. [0003] At present, the liquid-phase oxidation of cyclohexane in industrial production can be divided into two routes: non-catalyzed oxidation and catalytic oxidation. [0004] The non-catalytic oxidation method is to oxidize cyclohexane to cyclohexyl hydroperoxide and a small amount of cyclohexanone and cyclohexanol at highe...

Claims

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Application Information

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IPC IPC(8): C07C27/12C07C29/19C07C35/08C07C45/32C07C49/403
Inventor 李永祥王仲霞宗保宁闵恩泽
Owner CHINA PETROLEUM & CHEM CORP
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