Carbon Dioxide Absorbent Based On Amine Having Nitrile Functional Group, and Carbon Dioxide Absorption Method and Separation Method Using Same

摘要

The present invention relates to a method for using, as a carbon dioxide absorbent, a secondary amine having a nitrile group, that is, a 3-(alkylamino)propionitrile compound. The absorbent based on the 3-(alkylamino)propionitrile compound and the carbon dioxide absorption method and separation method using same, according to the present invention, not only have an excellent carbon dioxide absorption capacity and a rapid carbon dioxide absorption rate, but also allow absorbent regeneration even at a considerably low temperature compared with a conventional alkanolamine-based absorbent and thus can significantly reduce the entire energy consumption required for an absorption process, and can also prevent recovered carbon dioxide from being contaminated with moisture and absorbent vapor, owing to the low regeneration temperature.

主权项

1. A carbon dioxide (CO2) absorbent based on an amine having a nitrile functional group, wherein the carbon dioxide absorbent contains a mixture of a 3-(alkylamino)propionitrile compound represented by Formula 3 and a secondary alkanolamine represented by Formula 4,
R1—NH—CH2—CH2—C≡N   Formula 3, wherein R1 represents a C1 to C6 alkyl group or a cycloalkyl group, R2 represents a C1 to C6 alkyl group, and R3 represents hydrogen or a methyl group.