Ester-Cross-linkable Composite Hollow Fiber Membranes for CO2 Removal from Natural Gas
writer：Canghai Ma and William J. Koros
keywords：復(fù)合膜材料
source：期刊
specific source：Ind. Eng. Chem. Res., 2013, 52 (31), pp 10495–10505
Issue time：2013年
High-performance ester-cross-linkable composite hollow fibers were developed through simultaneous spinning of 4,4′-(hexafluoroisopropylidene) diphthalic anhydride (6FDA) based polyimide and Torlon (registered trademark of Solvay Polymers) solutions. The core layer polyamide-imide polymer, Torlon, demonstrates excellent adhesion with cross-linkable 6FDA-based polyimide during spinning and ester-cross-linking. Torlon also shows superior thermal stability after cross-linking while maintaining the open substructure of the Torlon core layer. The resultant cross-linked composite hollow fibers show a CO2 permeance of 40 GPU with a CO2/CH4selectivity of 39 in testing at 100 psi with 50/50 CO2/CH4 feed, 35 °C. The cross-linked composite hollow fibers also show high separation performance in the presence of high-level toluene contaminants up to 1000 ppm, suggesting that cross-linked composite hollow fibers are viable under realistic operation conditions. The high natural gas separation performance and significantly reduced cost of hollow fiber formation provides a significant advancement in the state of the art for natural gas separations.