Aqueous piperazine derivatives for CO2 capture: Accurate screening by a wetted wall column

► Liquid mass transfer coefficient and CO2 solubility in highly concentrated and CO2 loaded Piperazine (PZ) derivatives were characterized with a wetted-wall column. ► The liquid mass transfer rate decreases in the sequence of 1-MPZ = PZ > 2-MPZ/PZ > 2-MPZ > HEP > MEA > AEP = 2-PE. ► Cyclic CO2 capacity of the solvents without overstripping decreases in the sequence of 2-PE > 2-MPZ > 2-MPZ/PZ > 1-MPZ > PZ > HEP > AEP > MEA. ► The enthalpy of CO2 absorption of all the piperazine derivatives is around 70 kJ/mol CO2.