Efficient energy-saving refining system for producing cyclohexanone through dehydrogenation

By using alcohol tower raw materials directly into the top of the tower in the cyclohexanone production process, the top of the tower is cancelled, and the heat and gas and liquid feeding of the alcohol ketone drying tower are optimized, the problems of high steam consumption and unqualified product purity are solved, and energy saving and product quality improvement of cyclohexanone production are achieved.

CN120502291APending Publication Date: 2025-08-19XUYANG ENG CO LTD
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Patent Information

Application Number
CN202510877382.4
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2025-06-27
Publication Date
2025-08-19

AI Technical Summary

Technical Problem

The current cyclohexanone production process has a large steam consumption, resulting in high energy consumption, and unqualified product purity and yield. Especially in the gas phase at the top of the second alcohol tower, the gas phase is prone to contain heavy components, resulting in unqualified cyclohexanol purity.

Method used

The alcohol tower raw materials are used to directly enter the top of the tower, the top reflux is cancelled, and the alcohol ketone drying tower is added to utilize the heat of the reaction product, and the gas and liquid feed is fed through the optimized design of the alcohol ketone drying tower and the dehydration tower to improve hydrogen purity and reduce steam consumption.

Benefits of technology

It realizes energy saving and consumption reduction in the cyclohexanone production process, reduces steam consumption by 28t/h, improves hydrogen purity and the quality of cyclohexanone products, and enhances the recovery rate of cyclohexanol.

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Abstract

The invention belongs to the technical field of chemical production, and particularly relates to an efficient energy-saving refining system for producing cyclohexanone through dehydrogenation, which comprises an alcohol tower, a dehydrogenation heat exchanger, a dehydrogenation reactor, an alcohol tower feeding heat exchanger, a dehydrating tower, a light tower I, a light tower II, a ketone tower and an alcohol recovery tower which are connected in sequence, a middle feeding port of the alcohol tower is communicated with a tube pass discharging port of the alcohol tower feeding heat exchanger, a top discharging port of the alcohol tower is communicated with a tube pass feeding port of the dehydrogenation heat exchanger, a bottom discharging port of the alcohol tower is communicated with a middle feeding port of the alcohol recovery tower, and an alcohol ketone drying tower is additionally arranged between the alcohol tower feeding heat exchanger and the dehydration tower. A feed port of the alcohol ketone drying tower is communicated with a shell pass discharge port of the alcohol tower feed heat exchanger, and a liquid phase discharge port of the alcohol ketone drying tower is communicated with an upper feed port of the dehydrating tower. The alcohol tower adopts a process that raw materials directly enter the tower top, tower top reflux is cancelled, steam consumption is reduced, and the purpose of saving energy is achieved.
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