Crosslinkable TEGMC asymmetric hollow fiber membranes for aggressive sour gas separations
Permanent link to this recordhttp://hdl.handle.net/10754/629763
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AbstractHollow fiber membranes were prepared from TEGMC (TriEthylene Glycol Monoesterified Crosslinkable) 6FDA-DAM:DABA (3:2) polyimide and shown to retain their stability and permselectivity under aggressive sour gas feed conditions. The H2S/CH4 and CO2/CH4 permselectivities of these cross-linked fibers exceeded those of dense-film membranes, which is attributed to polymer-chain alignment induced during the spinning process. Morover, when the crosslinked fibers were post-treated to deposit a polydimethylsiloxane (PDMS) layer on the skin, high-pressure performance under mixed-gas feeds improved even further. We hypothesize that the PDMS layer healed subtle morphological imperfections in the chain-oriented fiber skin even under challenging feed conditions. The high-performance membranes showed CO2/CH4 and H2S/CH4 permselectivity values as high as 55 and 29, respectively for a 5% H2S, 45% CO2, and 50% CH4 feed at 35 °C. An even more aggressive 20% H2S, 20% CO2, 60% CH4 mixed gas feed with 500 psig feed pressure was also used and showed CO2/CH4 and H2S/CH4 permselectivity values of 47 and 22, respectively.
CitationBabu VP, Kraftschik BE, Koros WJ (2018) Crosslinkable TEGMC asymmetric hollow fiber membranes for aggressive sour gas separations. Journal of Membrane Science 558: 94–105. Available: http://dx.doi.org/10.1016/j.memsci.2018.04.028.
SponsorsThis work was supported by the King Abdullah University of Science and Technology (KAUST).
JournalJournal of Membrane Science