Coagulant Permeance (GPUa) Selectivity CO2 CH4 H2 H2/CO2 CO2/N2 Deionized water 21.5 0.54 25 1.16 39.81 Ethanol 62.35 2.05 71 1.14 30.41 Methanol 189.2 8.09 217.5 1.15 23.39 Temperature: 25°C, feed pressure: 10 bar aGPU = 10−6 cm3 (STP) / (cm2 s cmHg)

Table 5: Gas permeance and CO2/CH4 and H2/CO2 selectivities of PDMS/PSf composite membranes (different coagulants).