Abstract
Membrane-cryogenic hybrid process has been considered as a potential alternative for standalone CO2 separation. In hybrid process, CO2 from flue gas could be initially concentrated via membrane, and then high concentration CO2 stream is cryogenic-separated via phase change in low energy consumption. However, the sub-ambient separation performance and mechanism of membrane has been less investigated. In this work, Pebax 1657/MIL-101 and Pebax 1657/NH2-MIL-101 mixed matrix membranes have been fabricated and tested at sub-ambient condition. SEM, FITR and XRD results indicated that –NH2 has been successfully grafted to MIL101. Experimental results indicated that operating Pebax/MIL-101 and Pebax/NH2-MIL-101 at sub-ambient temperature (−20 °C) could enhance CO2 selectivity to 89.4 and 95.6, which increased by 96.5% and 145.1% compared with that at ambient condition. It indicated that Pebax 1657/NH2-MIL-101 has the potential to be used as sub-ambient membrane in membrane-cryogenic hybrid CO2 capture processes.
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