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• W1985882429 endingPage "207" @default.
• W1985882429 startingPage "197" @default.
• W1985882429 abstract "Pure and mixed gas permeation experiments for olefins and paraffins of C2 and C3 were carried out for several polyimide and other polymer membranes at pressures up to 8 atm and temperatures from 308 to 423 K. The olefins were more permeable to the corresponding paraffins due to their preferential diffusion based on the difference in their molecular size. Polyimide prepared from 4,4′-(hexafluoroisopropylidene)diphthalic anhydride (6FDA) and 2,4,6-trimethyl-1,3-phenylenediamine (TrMPD) displayed relatively high performance: permeability coefficient to propylene, PC3H6 = 20–40 Barrer (1 Barrer = 1 × 10−10 cm3(STP)/(cm s cmHg)) and ideal separation factor (permeability ratio of pure propylene and propane). αid(C3H6/C3H8) = 11 at 323 K and 2 atm. Polyimide from 6FDA and dimethyl-3,7-diaminodiphenylthiophene-5,5-dioxide (DDBT) displayed low permeability and high permselectivity: PC3H6 = 0.8 Barrer and αid(C3H6/C3H8) = 27 at 323 K and 2 atm. Their performance was much better than that of other polymers such as poly(2,6-dimethyl-1,4-phenyleneoxide). For mixed gas permeation, the separation factor was lower by about 40% than the αid due to the increase in PC3H8 caused by coexisting propylene." @default.
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• W1985882429 date "1996-12-01" @default.
• W1985882429 modified "2023-10-17" @default.
• W1985882429 title "Permeation and separation properties of polyimide membranes to olefins and paraffins" @default.
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• W1985882429 doi "https://doi.org/10.1016/s0376-7388(96)00182-2" @default.
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