Rapid evaluation method for oil-gas separation membrane utilizing mass spectrometry

• First application of MIMS for evaluating membrane permeation in insulating oil. • Comparative experiments were conducted for four distinct membranes in the oil. • Partial influencing factors on PT610 membrane permeation flux were evaluated. A rapid evaluation method for the permeation performance of oil-gas separation membrane was proposed, utilizing membrane inlet mass spectrometry technology to simultaneously measure the permeation flux of various dissolved gases. This method enables the rapid measurement of membrane permeability coefficient, selectivity and particularly, membrane response time. Permeation performance comparisons were conducted for perfluoro-2,2-dimethyl-1,3-dioxolane-tetrafluoroethylene copolymer (AF2400), fluorinated ethylene propylene (FEP), polydimethylsiloxane (PDMS) and perfluoro-2-dimethyl-5,5-dimethyl-1,3-dioxolane-tetrafluoroethylene copolymer (PT610) membranes, and the effects of oil feeding rate and concentration on PT610 membrane permeation flux were investigated. The results indicated that the selectivity and permeability of different membranes varied. PT610 and AF2400 membrane exhibited high permeability to the main air components, including CH 4 , H 2 O, N 2 , O 2 , Ar and CO 2 . PDMS membrane showed high permeability only to CH 4 and H 2 O, while FEP membrane demonstrated relatively low permeability across all gases. Additionally, different membranes displayed varying response time to the same substance, and the response time for the same membrane varied slightly for different substances. Specifically, PDMS and AF2400 membrane response time of approximately 2 and 3 min, respectively, while PT610 membrane response time was around 1 min, and FEP membrane showed no response. Compared to traditional method based on osmotic equilibrium time, the proposed method reduces the measurement time significantly.