Liquid amine functional, aqueous blends and the CO2 absorption capacity: Molecular structure, size, interaction parameter and mechanistic aspects

Increase in CO2 concentration in the atmosphere is one of the major areas of concerns for researchers. In various methods employed so far for CO2 capture, chemical absorption is one of the most favourable methods. Among the solvents used for CO2 absorption, amines are found with better CO2 capture capacity and rate, moreover under diluted flue gas typically derived from combustion processes. Absorption capacity of amine is depending on a number of factors including reaction conditions and amine structure. Structural dependence of amine on absorption capacity is reviewed in the present report. Starting from simple amines, further change in structure and its effect on absorption capacity of amine is studied. CO2 absorption capacity of each type of amine group, change in chain length, branching of chain, number of amine groups, introduction of functional group –OH and further change in their structure and cyclic amine and their derivatives are compared on the basis of their change in structure. Effect of blends formation is also discussed on CO2 absorption capacity, rate of reaction and heat of absorption.