Gas Permeation Properties of Carbon Molecular Sieve Membranes Derived from Novel Poly(phthalazinone ether sulfone ketone)

Carbon molecular sieve membranes (CMSMs) were prepared from a novel polymeric precursor of poly(phthalazinone ether sulfone ketone) by thermostabilization in air at 400−500 °C and carbonization at 650−850 °C. Gas permeation properties of the resultant CMSMs were investigated with four pure gases, H2, CO2, O2, and N2, and a gas mixture of O2 and N2. The obtained CMSMs exhibited excellent gas separation performance. The temperatures of thermostabilization and carbonization had a large effect on the gas permeability and selectivity of the CMSMs. The CMSMs thermostabilized at 460 °C and carbonized at 650 °C showed the highest permeabilities for pure gases [PH2 = 1016.4 barrer (1 barrer = 10-10 cm3 (STP)·cm·cm-2·s-1·cmHg-1), PCO2 = 710.3 barrer, PO2 = 187.8 barrer, PN2 = 13.9 barrer] and the O2/N2 mixture (PO2 = 165 barrer, PN2 = 10.8 barrer). The CMSMs thermostabilized at 460 °C and carbonized at 850 °C presented the highest selectivities for pure gases (PH2/PN2 = 129.2, PCO2/PN2 = 93.1, PO2/PN2 = 21.9) and O2/N2 mixture (PO2/PN2 = 23.6).