Resource recycling device and process of dichloromethane tail gas

Abstract

The invention discloses a resource recycling device and process of dichloromethane tail gas. According to the device, the bottom of an absorption tower is connected with an absorbent heat exchanger through an absorption tower kettle extraction pump; the absorbent heat exchanger is connected to the upper part of an desorption tower; the absorbent heat exchanger is connected with an absorbent primary cooler; the bottom of a falling film evaporator is connected with the lower part of the desorption tower; the bottom of the desorption tower is connected with the top of the falling film evaporatorthrough a falling film circulating pump; a desorption tower top condenser is connected with the top of the desorption tower; the desorption tower top condenser is connected with the top of a desorption tower top receiving tank; the top of the desorption tower top receiving tank is connected with an after-pumping receiving tank through a vacuum pump; the vacuum pump is connected with the desorptiontower top condenser; the top of the after-pumping receiving tank is connected with an after-pumping condenser; and the top of the after-pumping condenser is connected to the lower part of the absorption tower. The device provided by the invention is simple in structure, convenient in operation, and high in solvent recovery rate; dangerous waste is not generated; the environment-friendly requirement can be met; the emission is safe; and resource recycling is realized.

Description

technical field [0001] The invention belongs to a synthesis process of a continuous production process, and in particular relates to a methylene chloride tail gas recycling device and a process for recycling methylene chloride tail gas resources by using the methylene chloride tail gas recycling device. Background technique [0002] Dichloromethane, a colorless transparent liquid, has a pungent odor similar to ether. It is a non-flammable low-boiling solvent, often used to replace flammable petroleum ether, ether, etc. The boiling point of dichloromethane is 39.75°C under normal pressure, insoluble in water, soluble in phenol, aldehyde, ketone, glacial acetic acid, triethyl phosphate, ethyl acetoacetate, and cyclohexylamine. Compatible with other chlorinated hydrocarbon solvents ethanol, ether and N,N-dimethylformamide. Dichloromethane has certain toxicity and is highly volatile, which is harmful to the human central nervous system and respiratory system, and its solution ...

AI Technical Summary

Problems solved by technology

[0009] The purpose of the present invention is to overcome the above-mentioned shortcomings, and to provide a methylene chloride tail gas resource recovery device for the problems of low boiling point, volatile and difficult recovery of methylene chloride tail gas

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