Mixed Matrix Membranes Using SAPO-۳۴/APMDES/PES for Carbon Dioxide/Methane Separation

Among various CO۲-mitigation technologies, membrane-based technology has offered a more energy-efficient and eco-friendly process for CO۲ separation from large emission sources Despite the predominance of polymeric membranes in the CO۲/CH۴ separation, the tradeoff limitation between membrane selectivity and permeability hinders a good separation performance of these membranes Mixed matrix membranes can offer a dramatic improvement to overcome this shortcoming In this study, polyethersulfone (PES) mixed matrix membranes incorporated with small pore zeolite were proposed for CO۲/CH۴ separation SAPO-۳۴ zeolite was used as inorganic fillers to enhance gas selectivity ۳ ۳- aminopropylmethyldiethoxysilane (APMDES) was proposed to modify SAPO-۳۴ zeolite before adding into asymmetric PES MMMs. The mixed matrix membranes were then characterized by FTIR, TGA, SEM, and gas permeation analysis. The separation results revealed that the increment of temperature from ۳۰ °C to ۵۰ °C reduced the CO۲/CH۴ separation factor while increasing feed pressure from ۳ bar to ۱۵ and the increment of CO۲ feed composition from ۱۵ to ۴۲.۵ vol% increased the separation factor of PES/SAPO-۳۴/APMDES. The DoE results showed that the feed pressure was the most significant process parameter that intensely affected the CH۴ permeance, CO۲ permeance, and CO۲/CH۴ separation factor. The synthesized MMMs in this study showed competitive CO۲/CH۴ separation performance compared with reported state-of-the-art PES-based membranes in pure gas permeation tests.

کلیدواژه ها:

mix matrix membrane ، SAPO-۳۴ ، Polyethersulfone ، CO۲ separation