National Institute of Advanced Industrial Science and Technology

Yo Yamato

Masao Iwaya

Mitsuhiro Kanakubo

Takashi Makino

Provide are an ionic liquid composition for a carbon dioxide separation membrane, a carbon dioxide separation membrane retaining the composition in voids, and a carbon dioxide concentration apparatus provided with the carbon dioxide separation membrane that can be used to separate carbon dioxide from high partial pressure to low partial pressure. The permeability of COand COselectivity ratio of the carbon dioxide separation membrane can be improved, and carbon dioxide from high partial pressure to a low partial pressure of 1 kPa or lower can be selectively separated and recycled by using an ionic liquid composition prepared by combining: an ionic liquid (I) that is an aminium having one or more primary or secondary amino groups and an ethylenediamine or propylenediamine backbone in the cation; and an ionic liquid (II) in which the cation has no primary or secondary amino group and the anion is an oxoacid anion.

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

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Tokyo, Japan

Yo Yamato