Gas separation – Means within gas stream for conducting concentrate to collector
Patent
1986-07-15
1988-05-24
Anderson, Philip
Gas separation
Means within gas stream for conducting concentrate to collector
55 16, 55 68, 264 41, B01D 5322, B01D 1304, C08J 928
Patent
active
047463333
ABSTRACT:
A method of manufacturing an integral asymmetric membrane for separating gases from each other, wherewith a membrane-former, a solvent, and/or an agent which is not a solvent for the membrane-former are mixed, are spread out or otherwise extended over a greater area, and are contacted with a precipitation agent. The integral asymmetric membrane for gas separation is particularly suitable for CO.sub.2 /CH.sub.4 separation, has improved insensitivity to water and relatively high strength and durability, and has high separation throughput and selectivity (permeability of .gtoreq.=0.1 cu m/sq m/hr/bar for CO.sub.2, and CO.sub.2 /CH.sub.4 selectivity of about 30-40), which high separation throughput and selectivity are necessary for economical separation of materials. The integral asymmetric membrane is made from a polymer, particularly polyether sulfone, as a membrane-former, is mixed with a halogenated hydrocarbon, as a solvent, as well as with a non-solvent in the form of an aliphatic alcohol, which non-solvent may possibly comprise, in addition to the aliphatic alcohol, an aliphatic carboxylic acid or an alkylbenzene.
REFERENCES:
patent: 4026977 (1977-05-01), Bourganel
patent: 4673418 (1987-06-01), Peinemann et al.
C. Glen Wensley et al., "High Performance Gas Separation Membranes", American Institute of Chemical Engineers, 1984 Winter National Meeting (1984).
R. T. Chern, Material Science of Synthetic Membranes, ACS Symposium Series, vol. 269, pp. 25-46 (American Chemical Society 1985).
Peinemann Klaus V.
Pinnau Ingo
Anderson Philip
Kernforschungszentrum Karlsruhe GmbH
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