Abstract of  JP2004105942  (A)

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PROBLEM TO BE SOLVED: To provide a DDR (deca-dodecasil 3R) type zeolite membrane which has excellent pressure resistance and heat resistance, is hardly plasticized by CO<SB>2</SB>and is hardly deteriorated by a liquefied hydrocarbon and with which one or more specified gas components can be separated from a mixed gas such as natural gas containing two or more specified gas components, and to provide a gas separating method and a gas separating apparatus in each of which this DDR type zeolite membrane is used. ; SOLUTION: This DDR type zeolite membrane is obtained by depositing silica-based DDR type zeolite on a substrate and has such gas permeability that the permeability of one of at least two gases is different from that of the other of them when each of them is permeated through this DDR type zeolite membrane as a single component at room temperature or at 100[deg.]C. At least two gases are selected from the group consisting of carbon dioxide (CO<SB>2</SB>), hydrogen (H<SB>2</SB>), oxygen (O<SB>2</SB>), nitrogen (N<SB>2</SB>), methane (CH<SB>4</SB>), normal butane (n-C<SB>4</SB>H<SB>10</SB>), isobutane (i-C<SB>4</SB>H<SB>10</SB>), sulfur hexafluoride (SF<SB>6</SB>), ethane (C<SB>2</SB>H<SB>6</SB>), ethylene (C<SB>2</SB>H<SB>4</SB>), propane (C<SB>3</SB>H<SB>8</SB>), propylene (C<SB>3</SB>H<SB>6</SB>), carbon monoxide (CO), nitrogen monoxide (NO) and water (H<SB>2</SB>O). ; COPYRIGHT: (C)2004,JPO