CO2 absorption capacity using aqueous potassium carbonate with 2-methylpiperazine and piperazine

Various amines as a promoter have been added to the K₂CO₃ solution in order to improve the performance of the CO₂ absorption process. Piperazine (PZ) and 2-methylpiperazine (2-MPZ), cyclic diamines were used as promoters in this study. The equilibrium partial pressure of CO₂ $(P_{{\text{CO}}_2}^1)$ and pressure changes were measured at 313, 333 and 353 K condition of flue gas using VLE (vapor–liquid equilibrium) equipment. The results show that 2-MPZ possesses the ability to promote CO₂ absorption capacity. The K₂CO₃/2-MPZ solution had an equilibrium partial pressure of CO₂ that was lower than that of the MEA solution at 333 K.