consequently the results in hight solvent regeneration costs further the co2 loading capacity of such alkanolamines is limited to 0.5 mol of co2/mol of amine tertiary alkanolamines which have a low reactivity with respect to co2 contain no hydrogen atom attached to the nitrogen atom as in cas of mea and DEA and thus the carbamation reaction cannot take place instead tertiary amines promote the co2 hydrolysis reaction forming bicarbonates the reaction heat released in bicarbonate formation is lower than that of carbamate formation thus resulting in lower solvent regeneration costs moreover tertiary amines have a high co2 loading capacity of 1 mol of co2/mol of amine