Gas separation: processes – Selective diffusion of gases – Selective diffusion of gases through substantially solid...
Patent
1996-05-29
1998-01-20
Spitzer, Robert
Gas separation: processes
Selective diffusion of gases
Selective diffusion of gases through substantially solid...
95 45, B01D 5322
Patent
active
057097330
ABSTRACT:
A method of separating a gas, especially carbon dioxide, from a gas mixture of the gas and nitrogen at a low temperature of -20.degree. C. to 50.degree. C. using a gas separation membrane permeable to the gas, including the step of cooling the gas mixture using at least one cooling medium selected from the group consisting of liquefied petroleum gas and liquefied natural gas. The liquefied petroleum gas comprises at least one selected from the group consisting of propane gas and butane gas in an amount of more than 50 vol. %. The gas separation membrane has a CO.sub.2 permeation rate of 1.times.10.sup.-4 to 5.times.10.sup.-2 N cm.sup.3 /(cm.sup.2 cm Hg sec) at 25.degree. C. and a CO.sub.2 /N.sub.2 separation factor of 10 to 200 at 25.degree. C.
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Hachisuka Hisao
Ikeda Kenichi
Inoue Ken-ichi
Nitto Denko Corporation
Spitzer Robert
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