ArticleScientific reports2026
Hydrophobic porous polysulfone membrane contactors with gravity-driven Ca(OH)
Article in Scientific reports, 2026. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Not yet cited in PubMed.
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Abstract
The upgrading of biogas to biomethane requires efficient and energy-conservative removal of carbon dioxide (CO₂) to enhance calorific value and downstream usability. In this study, a gravity-driven hydrophobic polysulfone (PSf) hollow-fiber membrane contactor was systematically evaluated for CO₂ removal from a synthetic CH₄/CO₂ (60/40 v/v) gas mixture under ambient conditions (23 ± 1 °C and 1 atm). Unlike conventional membrane contactor systems that rely on mechanically driven liquid circulation, the present configuration operates without liquid pumping, thereby eliminating liquid-phase energy demand and simplifying system architecture. Comparative experiments were conducted using tap water as a physical absorbent and a low-concentration Ca(OH)₂ solution (0.1 wt%) as a reactive absorbent to assess hydrodynamic, mass transfer, and energy performance under realistic decentralized operating conditions. CO₂ removal efficiencies exceeding 90% were achieved for both absorbents at optimized operating conditions (gas flow rate: 122.5 mL min
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