Novel coupling film separating method and device used in gas separation

Abstract

The invention relates to a method for gas separating, a device thereof and a novel coupled film separation method for gas separating. The material gas is separated through a plurality of separation units, the material gas of each separation unit is firstly contacted with the gas separation film of one side, the gas component forming ligand structure with carrier solution by the form of improving transfer is firstly dissolving and diffusing in the gas separation film contacted therewith, then forms ligand structure with the carrier solution to pass the thin carrier solution and contact with the gas separation film at the other side by the form of improving transfer, and desorbs at the infiltration side by dissolving and diffusing in the gas separation film; the gas component in the material gas which can not form ligand structure with carrier solution is firstly dissolving and diffusing in the gas separation film contacted therewith, then contacts with the gas separation film at the other side by the form of dissolving and diffusing in the thin carrier solution, and desorbs at the infiltration side by dissolving and diffusing in the gas separation film to arrive at the purpose for separating the material gas. The separation method of the invention can satisfy the demand for the gas high pressure separating, avoid plastic effect, prevent wetness and leak of the film, and maintain long-time 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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