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The unique properties of polyvinyl alcohol (PVA) and polysulfone (PSf), such as good membrane-forming ability and adjustable structure, provide a great opportunity for CO 2 -separation membrane development. This work focuses on the fabrication of PVA/PSf composite membranes for CO 2 /N 2 separations. The membranes prepared by coating a 7.5 wt% PVA on top of PSf substrate showed a relatively thin selective layer of 1.7 µm with an enhanced CO 2 /N 2 selectivity of 78, which is a ca. 200% increase compared to the pure PSf membranes. The CO 2 /N 2 selectivity decreases at a rapid rate with the increase of feed pressure from 1.8 to 5 bar, while the CO 2 permeance shows a slight reduction, which is caused by the weakening of coupling transportation between water and CO 2 molecules, as well as membrane compaction at higher pressures. Increasing operating temperature from 22 °C to 50 °C leads to a slight decrease in CO 2 permeance, but a significant reduction in the CO 2 /N 2 selectivity from 78 to 27.1. Moreover, the mass transfer coefficient of gas molecules is expected to increase at a higher velocity, which leads to the increase of CO 2 permeance at higher feed flow rates. It was concluded that the CO 2 separation performance of the prepared membranes was significantly dependent on the membrane operating parameters, and process design and optimization are crucial to bringing CO 2 -separation membranes for industrial applications in post-combustion carbon capture.

Preparation and Characterization of Polyvinylalcohol/Polysulfone Composite Membranes for Enhanced CO2/N2 Separation