The transport properties of CO2 and CH4 for trimethylsilylated polysulfone membrane |
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Authors: | Hyun-Joon Kim Suk-In Hong |
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Affiliation: | (1) Department of Chemical Engineering, Korea University, 1, 5-ka, Anam-dong, Sungbuk-ku, 136-701 Seoul, Korea |
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Abstract: | The transport properties of CO2 and CH4 for TMSPSf (bisphenol A trimethylsilylated polysulfone) were measured, and compared with the values for PSf (bisphenol A
polysulfone) and MPSf (bisphenol A methylated polysulfone) to explain the effect of molecular structure of polysulfones on
gas transport properties. The permeability coefficients of three polysulfones rank in the order: TMSPSf>PSf>MPSf. TMSPSf is
several times more permeable than PSf. The effect of the substituents on chain packing was related to the gas transport properties.
The ranking of permeability coefficient correlates well with fractional free volume. The variation of d-spacing is also reasonably
consistent with the permeability coefficient. The effects of pressure on the sorption and permeation properties of polysulfones
were examined. The permeation properties for a mixture of CO2 and CH4 were also measured and these results were compared with the values of pure gases. The sorbed concentrations and permeability
coefficients are well fitted to dual mode model. The permeability coefficients of each gas of binary mixture are reduced than
those for pure gases, and the extent of reduction in permeability coefficient is the smallest for TMSPSf, which has the highest
value of Langmuir capacity constant. |
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Keywords: | Trimethylsilylated Polysulfone Sorption Permeation Mixed Gas |
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