Evaluating the Ability of Methyldiethanolamine/Piperazine Microemulsion in CO2 Absorption

Document Type : Original Article


Faculty of Chemical, Petroleum and Gas Engineering, Semnan University. Semnan 35131-19111, Iran.


In this study CO2 absorption into aqueous droplets of N-methyl-diethanolamine (MDEA) in water-in-oil (w/o) and oil-in-water (o/w) emulsions were investigated in batch-stirred reactor at 298 K and different CO2 partial pressure in the range of 0.1-0.5 bar. The effects of the aqueous phase concentration, emulsion type, CO2 partial pressure and the amount of piperazine as a promoter on absorption percentage and loading amount of CO2 (mole of absorbed CO2/mole of amines) were studied. All microemulsion samples were prepared by titration method. The CO2 loading amounts of all experiments were calculated and the results showed that water in oil samples have better absorption performance and higher CO2 loading values. The loading values in samples were improved in both emulsion types with increasing CO2 partial pressure. The results also showed that in water-in-oil samples with different concentrations of piperazine or MDEA, CO2 absorption and loading improves with increasing amine concentration.


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