Aqueous solutions of amine functionalized ionic compounds for carbon capture processes

A process for separating carbon dioxide (CO2) from a carbon dioxide-containing gas stream, the process comprising:

• (a) contacting the carbon dioxide-containing gas stream with an aqueous ionic absorbent solution under absorption conditions to absorb at least a portion of the CO2 from the carbon dioxide-containing gas stream and form a CO2-absorbent complex;
• wherein the aqueous ionic absorbent solution has a viscosity of about 0.1 to about 100 centistokes (cSt) and further wherein the aqueous ionic absorbent solution comprises (i) about 40 wt. % to about 80 wt. % of one or more diluents, based on the total weight of the aqueous ionic absorbent solution;
• and (ii) an ionic absorbent selected from the group consisting of tetrabutylammonium N-propyl-N-(3-sulfopropyl)amine, tetrabutylphosphonium N-isopropyl-N-(3-sulfopropyl)amine, tetraethylammonium N-isopropyl-N-(3-sulfopropyl)amine and mixtures thereof;
• and
• (b) recovering a gaseous product having a reduced CO2.