US 12,330,123 B2
Ionic liquid composition for carbon dioxide separation membrane, carbon dioxide separation membrane holding said composition, and carbon dioxide concentration apparatus provided with said carbon dioxide separation membrane
Takashi Makino, Sendai (JP); Mitsuhiro Kanakubo, Sendai (JP); Masao Iwaya, Tokyo (JP); and Yo Yamato, Tokyo (JP)
Assigned to NATIONAL INSTITUTE OF ADVANCED INDUSTRIAL SCIENCE AND TECHNOLOGY, Tokyo (JP)
Appl. No. 17/798,745
Filed by NATIONAL INSTITUTE OF ADVANCED INDUSTRIAL SCIENCE AND TECHNOLOGY, Tokyo (JP); and DAICEL CORPORATION, Osaka (JP)
PCT Filed Feb. 16, 2021, PCT No. PCT/JP2021/005629
§ 371(c)(1), (2) Date Aug. 10, 2022,
PCT Pub. No. WO2021/172087, PCT Pub. Date Sep. 2, 2021.
Claims priority of application No. 2020-029112 (JP), filed on Feb. 25, 2020.
Prior Publication US 2023/0099980 A1, Mar. 30, 2023
Int. Cl. B01D 69/14 (2006.01); B01D 53/22 (2006.01); B01D 69/12 (2006.01); B01D 71/02 (2006.01); B01D 71/36 (2006.01); C07C 53/10 (2006.01); C07C 59/125 (2006.01); C07C 211/63 (2006.01); C07C 311/48 (2006.01); C07D 233/58 (2006.01)
CPC B01D 69/1411 (2022.08) [B01D 53/228 (2013.01); B01D 69/1213 (2022.08); B01D 71/05 (2022.08); B01D 71/36 (2013.01); C07C 53/10 (2013.01); C07C 59/125 (2013.01); C07C 211/63 (2013.01); C07C 311/48 (2013.01); C07D 233/58 (2013.01)] 14 Claims
OG exemplary drawing
 
1. A method of separating carbon dioxide by using an ionic liquid composition, comprising:
preparing a membrane having a porous layer; and
retaining the ionic liquid composition in voids in the porous layer;
wherein the ionic liquid composition contains
an ionic liquid (I) and
an ionic liquid (II),
wherein a cation in the ionic liquid (I) is an aminium having:
one or more primary or secondary amino groups; and
an ethylenediamine or propylenediamine backbone,
wherein
an anion in the ionic liquid (I) is bis(trifluoromethylsulfonyl)amide, and
a cation in the ionic liquid (II) has no primary or secondary amino group, and
an anion in the ionic liquid (II) is an oxoacid anion, wherein the oxoacid anion is selected from the group consisting of carboxylates, phosphates, phosphonates, and combinations thereof.