Natural gas permeation in polyimide membranes |
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| Affiliation: | 1. Department of Chemical Engineering, The University of Texas at Austin, Austin, TX 78712-1062, USA;2. School of Chemical Engineering, Georgia Institute of Technology, Atlanta, GA 30332, USA;1. School of Chemical & Biomolecular Engineering, Georgia Institute of Technology, 311 Ferst Drive, Atlanta, GA 30332-0100, United States;2. Air Liquide, Delaware Research and Technology Center, 200 GBC Drive, Newark, DE 19702, United States;1. State Key Laboratory of Petroleum Resource and Prospecting, China University of Petroleum, Beijing 102249, China;2. College of Geosciences, China University of petroleum, Beijing 102249, China;3. PetroChina Jidong Oilfield Company, Tangshan 063004, China |
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| Abstract: | Polyimide membranes derived from 6FDA-DAM:DABA and 6FDA-6FpDA:DABA copolymers have been used to separate 50/50 CO2/CH4 mixtures and multicomponent synthetic natural gas mixtures at 35 °C and feed pressures up to 55 atm. For 6FDA-DAM:DABA 2:1 membranes the effects of thermal annealing and covalent crosslinking are decoupled with respect to effects on permeabilities and selectivity. Crosslinking at 295 °C with 1,4-butylene glycol and 1,4-cyclohexanedimethanol increases CO2 permeabilities by factors of 4.1 and 2.4, respectively, at 20 atm feed pressure, without a loss in selectivity, relative to crosslinking at 220 °C. Thermal annealing and crosslinking also reduce CO2 plasticization effects. Crosslinking of DABA-containing copolymers, therefore, can produce membranes with tunable transport properties that offer significantly higher performance with better plasticization-resistance than that reported in the literature for the commercial polymers Matrimid® and cellulose acetate for CO2 removal from natural gas mixtures. Separation of complex mixtures containing CO2, CH4, C2H6, C3H8, and C4H10 or toluene results in a significant decrease of the CO2 permeability, but only a moderate decrease in the CO2/CH4 selectivity. |
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