Drying tower negative pressure drying process

Abstract

The invention belongs to the technical field of cyclohexanone production process in chemical industry and in particular relates to a negative pressure drying process for a drying tower. The negative pressure drying process for the drying tower has the advantages that evaporation, condensation and reflux are carried out, so that water content of cyclohexane is reduced, and recovery rate of cyclohexane is also increased; technological operation is simple, technological indexes can be easily controlled, safety and reliability are realized, recovery rate of cyclohexane in the drying tower is increased and water removal effect is improved after the negative pressure drying process for the drying tower is adopted, especially the condition that a large amount of low-pressure steam is discharged out is avoided, medium pressure steam with high thermal energy is saved, and steam resource is effectively recycled.

Description

[0001] (1) Technical field [0002] The invention relates to a drying tower negative pressure drying process, which belongs to the technical field of cyclohexanone production process in the chemical industry. [0003] (2) Background technology [0004] Most of the existing chemical enterprises have built a lot of chemical equipment for production needs, such as circulating fluidized bed boilers. During the chemical production process, circulating fluidized bed boilers will generate a certain amount of steam due to synthetic ammonia, dilute nitric acid, concentrated nitric acid, etc. In order to effectively Utilize heat energy and increase flue gas waste heat recovery project. This project will also generate a certain amount of low-pressure steam. However, existing devices and new devices cannot be fully utilized, and some remaining steam needs to be directly emptied into the atmosphere, resulting in a large amount of energy waste. At the same time The low-pressure steam thermal...

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Problems solved by technology

[0004] Most of the existing chemical enterprises have built a lot of chemical equipment for production needs, such as circulating fluidized bed boilers. During the chemical production process, circulating fluidized bed boilers will generate a certain amount of steam due to synthetic ammonia, dilute nitric acid, concentrated nitric acid, etc. In order to effectively Utilize heat energy and increase flue gas waste heat recovery project. This project will also generate a certain amount of low-pressure steam. However, existing devices and new devices cannot be fully utilized, and some remaining steam needs to be directly emptied into the atmosphere, resulting in a large amount of energy waste. At the same time The low-pressure steam thermal power company required for chemical production cannot directly supply it, and needs to add temperature and pressure reduction devices and pipelines again. The one-time investment is relatively large, and the loss of heat energy conversion is also relatively large, which does not conform to the principle of economical production.

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