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- W3135809657 abstract "Polytetrafluoroethylene (PTFE) is considered as a promising material for membrane contactors due to its intrinsic hydrophobicity and excellent chemical stability. In most published works concerning CO2 absorption, PTFE hollow fiber membranes with diameter larger than 1.2 mm even 2.0 mm were applied, which lost the advantage of membrane contactor in high specific surface area and also increased the mass transfer resistance. In this study, biogas purification by membrane contactor was systematically investigated based on the smaller-diameter PTFE hollow fibers (0.9 mm) developed recently in our laboratory. CH4–CO2 (40%) mixture was used as simulated biogas, and deionized water was used as absorbent for all tests. The influence of module configuration, liquid flow pattern, membrane microstructure, and gas-liquid flow velocity on CO2 removal performance were studied in detail. Moreover, the mass transfer resistance and CH4 recovery rate were also discussed. CO2 content in purified biogas could be below 3% by adjusting the operating parameters. CO2 flux and overall mass transfer coefficient (KOV) under experimental conditions ranged from 0.61 × 10−3 to 1.35 × 10−3 mol/(m2. s) and from 1.67 × 10−5 to 6.34 × 10−5 m/s, respectively. Moreover, CO2 removal performance was stable in an operation of 36 h. PTFE hollow fibers with smaller diameter exhibited preeminent CO2 removal efficiency, which proved great application potential in biogas upgrading by membrane contactor." @default.
- W3135809657 created "2021-03-15" @default.
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- W3135809657 date "2021-06-01" @default.
- W3135809657 modified "2023-10-16" @default.
- W3135809657 title "Removal of CO2 from biogas by membrane contactor using PTFE hollow fibers with smaller diameter" @default.
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- W3135809657 doi "https://doi.org/10.1016/j.memsci.2021.119232" @default.
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