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Process for preparing cyclohexanone by cyclohexanol dehydrogenation

A technology of cyclohexanol and cyclohexanone, which is applied in the field of preparation of cyclohexanone, can solve problems such as unqualified product quality, achieve the effects of reducing circulation and accumulation, reducing side reactions, and reducing steam consumption

Active Publication Date: 2017-02-22
长沙兴和新材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

When impurities such as methylcyclohexanone and heptanone in the system accumulate to a certain extent, the content of such impurities in the cyclohexanone product will rise to 100-200ppm, resulting in unqualified product quality

Method used

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  • Process for preparing cyclohexanone by cyclohexanol dehydrogenation
  • Process for preparing cyclohexanone by cyclohexanol dehydrogenation
  • Process for preparing cyclohexanone by cyclohexanol dehydrogenation

Examples

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Effect test

Embodiment 1

[0039] Such as figure 2 As shown, it is a schematic diagram of the equipment and flow chart of the cyclohexanol dehydrogenation process in the newly built 100,000 tons / year cyclohexanol dehydrogenation process to prepare cyclohexanone in a certain factory. The equipment of the cyclohexanol dehydrogenation process in the described technology is made up of 1# normal pressure deheptanone tower 51, 2# normal pressure deheptanone tower 52 and cyclohexanol dehydrogenation reactor 3; Pressure removal heptanone tower 51 and 2# atmospheric pressure removal heptanone tower 52 are only provided with a stripping section, and the bottom of the still is respectively provided with 1# reboiler 41 and 2# reboiler 42; Heptanone tower 51 and 2# normal pressure deheptanone tower 52 are two towers connected in series, both are plate wave packed towers, the minimum theoretical total number of plates is calculated as 26 by the following method, wherein, 1# normal pressure deheptanone The actual pl...

Embodiment 2

[0051] Such as image 3 As shown, it is a schematic diagram of the equipment and flow chart of the cyclohexanol dehydrogenation process in the process of preparing cyclohexanone from cyclohexanol dehydrogenation of 100,000 tons per year after the transformation of the existing equipment in a certain factory. The equipment of the cyclohexanol dehydrogenation process in the described technology is made up of cyclohexanol evaporator 1, gas-liquid separator 2, normal pressure removing heptanone tower 5 and cyclohexanol dehydrogenation reactor 3, promptly in existing Device (such as the comparative example) between the gas-liquid separator 2 and the cyclohexanol dehydrogenation reactor 3, an atmospheric pressure heptanone removal tower 5 is added; the atmospheric pressure heptanone removal tower 5 is only provided with a stripping section, and the bottom A reboiler 4 is provided; the atmospheric pressure deheptanone tower 5 is a plate-wave packing single tower, and the minimum theo...

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Abstract

The invention discloses a process for preparing cyclohexanone by cyclohexanol dehydrogenation. Equipment for a cyclohexanol dehydrogenation procedure comprises a normal pressure or pressurized rectifying column and a cyclohexanol dehydrogenation reactor, the rectifying column is only provided with a stripping section, a column reactor is provided with a reboiler, and a cyclohexanone evaporator and a gas-liquid separator are sequentially arranged in the cyclohexanol dehydrogenation procedure. The process is used for a 100 thousand ton / year cyclohexanone production device, the concentration of methyl cyclohexanone, heptanone and analogues of the methyl cyclohexanone and the heptanone among materials in a cyclohexanone rectifying procedure and the cyclohexanol dehydrogenation procedure can be reduced from 10-13% to 1-2%, so that side reaction of dehydrogenation reaction is decreased, the quality of cyclohexanone products is improved, the service life of cyclohexanol dehydrogenation catalysts is prolonged, circulation and accumulation of the methyl cyclohexanone, the heptanone and the analogues of the methyl cyclohexanone and the heptanone in the cyclohexanone rectifying procedure and the cyclohexanol dehydrogenation procedure are decreased, and steam consumption is also greatly reduced.

Description

technical field [0001] The present invention specifically relates to a preparation process of cyclohexanone, in particular to a process for preparing cyclohexanone by dehydrogenating cyclohexanol. Background technique [0002] Cyclohexanone is an important organic chemical product with a wide range of uses. China is now the world's largest producer and technological power of cyclohexanone products, with an annual production capacity of more than 3 million tons, accounting for about 50% of the world's total production capacity. There are currently three main technical routes for the production of cyclohexanone: among them, cyclohexane oxidation is the most important route, accounting for more than 65% of the total production capacity; in addition, cyclohexene hydration is developing rapidly, accounting for about 25% of the total production capacity ; The last is the phenol hydrogenation method, which is less than 10% of the total production capacity. No matter which technic...

Claims

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Application Information

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IPC IPC(8): C07C45/29C07C49/303
CPCC07C45/29C07C49/303
Inventor 肖藻生肖有昌
Owner 长沙兴和新材料有限公司
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