Mixed-Gas Separation Properties of Phosphazene Polymer Membranes

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Abstract
In this paper the mixed-gas separation properties of poly[bis(phenoxy)phosphazene] based polymers are reported. Transport behavior was determined using the variable volume technique. Test gases were run as mixed-gas pairs including SO2/N2, H2S/CH4, and CO2/CH4. Transport of these gases was found to be a sorption controlled process since these gases significantly deviated from the diffusion controlled permeability-size correlation. Membranes were prepared using solution casting techniques. Solvent evaporation rate during the casting and subsequent curing processes was controlled to provide a consistent membrane microstructure. We have observed that polyphosphazene membranes can effectively be used to separate acid gases from various waste streams in harsh, chemically aggressive environments.

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