Effect of pendent bulky groups on pure- and sour mixed-gas permeation properties of triphenylamine-based polyimides

Unprecedented Sour Mixed-Gas Permeation Properties of Fluorinated Polyazole-Based Membranes

“…FPT-Ph­(OH) is insoluble in chloroform; therefore, DMF is used for its membrane preparation. The poor solubility of FPT-Ph­(NMe 2 ) in all tested solvents could be attributed to the dimethylamino functional group, which tends to increase the interchain interactions making the penetration of solvent molecules difficult and therefore lowering its solubility …”

“…It is important to mention that working with gas mixtures containing H 2 S requires a high level of safety and our facility is very well equipped for this type of testing. The experimental setup illustrated in Figure S1 has been described in detail in our previous publication …”

“…(a) Column chart comparison of sour mixed-gas permeation performance of POz-CF 3 and FPT-Ph­(OH) membranes at 700 psi and 22 ° C. (b) Column chart comparison of sweet and sour mixed-gas permeation performance of POz-CF 3 and FPT-Ph­(OH) membranes at 500 psi and 22 ° C. (c) Sour mixed-gas plot to compare the H 2 S separation ability of prepared polymeric membranes to some reported membranes performances in the literature: CA, 6FDA-DAM, PIM-6FDA–OH, 6FDA-TPA­( t -Bu), TEG-6FDA-DAM:DABA (3:2), 6FDA-Durene/CARDO (1:3), 6FDA-Durene/MDEA (1:3), and 6FDA-6FpDA/6FDA-Durene (4:1) …”

“…The attractive results obtained for FPT-Ph­(OH) membrane were compared in Figure c to some materials tested for their sour mixed-gas separation performance . For better evaluation, the performance of FPT-Ph­(OH) membrane was compared to four of our previously reported polyimide membranes tested under the same conditions (gas mixture composition, pressure and temperature). ,,, The membrane performance was also compared to previously published materials by Koros et al, , and Liu et al, including cellulose acetate, which is a glassy polymer widely used industrially for natural gas separation. The FPT-Ph­(OH) membrane performance was superior to most of the aforementioned membranes, except for that of 6FDA-DAM membrane published recently by Liu et al., where they reported a surprising benefit of the plasticization occurring during high pressure testing of membranes prepared from glassy polymers.…”

“…are limited by their modest performance. Compared to the massive works on CO 2 /CH 4 application, only few studies have aimed at the development of membrane materials for removal of natural sour gas components due to safety concerns and regulations when dealing with the highly toxic H 2 S. − The aforementioned barriers made the literature for H 2 S removal studies extremely stingy and not reflecting the real aggressivity in terms of H 2 S percentage and feed pressure. − …”