US 11,986,778 B2
Gas separation apparatus, method of gas separation, and gas separation membrane
Kenichi Noda, Nagoya (JP)
Assigned to NGK INSULATORS, LTD., Nagoya (JP)
Filed by NGK INSULATORS, LTD., Nagoya (JP)
Filed on Jul. 22, 2020, as Appl. No. 16/935,553.
Application 16/935,553 is a continuation of application No. PCT/JP2019/004202, filed on Feb. 6, 2019.
Claims priority of application No. 2018-024973 (JP), filed on Feb. 15, 2018.
Prior Publication US 2020/0346171 A1, Nov. 5, 2020
Int. Cl. B01D 71/02 (2006.01); B01D 53/22 (2006.01); B01D 69/10 (2006.01)
CPC B01D 71/02 (2013.01) [B01D 53/228 (2013.01); B01D 69/10 (2013.01); B01D 2053/221 (2013.01); B01D 2257/102 (2013.01); B01D 2257/504 (2013.01); B01D 2311/10 (2013.01)] 19 Claims
OG exemplary drawing
 
1. A gas separation apparatus comprising:
a gas supply part that supplies a mixed gas containing at least methane, carbon dioxide, and nitrogen at a pressure greater than or equal to 10 atm and less than or equal to 200 atm, a water content of said mixed gas being less than or equal to 3000 ppm; and
a separation membrane that allows carbon dioxide and nitrogen in said mixed gas to permeate therethrough, to thereby separate carbon dioxide and nitrogen from methane, wherein
said separation membrane is made of zeolite,
said zeolite contains aluminum,
a ratio of alkali metal to whole framework elements in said zeolite is less than or equal to 6.0 mol %,
an amount of substance of said alkali metal in said zeolite is less than an amount of substance of said aluminum, and
a ratio of alkaline earth metal to whole framework elements in said zeolite is less than or equal to 0.2 mol %.