Method for efficiently separating cyclohexanone and removing impurities in cyclohexanol

A technology of cyclohexanol and cyclohexanone, applied in the field of preparation of cyclohexanone, can solve the problems of high energy consumption, removal and consumption without optimized engineering design, and achieve the advantages of reducing equipment investment, reducing floor space and eliminating accumulation phenomenon. Effect

Pending Publication Date: 2021-03-19
CHINA PETROLEUM & CHEM CORP +1
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

When refining the intermediate components in the cyclohexanol feed to the dehydrogenation reactor, the engineering design and operating conditions of the cyclohexanol column were not optimized to remove impurities in the cyclohexanol, but only the feed to the dehydrogenation reactor was cooled After heating, one strand is separated, and these impurities are partially removed by tank flash evaporation or column rectification, which requires additional energy consumption, and the amount of processed materials should not be too large, otherwise the energy consumption will be higher

Method used

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  • Method for efficiently separating cyclohexanone and removing impurities in cyclohexanol
  • Method for efficiently separating cyclohexanone and removing impurities in cyclohexanol

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Effect test

Embodiment 1

[0037] The separation of alcohol and ketone in the cyclohexanone plant with an annual output of 150,000 tons of cyclohexane alkoxylation adopts the high-efficiency separation and impurity removal process flow of the present invention, the next-door tower adopts structured packing, and the impurity removal tower adopts a plate tower, such as figure 1 shown.

[0038] The crude alcohol and ketone from the bottom of the light removal tower enters the feed side of the dividing wall tower, the feed amount is 40t / h, and the feed composition is 42w% of cyclohexanol, 51.7w% of cyclohexanone, 5.1w% of intermediate components, and 0.3 w%. The operating pressure at the top of the next wall tower is 3KPaA, and the operating temperature is 55°C. The gas phase at the top of the tower is cooled by the condenser, and part of it is refluxed to the top of the tower. The reflux ratio at the top of the tower is 3.5. Score ≥ 99.95%; the internal reflux ratio of the liquid collector tank above the ...

Embodiment 2

[0043] The separation of alcohol and ketone in the cyclohexanone plant with an annual output of 150,000 tons of cyclohexane alkoxylation adopts the high-efficiency separation and impurity removal process flow of the present invention, the next-door tower adopts structured packing, and the impurity removal tower adopts a plate tower, such as figure 1 shown.

[0044] The crude alcohol and ketone from the bottom of the light removal tower enters the feed side of the dividing wall tower. The feed amount is 44t / h. The feed composition is 44.34w% of cyclohexanol, 51.20w% of cyclohexanone, 3.5w% of intermediate components, and 0.9w%. The operating pressure at the top of the next wall tower is 4KPaA, and the operating temperature is 56°C. The gas phase at the top of the tower is cooled by the condenser, and part of it is refluxed to the top of the tower. The reflux ratio at the top of the tower is 3.8. Score ≥ 99.96%; the internal reflux ratio of the liquid collecting tray above the ...

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Abstract

The invention discloses a method for efficiently separating cyclohexanone and removing impurities in cyclohexanol. The method comprises the following steps that crude alcohol ketone from the bottom ofa light component removal tower enters a dividing wall tower, a cyclohexanone product is extracted from the top of the dividing wall tower, cyclohexanol is extracted from a side line, cyclohexanol-containing intermediate ether components and heavy substances extracted from the bottom of the tower enter an impurity removal tower, the intermediate ether components and the heavy substances are continuously removed from the tower bottom of the impurity removal tower, and cyclohexanol extracted from the tower top of the impurity removal tower and cyclohexanol extracted from the side line of the dividing wall tower are combined and then directly used as a feed of a dehydrogenation reactor. According to the invention, the purpose of refining cyclohexanone and cyclohexanol is achieved, the etherintermediate components in cyclohexanol can be flexibly removed on line, and the energy consumption, investment and construction land occupation of an alcohol-ketone separation device are reduced.

Description

technical field [0001] The invention belongs to the technical field of preparation of cyclohexanone, in particular to a method for efficiently separating cyclohexanone and removing impurities in cyclohexanol. Background technique [0002] Cyclohexanone is the main intermediate in the production of caprolactam and adipic acid, and is also an important industrial solvent. At present, the production methods of cyclohexanone mainly include cyclohexane oxidation method, cyclohexene hydration method and phenol hydrogenation method. During the process of catalytic dehydrogenation of cyclohexanol generated by these production methods to generate cyclohexanone, Unavoidable light and heavy impurities, and more of these impurities are generated during cyclohexane oxidation. [0003] The separation and purification process of cyclohexanone products and dehydrogenation reaction raw material cyclohexanol is generally: crude alcohol and ketone after cyclohexanol dehydrogenation (for the c...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C45/00C07C45/78C07C45/82C07C49/403C07C29/74C07C29/80C07C35/08
CPCC07C45/002C07C45/78C07C45/82C07C29/74C07C29/80C07C2601/14C07C49/403C07C35/08
Inventor 潘罗其陈正朝李勇军赵华平杜建文
Owner CHINA PETROLEUM & CHEM CORP
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