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    Analysis of feed stream acid gas concentration effects on the transport properties and separation performance of polymeric membranes for natural gas sweetening: A comparison between a glassy and rubbery polymer

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    Type
    Article
    Authors
    Vaughn, Justin T.
    Koros, William J.
    KAUST Grant Number
    KUS11-011-21
    Date
    2014-09
    Permanent link to this record
    http://hdl.handle.net/10754/597556
    
    Metadata
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    Abstract
    A 6FDA based polyamide-imide, 6F-PAI-1, is compared to Pebax®, a commercially available rubbery polyether/polyamide block copolymer, for the simultaneous separation of CO2 and H2S from CH4. Feed streams of 20/20/60 and 5/45/50H2S/CO2/CH4 were used to compare the effect of acid gas concentration on the separation efficiency of 6F-PAI-1 and Pebax® under industrially relevant conditions. 6F-PAI-1 showed CO2/CH4 selectivities at 850psia total feed pressure of 30 and 40 for the 20/20/60 and 5/45/50 feed streams, respectively, while selectivity for H2S/CH4 was approximately 20 for both feeds. Pebax® showed selectivities of 40 and 10 for H2S/CH4 and CO2/CH4, respectively. Both selectivities were mostly independent of acid gas concentration in the feed, an unsurprising trend considering the non-glassy nature of this material. The selectivities in 6F-PAI-1 translated to less than 6% CH4 lost in the permeate stream for both feeds, while for the 5/45/50 feed, CH4 fraction in the permeate at 850psia was less than 4%. These promising results suggest that glassy polymers possessing favorable intrinsic plasticization resistance, such as 6F-PAI-1, may be appropriate for the typical case of natural gas sweetening where CO2 concentration in the feed is higher than it is for H2S. © 2014 Elsevier B.V.
    Citation
    Vaughn JT, Koros WJ (2014) Analysis of feed stream acid gas concentration effects on the transport properties and separation performance of polymeric membranes for natural gas sweetening: A comparison between a glassy and rubbery polymer. Journal of Membrane Science 465: 107–116. Available: http://dx.doi.org/10.1016/j.memsci.2014.03.029.
    Sponsors
    This publication is based on work supported by Award no. KUS11-011-21, made by King Abdullah University of Science and Technology (KAUST). The authors would also like to thank Dr. Justin Johnson and Dr. (Viz Karvan for design and construction of the H<INF>2</INF>S equipment.
    Publisher
    Elsevier BV
    Journal
    Journal of Membrane Science
    DOI
    10.1016/j.memsci.2014.03.029
    ae974a485f413a2113503eed53cd6c53
    10.1016/j.memsci.2014.03.029
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