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- W2061822446 abstract "Two asymmetric polyimide membranes that have a thermal stability up to 550 K and good resistance to solvents were prepared. Some membrane-forming conditions such as coagulation solution, evaporation and immersion time were examined. Regarding the coagulation solution, a water–methanol mixture gives good membranes in eleven solutions tested. The permeabilities of two asymmetric polyimide membranes for CO2 and CH4 pure gases were determined at 25°C and at applied pressures up to 0.25 MPa. The prepared polyimide membranes, 3,3′,4,4′-biphenyltetracarboxylic dianhydride (BPDA)-4,4′-diaminodiphenyl ether (ODA) and 1,2,3,4-butanetetracarboxylic dianhydride (BDA)-4,4′-diaminodiphenyl ether (ODA) exhibited higher selectivity and permeability for CO2/CH4." @default.
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- W2061822446 date "1999-02-01" @default.
- W2061822446 modified "2023-09-26" @default.
- W2061822446 title "Separation of CO2 and CH4 through two types of polyimide membrane" @default.
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- W2061822446 doi "https://doi.org/10.1016/s0040-6090(98)01350-9" @default.
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