Carbon dioxide absorber, rich carbon dioxide absorber preparation method, and carbon dioxide recovery method

摘要

PROBLEM TO BE SOLVED: To provide a novel use of a fluorine-containing phosphoric acid ester. SOLUTION: The carbon dioxide absorbing liquid contains a fluorine-containing phosphoric acid ester. The method for preparing a rich carbon dioxide absorbing solution includes contacting the carbon dioxide absorbing solution with carbon dioxide or a mixed gas containing carbon dioxide to allow the carbon dioxide absorbing solution to absorb carbon dioxide. The method for recovering carbon dioxide is to set the rich carbon dioxide absorbing liquid obtained by the method for preparing the rich carbon dioxide absorbing liquid to a lower pressure than the pressure at which carbon dioxide is absorbed and / or to a temperature higher than the temperature at which the carbon dioxide is absorbed. This includes releasing carbon dioxide from the rich carbon dioxide sink. [Selection diagram] None