Device for separating and recycling tail gas generated in polypropylene production

Abstract

The invention relates to a device for separating and recycling tail gas generated in polypropylene production. The device adopts a compressing and condensing system, a precise bag type-microporous membrane filtering system and an intelligent monitoring system to separate and recycle propylene, hydrogen and nitrogen in tail gas step by step, the separating effect is obvious, the separating efficiency of a C3 composition is high, zero emission of tail gas is realized, and besides, the device adopts a skid-mounted type structure, so that the operation and maintenance are simple and convenient, the occupied land is small, and the economic benefit is remarkable.

Description

technical field [0001] The invention relates to a tail gas separation and recovery device, in particular to a tail gas separation and recovery device in the polypropylene production process. Background technique [0002] During the polymerization of polypropylene, in order to prevent the accumulation of inert gas in the reactor, part of the gas is discharged as purge gas, which contains a certain amount of propylene monomer. Generally, the propylene monomer in the purge gas is recovered by the compression condensation process to reduce the unit consumption of production. However, due to the constraints of pressure and condensation temperature, the non-condensable gas still contains a large amount of high-concentration propylene monomer and cannot be recovered. The content of propylene entrained in the non-condensable gas produced in the production process of polypropylene after compression and condensation is about 50% or higher, followed by nitrogen and hydrogen. If they ar...

AI Technical Summary

Problems solved by technology

Generally, the compression condensation process is used to recover the propylene monomer in the purge gas to reduce the unit consumption of production. However, due to the constraints of pressure and condensation temperature, the non-condensable gas still contains a large amount of high-concentration propylene monomer and cannot be recovered.

The content of propylene entrained in the non-condensable gas produced in the production process of polypropylene after compression and condensation is about 50% or higher, followed by nitrogen and hydrogen. If they are not separated and recovered, it will cause a great waste of resources and environmental Pollution

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