Novel coupling film separating method and device used in gas separation

Abstract

The invention relates to a gas separation method and device, a coupling membrane separation method for gas separation, raw material gas is separated through a plurality of separation units, each separation unit raw material gas is first in contact with a gas separation membrane on one side, and can be formed with a carrier solution The ligand is first dissolved and diffused in the gas separation membrane that is in contact with it through the gas component that facilitates the transfer, and then forms a ligand structure with the carrier solution to facilitate the transfer. The dissolution and diffusion in the gas separation membrane is desorbed on the permeation side; the gas components in the raw gas that cannot form ligands with the carrier solution first dissolve and diffuse in the gas separation membrane in contact with it, and then dissolve and diffuse in the thin layer of carrier solution The form is in contact with the gas separation membrane on the other side, and desorbs on the permeation side through dissolution and diffusion in the gas separation membrane to achieve the purpose of separating the raw gas. The separation method of the present invention not only satisfies the requirement of high-pressure gas separation, eliminates plastic effect, but also prevents membrane wetting and leakage, and maintains long-term stability.

Description

Technical field: [0001] The present invention relates to a gas separation method, and also to a gas separation device. Background technique: [0002] Gas separation is a very important processing method in the chemical industry, especially olefin / alkane separation has always occupied a very important position in the chemical industry. Ethylene and propylene are chemical raw materials with the largest and second largest output in petrochemical industry. At present, the separation technologies of olefins / alkanes mainly include cryogenic rectification, pressure swing adsorption, lean oil absorption, extractive distillation, etc. These processes generally have poor selectivity, low separation coefficient and high energy consumption. At present, the raw materials for olefin production mainly come from crude oil (naphtha, diesel, propane, etc.) and natural gas (ethane, propane, etc.). Since olefins / alkanes have very similar boiling points, the distillation column used for separa...

AI Technical Summary

Problems solved by technology

In its U.S. Patent 5670051 (1997), Pinnau et al. put Ag + Embedded in a polymer membrane to form a so-called solid polymer electrolyte membrane, but the poor chemical stability of olefin supports seriously hinders the industrialization of this separation process

At the same time, Nymeijer et al pointed out that Ag + For trace H 2 Gases such as S and acetylene are more sensitive, including Ag + The solid polymer electrolyte membrane regeneration process is also very difficult and complicated, and these factors are urgent problems to be solved in the current industrialization

[0006] To sum up, for the separation of olefins / alkanes, there are serious industrial bottlenecks in the technical routes of gas separation membranes, carrier-facilitated transfer composite membranes, and supported liquid membranes, which restrict the development of the industrialization process.

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