Abstract
AbstractThe CO2and CH4permeabilities of poly(ethylene‐co‐vinyl acetate) (EVA)/SiO2composite membrane were investigated at atmospheric pressure. The membranes were fabricated by compression molding and characterized by Fourier transformed infrared spectroscopy, differential scanning calorimetry, a universal testing machine, and a contact angle analyzer. The effect of vinyl acetate content (18–33 wt%) was evaluated for both single‐gas and mixed‐gas permeation systems. A non‐pressurized homemade‐permeation cell was used for the single‐gas permeation of CO2and CH4, while a tubular membrane was utilized for a continuous separation of CO2/CH4mixture. CO2flux was readily increased (from 0.7 to 2.0 ml/m2.s) with vinyl acetate content (18–33 wt%). The enhanced CO2permeability is attributed to the increase in polarity and also the decrease in crystallinity of the membrane. A satisfied gas separation selectivity (CO2/CH4) of 4.31 could be obtained from tubular membrane with 28 wt% VA content. The incorporation of SiO2as a filler (0.5–2.0 wt%) especially increased the membrane polarity and hence the CO2flux up to 6.0 ml/m2.s. However, the CH4flux was not affected by VA and SiO2contents.
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