Process for capturing co2 from a co2-containing gas stream involving phase separation of aqueous absorbent

A process for capturing CO2 from a CO2-containing gas stream, comprising:

• (a) contacting a CO2-containing gas stream with a CO2-absorbing agent in an absorption step wherein the temperature of the CO2 absorbing agent at the end of the absorption step is below the Lower Critical Solution Temperature (LCST) of the CO2-absorbing agent at the end of the absorption step, resulting in absorption of CO2;
• (b) increasing the temperature of the CO2-absorbing agent, wherein the temperature at the end of the desorption step is above the LCST of the CO2-absorbing agent at the end of the desorption step, resulting in the desorption of CO2;
• wherein the CO2-absorbing agent is a thermoresponsive CO2-absorbing agent comprising an amine-containing component, a solute inorganic salt, and water, and wherein the amine-containing component has a boiling point of at least 100° C. and the solute inorganic salt has a solubility in water of at least 0.01 mole/liter (determined at 20° C.).