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

Handle URI:
http://hdl.handle.net/10754/597556
Title:
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
Authors:
Vaughn, Justin T.; Koros, William J.
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.
Publisher:
Elsevier BV
Journal:
Journal of Membrane Science
KAUST Grant Number:
KUS11-011-21
Issue Date:
Sep-2014
DOI:
10.1016/j.memsci.2014.03.029
Type:
Article
ISSN:
0376-7388
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.
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Publications Acknowledging KAUST Support

Full metadata record

DC FieldValue Language
dc.contributor.authorVaughn, Justin T.en
dc.contributor.authorKoros, William J.en
dc.date.accessioned2016-02-25T12:41:59Zen
dc.date.available2016-02-25T12:41:59Zen
dc.date.issued2014-09en
dc.identifier.citationVaughn 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.en
dc.identifier.issn0376-7388en
dc.identifier.doi10.1016/j.memsci.2014.03.029en
dc.identifier.urihttp://hdl.handle.net/10754/597556en
dc.description.abstractA 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.en
dc.description.sponsorshipThis 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.en
dc.publisherElsevier BVen
dc.subjectHydrogen sulfideen
dc.subjectMixed gas permeationen
dc.subjectNatural gas purificationen
dc.subjectPolyamide-imidesen
dc.subjectSour gas sweeteningen
dc.titleAnalysis 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 polymeren
dc.typeArticleen
dc.identifier.journalJournal of Membrane Scienceen
dc.contributor.institutionGeorgia Institute of Technology, Atlanta, United Statesen
kaust.grant.numberKUS11-011-21en
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