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dc.contributor.advisorKoros, William
dc.contributor.authorChu, Yu-Han
dc.date.accessioned2018-08-20T15:31:01Z
dc.date.available2018-08-20T15:31:01Z
dc.date.created2017-08
dc.date.issued2017-07-21
dc.date.submittedAugust 2017
dc.identifier.urihttp://hdl.handle.net/1853/60165
dc.description.abstractIn this work, carbon molecular sieve (CMS) dense film membranes derived from 6FDA-DAM:DABA (3:2) polyimide precursor were studied for separation of mixed olefins (C2H4 and C3H6) from paraffins (C2H6 and C3H8). Olefin-selective CMS membranes with high performance can be made by pyrolysis of metal-containing polymeric precursors. Pyrolyzed at 550°C with a fast ramp rate, CMS membranes with integrated Fe2+ (2.2 wt% in the precursor) showed 19% higher C2H4/C2H6 and 11% higher C3H6/C3H8 sorption selectivity than that of the neat CMS membrane. Additional investigations with a quaternary mixture feed (C2 and C3 hydrocarbons) show that C2H4 permeability above 10 Barrers with C2H4/C2H6 permselectivity near 11 were achieved for the 3.2 wt% Fe loading case. Although Fe incorporation did not appear to promote C3H6/C2H6 permselectivity, Fe is useful to achieve impressive C2 pair olefin/paraffin separation. Deconvolution of the C2H4/C2H6 permselectivity for the more extensively studied 2.2 wt% loading case was also revealing. While both sorption and diffusion selectivity increased due to the Fe incorporation, a larger influence is seen on the diffusion selectivity versus the sorption selectivity. This added diffusion selectivity was dominated by a contribution from an entropic factor with Fe, which is the feature for CMS materials to surpass conventional polymer membranes.
dc.format.mimetypeapplication/pdf
dc.language.isoen_US
dc.publisherGeorgia Institute of Technology
dc.subjectCarbon molecular sieve
dc.subjectOlefin/paraffin separation
dc.subjectTransition metal bearing membrane
dc.titleTransition metal-containing carbon molecular sieve membranes for advanced olefin/paraffin separations
dc.typeDissertation
dc.description.degreePh.D.
dc.contributor.departmentChemical and Biomolecular Engineering
thesis.degree.levelDoctoral
dc.contributor.committeeMemberAgrawal, Pradeep
dc.contributor.committeeMemberJones, Christopher
dc.contributor.committeeMemberBucknall, David
dc.contributor.committeeMemberBrayden, Mark
dc.contributor.committeeMemberXu, Liren
dc.date.updated2018-08-20T15:31:01Z


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