Abstract
Ionic liquids (ILs) with high CO2 affinity are highly sought after materials for developing high performance membranes for CO2 separation. For the first time, a styrene-based IL (S-IL) monomer was synthesized and coated on the external surface of a styrene butadiene copolymer-derived hollow fiber substrate by UV polymerization to form cross-linked, poly(S-IL) hollow fibers, and developed a defect-free selective layer. The polymerization parameters, including the precursor/initiator molar ratio and reaction time, were systematically investigated to optimize the polymerization conditions, and their effects on the separation performances of CO2 and N2 single gas and their gas mixtures. The CO2/N2 selectivity of the poly(S-IL) hollow fiber membranes increased from 1 to 29 reaching a final CO2 permeance of 3.6 GPU with increasing the precursor/initiator molar ratio and the polymerization reaction time. However, the CO2 permeance of poly(S-IL) hollow fiber membranes was decreased obviously from 6.4 to 2.9 when the initiator was increased from 1 to 2 wt% for polymerization process. Upon increasing testing temperature (30 °C–70 °C) for the binary gas test, the gas permeance increased two folds from 1.8 to 3.5 GPU (CO2) and from 0.07 to 0.17 GPU (N2). The CO2/N2 selectivity of 35 was highest at 50 °C, due to an increased in the polymer chain mobility which promoted gas transport.
Published Version
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call