A kind of method and device for preparing isopropyl acetate by reaction of propylene and acetic acid

Abstract

The invention discloses a method for preparing isopropyl acetate through reaction of propylene and acetic acid. The method is characterized by comprising the following steps: (A) mixing an inert component with propylene and acetic acid, and feeding into a fixed bed reactor for reaction; (B) feeding the reacted mixture into a heavy component removal tower for removing heavy components; (C) condensing the tower top product of the heavy component removal tower, feeding into a light component removal tower for further separation, condensing the tower top product of the light component removal tower, feeding back a part of the condensed product to the tower top for backflow, feeding back a part of the condensed part to a reaction system for recycling and reuse, and discharging out an isopropyl acetate product from a side line of the column bottom. By adopting the method, the reaction acid-alkene ratio is reduced, the operation pressure of the reaction system is reduced, the treatment capacity of the heavy component removal tower is increased, the energy consumption is reduced, conventional processes and equipment can be used, propylene which is discharged out at present can be effectively recycled, the material consumption is reduced, the influence caused by discharged propylene to the environment is reduced, the potential safety hazard is eliminated, the separation process procedures are shortened, and the equipment investment is reduced.

Description

technical field [0001] The invention relates to a method and a device for preparing isopropyl acetate by reacting propylene and acetic acid, in particular to a method for recovering the tail gas of a device for preparing isopropyl acetate by reacting propylene and acetic acid by introducing an inert component in the reaction, which is prepared from propylene and acetic acid A method and device for preparing isopropyl acetate by reacting acetic acid. Background technique [0002] Isopropyl acetate is a colorless, liquid with a pleasant fruity aroma. Slightly soluble in water, miscible with most solvents such as alcohols, ketones, ethers, etc., known as "universal solvent", it has excellent dissolving ability for various synthetic resins and natural resins. Because it has better performance than ethyl acetate and n-butyl acetate, its solubility is better than ethyl acetate, and its volatility is better than n-butyl acetate, so it can replace ethyl acetate and n-butyl acetate ...

AI Technical Summary

Problems solved by technology

This method involves the separation process of isopropyl acetate, but does not involve the recovery method of the device tail gas

[0012] The exhaust gas recovery method of the isopropyl acetate unit is not mentioned in the existing technology. Although the conversion rate of propylene in this reaction can be as high as more than 95%, there is still a small amount of propylene that has not reacted completely. The existing technology does not convert this part of propylene. recycling, but directly to the atmosphere

Due to the small amount of propylene exhausted to the atmosphere, the use of cryogenic technology for recovery or compressor technology for recovery requires high energy consumption and is not economical. Therefore, this part of propylene is not recovered in the prior art, resulting in Especially in the later stage of catalyst use, with the decrease of propylene conversion rate, the loss of propylene will increase. At the same time, the direct discharge of propylene to the atmosphere will pollute the environment, and there will be a greater safety hazard in thunderstorm weather.

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