気体分離用ポリイミド非対称膜の研究-2-蒸発時間の影響

概要

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The effect of the N-dimethylacetamide (DMA) evaporation period during the casting process on the selectivity and permeability of asymmetric polyimide (PMDA-4, 4'-ODA) membrane was investigated. The separation factor for a gaseous mixture of H2 and N2 with a concentration ratio of 50 : 50 at a operating temperature of 373 °K and a trans membrane pressure difference of 1.2 MPa, was 1.5 at 1-2 minutes and increased to 15 at 3 minutes. It assumed a maximum value of 21 at 4 minutes and decreased again to 1.5 after 5 minutes. With an increase of evaporation periods, the permeability decreased from 1.5×10-9 mol/ (m2·s·Pa) and assumed a minimum value of 7×10-11 mol/ (m2·s·Pa) at 3 minutesand then increased again to 5 × 10-10 mol/ (m22·s·Pa) at 4 minutes and 1.5 × 10-9 mol/ (m2·s·Pa) after 5 minutes. The permeabilities of H2, N2, CH4, Ar, CO2, CH3OH, C2H5OH, H2O, toluene and n-nonane were measured and with the exception of H2, found to be proportional to the boiling point temperatures at atmospheric pressure.
日本膜学会の論文