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, H 2, CO 2, O 2, and N 2, and a gas mixture of O 2 and N 2 . 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 [ P H 2 = 1016.4 barrer (1 barrer = 10 -10 cm 3 (STP)·cm·cm -2 ·s -1 ·cmHg -1 ), P CO 2 = 710.3 barrer, P O 2 = 187.8 barrer, P N 2 = 13.9 barrer] and the O 2 /N 2 mixture ( P O 2 = 165 barrer, P N 2 = 10.8 barrer). The CMSMs thermostabilized at 460 °C and carbonized at 850 °C presented the highest selectivities for pure gases ( P H 2 / P N 2 = 129.2, P CO 2 / P N 2 = 93.1, P O 2 / P N 2 = 21.9) and O 2 /N 2 mixture ( P O 2 / P N 2 = 23.6).