Effects of thermal crosslinking treatment on gas separation performance and stability of polymeric membranes

0431121 - ÚFCH JH 2015 RIV CZ eng C - Conference Paper (international conference)
Martin-Gil, V. - Hrabánek, Pavel - Sysel, P. - Fíla, V.
Effects of thermal crosslinking treatment on gas separation performance and stability of polymeric membranes.
CHISA 2014 and PRES 2014 CD-ROM of Full Texts. Prague: Czech Society of Chemical Engineering, 2014, 0630. ISBN 978-80-02-02555-9.
[International Congress of Chemical and Process Engineering CHISA 2014 /21./ and Conference PRES 2014 /17./. Praha (CZ), 23.08.2014-27.08.2014]
Institutional support: RVO:61388955
Keywords : dense membrane * gas separation * polyimide
Subject RIV: CF - Physical ; Theoretical Chemistry

In this work, (4,4’-Hexafluoroisopropylidene) diphthalic anhydride (6FDA), 2,4,6- trimethyl-1,3-diaminobenzene (DAM) and 3,5-diaminobenzoic acid (DABA) were used to synthesize copolyimides with different ratios of DAM:DABA (2:1 and 9:1) as well as polyimide 6FDA-DAM in order to check the influence of acidic group from DABA in the membrane formation process as well as in the crosslinking treatment. The main aim of crosslinking treatment is to improve the CO 2 induced plasticization resistance of the membrane. Copolyimides were synthesized using two steps reaction: (i) synthesis of polyamic acid (PAA) and (ii) thermal imidization in solution. The obtained crosslinked membranes presented solvent resistance due to the transesterification of the polymer. Furthermore, it could be observed that the crosslinked membranes showed higher permeabilities for small gases (He and H 2 ) and for bigger gases (CO 2 and CH 4 ) permeabilities decreased slightly. It can be due to the densification of the membrane during the thermal treatment. However, this treatment presents highly promising results for H 2 recovery in syngas production or extraction of hydrogen from petroleum naphtha cracking streams
Permanent Link: http://hdl.handle.net/11104/0235745