| 摘要 |
A method of separating a gas, especially carbon dioxide, from a gas mixture of the gas and nitrogen at a low temperature of -20 DEG C. to 50 DEG 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 CO2 permeation rate of 1x10-4 to 5x10-2N cm3/(cm2cm Hg sec) at 25 DEG C. and a CO2/N2 separation factor of 10 to 200 at 25 DEG C.
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