Carbon molecular sieve (CMS) membranes are a special class of nanoporous membranes with angstrom level molecular discrimination properties that make them appealing for separating a wide spectrum of gas-pairs. The mechanism of pyrolysis by which a polymer coil is transformed into these rigid sieves is complex; however, representative polymer precursors and pyrolysis conditions and resultant properties of the CMS membranes provide insights into key phenomena and processes at play in forming such membranes. Control of penetrant motions in the diffusion activated state, which is virtually absent even in rigid state-of-the-art polymeric membranes, makes CMS materials extraordinarily attractive. Another advantage possessed by CMS materials is that, unlike other rigid sieving materials, CMS offer the added advantage of being processable into highly productive, flexible hollow fibers with good mechanical properties and long-term stability under constant gas feeds. This paper will provide an update on the state of the art on this exciting type of membranes.

Carbon molecular sieve membranes - change agents for demanding gas separations

2019 Spring National Meeting

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