| 초록 |
The sorption equilibrium for CO2 and N2 in dry chitosan membrane at 20 and 30ㅁCwere measured by a pressure decay method. The steady-state permeation rates for CO2 andN2 in dry and wet(swollen with water vapor) chitosan membrane at 20 and 30ㅁC, weremeasured by volume method. The sorption equilibrium for N2 obeyed Henry’s law, whereasthat for CO2 could be interpreted by the interaction of sorbed CO2 with the chitosan matrixexpressed as a reversible reaction. The logarithm of the mean permeability coefficient for CO2in dry chitosan membrane increased linearly with upstream gas pressure. A linear increase ofthe logarithmic mean permeability coefficient for CO2 with the pressure couldbe interpreted interms of a modified free-volume model. The mean permeability coefficient for N2 in drychitosan membrane only slightly increased with upstream gas pressure. The permeabilities forCO2 and N2 in wet chitosan membrane increased by 15 to 17 times and 11 to 15 times,respectably, as compared to those in the dry membrane.
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