Investigation of temperature effect on CO2/CH4 separation performance of synthesized PEBA-nanofiller membranes

In this study, in order to investigate CO2/CH4 separation in varied temperatures, composite membrane based PEBA polymer and Zeolite 13X and Zeolite NaA as fillers were prepared. Crystallinity, filler dispersion and roughness of membrane surface analyzed by XRD, SEM and AFM, respectively. The permeability test of pure gases of CO2, CH4 and N2 in a range of 15-55 °C and 4-10 bar, were investigated at 5 and 3 levels, respectively. Using the obtained results, the activation energy of permeation was calculated. N2 and CO2 have the highest and the lowest permeation activation energy, respectively. The composite membrane contain zeolite NaA showed better performance. In this membranes, the CO2 permeability for PEBA-13X and PEBA-NaA at 10 bar and 55 °C is 245 barrer and 279 barrer, respectively. Also, the selectivity of CO2/N 2 of PEBA-13X and PEBA-NaA is gained 111 and 120 and for CO2/CH4 obtained 29 and 28, respectively at 10 bar and 15 °C. At constant pressure by increasing the operating temperature, the CO2 permeability increased and the selectivity of CO2/N2 and CO2/CH4 decreased.

کلیدواژه ها:

Composite membrane ، gas separation ، Operational temperature