Long-term performance of highly selective carbon hollow fiber membranes for biogas upgrading in the presence of H2S and water vapor

• DOI: 10.1016/j.cej.2022.137615
• Publication Date: 2022-06-18T15:30:33Z
• Authors: Adele Brunetti; Linfeng Lei; Elisa Avruscio; Dionysis S. Karousos; Arne Lindbråthen; Evangelos P. Kouv...; Xuezhong He; Evangelos P. Favvas; Giuseppe Barbieri
• Keywords: Biogas; Cellulose triacetate; Barrer

Biogas is an increasingly attractive renewable resource that needs to be upgraded meet either the natural gas pipeline quality or biomethane requirement. The use of carbon membranes a promising alternative conventional separation technologies, but, up now, few attempts have been made systematically investigate their performance under real biogas upgrading conditions, for instance, presence water vapor and H2S in feed stream. In this work, first time literature, performances as-prepared cellulose-based hollow fiber were monitored 183 days continuous exposure stream also containing and/or vapor. After evaluation CO2 CH4 sorption (2,98 mmol g−1 2,00 g−1, respectively at 298 K 10 bar), diffusion(2.45 × 10-7 cm2 s−1 CO2), permeation properties (120.9 2.3 barrer, 308 K) with single gases, long-term tests carried out by feeding mixtures typical composition. It was found (up 500 ppm) (relative humidity 90%) provoked reduction permeability compared "clean dry" mixed gas, which resulted increment selectivity, reached value more than 200. Overall, after 180 testing, exhibited remarkable CO2/CH4 selectivity endurability vapor, confirming fact being good candidates upgrading.