Preparation of carbon molecular sieve membranes with remarkable CO2/CH4 selectivity for high-pressure natural gas sweetening

• DOI: 10.1016/j.memsci.2020.118529
• Publication Date: 2020-07-29T07:23:27Z
• Authors: Linfeng Lei; Arne Lindbråthen; Xiangping Zhang; Evangelos P. Favvas; Marius Sandru; Magne Hillestad; Xuezhong He
• Keywords: Carbon fibers

Carbon hollow fiber membranes (CHFMs) were fabricated based on cellulose precursors spun from a cellulose/ionic liquid system. By thermal treatment the using preheating process before carbonization, micropores of prepared CHFMs tightened and thus resulting in highly selective carbon molecular sieve (CMS) membranes. increasing drying temperature RT to 140 °C, show substantial shrinkage, which results reduction average pore size derived 6 4.9 Å. Although narrowed micropore causes decrease gas diffusion coefficient, stronger resistance larger molecules, such as CH4, eventually an ultra-high CO2/CH4 ideal selectivity 917 tested at 2 bar for CHFM-140C due simultaneously enhanced sorption selectivity. The was further with 10 mol%CO2/90 mol%CH4 mixed 60 °C feed pressure ranging 50 bar. obtained remarkable separation factor 131 good stability make these great potential candidates CO2 removal high-pressure natural gas.