Performance of natural gas membranes in the presence of heavy hydrocarbons

Pure- and mixed-gas permeation properties of highly selective and plasticization resistant hydroxyl-diamine-based 6FDA polyimides for CO2/CH4 separation

“…In summary, our study provides further evidence of previous work [31,50] that polyimides with strong polar OH groups can mitigate plasticization when tested under high-pressure binary CO 2 /CH 4 mixed-gas conditions due to strong chain interactions by interchain hydrogen bonding and CTC formation. Further work, however, is required to evaluate the mixed-gas permeation properties of hydroxyl-functionalized polyimides with multi-component feeds including condensable C 3+ hydrocarbons to fully demonstrate their potential in industrial natural gas sweetening [51].…”

Antiplasticization and plasticization of Matrimid® asymmetric hollow fiber membranes. Part B. Modeling

“…As for the binary system, Visser et al [5] have shown that the mass transport in membrane for CO 2 /CH 4 mixtures is determined by competitive sorption and plasticization. However, for cases involving condensable aromatic and heavier aliphatic contaminants, current high selectivity membranes face challenges [6][7][8][9][10][11]. Pereira and Admassu [12] showed that the presence of oil reduced single gas (CO 2 and CH 4 ) permeabilities due to the antiplasticization effect.…”

Defect-free asymmetric hollow fiber membranes from Torlon®, a polyamide–imide polymer, for high-pressure CO2 separations

“…20% reduction could be due to any of these three effects: swelling phenomena, competitive sorption [39] (differences in sorption of CO 2 and CH 4 at different pressures) or bulk flow [40]. Decoupling these effects would need further experimentation [41,42] and will be addressed in our future publications by determining the sorption isotherms of CO 2 and CH 4 on a freshly cast and on a scCO 2 exposed Torlon ® membranes. In any case, in our work here, selectivities during depressurization almost followed the same trend as that of pressurization, indicating that the swelling has minimal effect on the membrane separation performance.…”