Patent ID: 8287627

Claim:
A carbon dioxide absorbent prepared by dissolving 3 to 60 wt. % of a piperazinium trifluoroacetate compound represented by the following formula 1 in an ionic liquid: wherein R 1 represents H or a C 1-8 alkyl group, a hydroxyl group, or an amine group, and wherein the ionic liquid comprises at least one selected from the group consisting of dimethylimidazolium dimethylphosphate, dimethylimidazolium methylphosphite, ethylmethylimidazolium diethylphosphate, ethylmethylimidazolium ethylphosphite, diethylimidazolium diethylphosphate, diethylimidazolium ethylphosphite, ethylmethylimidazolium dimethylphosphate, ethylmethylimidazolium methylphosphite, butylmethylimidazolium dimethylphosphate, butylmethylimidazolium methylphosphite, butylmethylimidazolium dibutylphosphate, butylmethylimidazolium butylphosphite, butylethylimidazolium dibutylphosphate, butylethylimidazolium butylphosphite, butylethylimidazolium diethylphosphate, butylethylimidazolium ethylphosphite, dibutylimidazolium dibutylphosphate, and dibutylimidazolium butylphosphite.