High-Performance Polybenzimidazole Membranes for Helium Extraction from Natural Gas.

ACS Appl Mater Interfaces · 2019 · PMC6556872 · PMID 31094508

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quite significantno p-value reported

22 , 24 , 25 Even perfluoropolymers could achieve higher permeation flux with moderate selectivity, the CO 2 permeability is normally quite significant ( Table S4 ) and therefore becomes an issue in the presence of CO 2 in NG. 3 The high selectivity of He over CO 2 and CH 4 renders the PBDI membrane process more competitive for He extraction, especially from crude NG with low helium abundance and CO 2 presence.

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