Abstract
Membranes that are resistant to heavy hydrocarbons are of particular interest in natural gas sweetening, the removal of acidic gases such as CO2 from methane. The perfluorinated polymers Teflon AF1600 and Hyflon AD60 are studied here for this purpose because of their unusual solvent resistant properties. The sorption of hexane and toluene vapor in both perfluorinated polymers was observed to follow standard dual-mode sorption behavior at activities less than 0.8, while multilayer absorption was observed for unity activity. However, the corresponding Henry’s law constants for both hydrocarbons were reduced compared to other classes of glassy polymeric membranes. This was attributed to the solvent resistant properties of the perfluorinated polymers. Under mixed gas conditions, it was observed that the CO2 permeability for both perfluorinated polymers was reduced compared to the single gas permeability, attributed to competitive sorption from CH4. However, CH4 permeability increased slightly for both membranes under mixed gas conditions. Adding hydrocarbon vapors to the mixed gas feed resulted in only small changes to the CO2 and CH4 permeability through both perfluorinated polymers, indicating both perfluorinated polymers have potential as hydrocarbon-resistant membranes in natural gas sweetening.
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