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Method for improving productivity of cyclohexanol dehydrogenation device

A cyclohexanol and dehydrogenation technology, which is applied in the fields of dehydrogenation preparation, chemical instruments and methods, preparation of organic compounds, etc. Conducive to smooth operation, reduced dimerization, and reduced heat loss

Pending Publication Date: 2020-09-15
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0018] Aiming at the problem of low cyclohexanol dehydrogenation capacity in existing industrial production units due to the high content of cyclohexanone and intermediate components in crude cyclohexanol, the purpose of the present invention is to provide a method to improve the capacity of cyclohexanol dehydrogenation unit According to the method, the content of cyclohexanone in the crude alcohol is greatly reduced after the method is processed, and the content of intermediate components can be maintained in a low range at the same time, and the condensation side effects caused by cyclohexanone during the heating process of the cyclohexanol dehydrogenation raw material The reaction speed is greatly reduced, the conversion rate of cyclohexanol dehydrogenation is greatly increased, the selectivity of cyclohexanol dehydrogenation is improved, and the processing capacity of the cyclohexanol dehydrogenation unit is increased

Method used

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  • Method for improving productivity of cyclohexanol dehydrogenation device
  • Method for improving productivity of cyclohexanol dehydrogenation device

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0042] This embodiment adopts vacuum-atmospheric double-tower rectification to remove intermediate components:

[0043] The material crude alcohol from the top of the alcohol tower in the original production device is introduced into the crude alcohol tank, mixed with the refined refined alcohol as the material for the dehydrogenation process of decyclohexanol, and the flow rate is 12000kg / h. The material in the crude alcohol tank contains 91.22% of cyclohexanol, 4.13% of cyclohexanone and 4.65% of intermediate components.

[0044] The crude alcohol is sent to the middle part of the vacuum tower at a rate of 192.3kg / h for rectification and separation, and the bottom liquid of the vacuum tower is returned to the crude alcohol tank with a flow rate of 168.3kg / h; the distillate from the top of the vacuum tower is continuously discharged to Atmospheric tower, the flow rate is 24.0kg / h. The pressure at the top of the decompression tower is 3-4kPa, the reflux ratio is 15, the tempe...

Embodiment 2

[0048] This embodiment adopts deketone-decompression-atmospheric pressure three-tower rectification to remove intermediate components:

[0049] The material crude alcohol from the top of the alcohol tower in the original production device is introduced into the crude alcohol tank, mixed with the refined refined alcohol as the material for the dehydrogenation process of decyclohexanol, and the flow rate is 12000kg / h. The material in the crude alcohol tank contains 91.34% of cyclohexanol, 4.04% of cyclohexanone and 4.62% of intermediate components.

[0050] The crude alcohol is sent to the middle of the crude ketone tower at a rate of 217.4kg / h for rectification and separation, and the bottom liquid of the crude ketone tower is discharged to the vacuum tower with a flow rate of 208.7kg / h; the distillate from the top of the crude ketone tower is continuously discharged To the crude alcohol and ketone tank, the flow rate is 8.7kg / h. The pressure at the top of the crude ketone tow...

Embodiment 3

[0055] This embodiment adopts vacuum-atmospheric double-tower rectification to remove intermediate components:

[0056] The material crude alcohol from the top of the alcohol tower in the original production device is introduced into the crude alcohol tank, mixed with the refined refined alcohol as the material for the dehydrogenation process of decyclohexanol, and the flow rate is 12000kg / h. The material in the crude alcohol tank contains 93.56% of cyclohexanol, 2.97% of cyclohexanone and 3.47% of intermediate components.

[0057] The crude alcohol is sent to the middle of the vacuum tower at a rate of 312.5kg / h for rectification and separation, and the bottom liquid of the vacuum tower is returned to the crude alcohol tank with a flow rate of 287.5kg / h; the distillate from the top of the vacuum tower is continuously discharged to Atmospheric tower, the flow rate is 25.0kg / h. The pressure at the top of the decompression tower is 3-4kPa, the reflux ratio is 15, the temperatur...

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Abstract

The invention discloses a method for improving the productivity of a cyclohexanol dehydrogenation device. The method comprises the following steps: 1) feeding a crude cyclohexanol solution from a crude alcohol tank into a pressure reducing tower, carrying out pressure reducing rectification, feeding distillate at the top of the pressure reducing tower into a normal pressure tower, and returning the kettle liquid of the pressure reducing tower to the crude alcohol tank; and 2) carrying out atmospheric rectification separation on the tower top distillate of the pressure reducing tower in an atmospheric tower, returning the tower top distillate of the atmospheric tower to the crude alcohol tank, and discharging the kettle liquid of the atmospheric tower. According to the method, the content of intermediate components in the crude cyclohexanol can be gradually reduced, invalid circulation of the crude cyclohexanol in a cyclohexanol dehydrogenation system is reduced, the conversion rate ofthe cyclohexanol and the selectivity of cyclohexanone are improved, and the productivity of a cyclohexanol dehydrogenation device is improved.

Description

technical field [0001] The invention relates to a method for improving the production capacity of a cyclohexanol dehydrogenation device, belonging to the field of cyclohexanone preparation. Background technique [0002] The preparation of cyclohexanone by oxidation of cyclohexane usually goes through the following steps: [0003] (1) Oxidize cyclohexane with a gas containing molecular oxygen to generate a cyclohexane oxidation solution containing substances such as cyclohexyl hydroperoxide, cyclohexanol and cyclohexanone; [0004] (2) process cyclohexane oxidation liquid with alkaline solution, make cyclohexyl hydroperoxide wherein decompose and generate cyclohexanol and cyclohexanone, simultaneously the acid in the oxidation liquid is neutralized, and ester is saponified; [0005] (3) unreacted hexanaphthene is steamed out and recycled, and the rectifying still liquid not containing hexanaphthene enters the crude alcohol and ketone tank together with the cyclohexanol dehyd...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C29/80C07C35/08C07C45/00C07C49/403
CPCC07C29/80C07C45/002C07C2601/14C07C35/08C07C49/403
Inventor 周小文刘洪武潘罗其黎树根邓琼韩娟肖泽威
Owner CHINA PETROLEUM & CHEM CORP
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