To provide a carbon dioxide gas absorbent and a method of recovering carbon dioxide gas, reducing energy required for releasing and recovering absorbed carbon dioxide gas.
Gas containing carbon dioxide gas is brought into contact with a water soluble polymer-containing aqueous solution containing the carbon dioxide gas absorbent containing a water soluble polymer compound having a nitrogen-containing compound expressed in formula (1) as a repeating unit, to absorb carbon dioxide gas, then the water soluble polymer-containing aqueous solution is separated into a hydrophobic first phase and a hydrophilic second phase. In the formula, R1: -CsHt- (1≤s≤10, t=2s-1) (straight chain, branch included), R2: -H, -CsHtOuNv (1≤s≤5, 2s≤t≤2s+2, 0≤u≤3, 0≤v≤3) (straight chain, branch included). Then the carbon dioxide gas is released from the first phase of the water soluble polymer-containing aqueous solution.
COPYRIGHT: (C)2010,JPO&INPIT
Takehiko Muramatsu
Yasuhiro Kato
Kondo Ari
Satoshi Saito
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Saichi Suyama
Hideaki Suyama
Yukio Kawahara
Satoshi Yamashita
Hiroshi Kumai