Conclusion
Mixed matrix membranes were fabricated using Pebax1074 and zeolite SAPO-34 for gas separation. Permeation of CO2, N2 and CH4 was measured at wide range of operating conditions form 4 to 24 bar and 25 °C to 65 °C. Molecular sieving effect of zeolite led to increment in CO2 and N2 permeation due to lower molecular size of CO2 and N2 compared to zeolite pore size. In contrast, CH4 permeation was reduced and resulted in excellent enhancement in CO2/CH4 separation which moved membrane performance toward Robeson upper bound. CO2/N2 selectivity also was improved and crossed Robeson upper bound for this separation. Permeability of gases improved more slightly after 20 wt% zeolite loading which indicates that MMM preparation with the current method and materials, gives the best results at this zeolite content with almost 70% and 15% improvement in CO2/CH4 and CO2/N2 selectivity, respectively. SAPO-34 addition led to higher solubility coefficients, compared to the neat membrane. The results showed that diffusion selectivity enhanced whereas solubility selectivity did not change remarkably, which is due to molecular sieving effect and contribution of SAPO-34 on separation properties of the prepared membranes. The interesting observations for CO2/CH4 and CO2/N2 selectivities show the possibility of using the fabricated membranes in natural gas sweetening and post-combustion carbon capture. Also, a semi-empirical model was proposed to correlate sorption isotherms with pressure and value of added zeolite and the calculations showed fairly minor error between experimental results and predicted data from model.
บทสรุปMixed matrix membranes were fabricated using Pebax1074 and zeolite SAPO-34 for gas separation. Permeation of CO2, N2 and CH4 was measured at wide range of operating conditions form 4 to 24 bar and 25 °C to 65 °C. Molecular sieving effect of zeolite led to increment in CO2 and N2 permeation due to lower molecular size of CO2 and N2 compared to zeolite pore size. In contrast, CH4 permeation was reduced and resulted in excellent enhancement in CO2/CH4 separation which moved membrane performance toward Robeson upper bound. CO2/N2 selectivity also was improved and crossed Robeson upper bound for this separation. Permeability of gases improved more slightly after 20 wt% zeolite loading which indicates that MMM preparation with the current method and materials, gives the best results at this zeolite content with almost 70% and 15% improvement in CO2/CH4 and CO2/N2 selectivity, respectively. SAPO-34 addition led to higher solubility coefficients, compared to the neat membrane. The results showed that diffusion selectivity enhanced whereas solubility selectivity did not change remarkably, which is due to molecular sieving effect and contribution of SAPO-34 on separation properties of the prepared membranes. The interesting observations for CO2/CH4 and CO2/N2 selectivities show the possibility of using the fabricated membranes in natural gas sweetening and post-combustion carbon capture. Also, a semi-empirical model was proposed to correlate sorption isotherms with pressure and value of added zeolite and the calculations showed fairly minor error between experimental results and predicted data from model.
การแปล กรุณารอสักครู่..
