Gas separation – Means within gas stream for conducting concentrate to collector
Patent
1978-03-20
1979-12-25
Spitzer, Robert H.
Gas separation
Means within gas stream for conducting concentrate to collector
55158, B01D 5322
Patent
active
041803884
ABSTRACT:
Processes are disclosed for separating at least one gas from a gaseous feed mixture containing at least one other gas comprising passing the gaseous feed mixture to at least two permeator stages in series. Each permeator stage contains a separation membrane which has a feed side and a permeate exit side and exhibits selective permeation of the at least one gas as compared to the permeation of the at least one other gas of the gaseous mixture. A total pressure differential is maintained across the thickness of the separation membrane in each permeator stage to provide a driving force for the permeation of the at least one gas across the separation membrane. The ratio of total pressure on the feed side to total pressure on the permeate exit side of the separation membrane for at least one permeator stage is less than the ratio of total pressure on the feed side to total pressure on the permeate exit side of the separation membrane for at least one subsequent, i.e., downstream, permeator stage. The at least one gas of the gaseous feed mixture permeates through the membrane, and a permeating gas containing the at least one gas is obtained on the permeate exit side of each of the permeator stages. Between permeator stages, the non-permeating gas from one permeator stage is passed to the feed side of the next permeator stage.
REFERENCES:
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patent: 3339341 (1967-09-01), Maxwell et al.
patent: 3350844 (1967-11-01), Robb
patent: 3713271 (1973-01-01), Franz et al.
patent: 3836457 (1974-09-01), Gross et al.
patent: 4000065 (1976-12-01), Ladha et al.
Hwang et al., Operating Lines in Cascade Separation of Binary Mixtures, The Canadian Journal of Chem. Eng., Feb. 1965, pp. 36-39.
Graham Tommy E.
Maclean Donald L.
Balmer Norman L.
Monsanto Company
Spitzer Robert H.
Stanley Howard C.
Williams, Jr. James W.
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