Abstract
Effect of lithium chloride (LiCl) concentration as non-solvent additive in the spinning dopes on the structure and CO 2 absorption performance of the polyvinylidene fluoride (PVDF) membranes was investigated. The hollow fiber membranes were prepared via a wet phase-inversion process and characterized in terms of gas permeability, wetting resistance, mass transfer resistance and overall porosity. The morphology study indicated that by increasing LiCl concentration in the spinning dope, the membrane structure changed from the finger-like to the sponge-like. In addition, by increasing LiCl concentration up to 4 wt.% a drastic decrease in the N 2 permeance and a significant increase in the wetting resistance were observed. CO 2 absorption by distilled water was conducted through the gas–liquid membrane contactors. Using LiCl in the spinning dopes, the CO 2 flux of the prepared membranes significantly improved. By introducing 2 wt.% LiCl, the PVDF membrane showed a CO 2 flux of approximately 60% higher than the plain PVDF membrane at the absorbent flow rate of 200 ml/min. It can be concluded that a porous hydrophobic hollow fiber membrane with improved structure can be a productive alternative for CO 2 absorption and separation through gas–liquid membrane contactors.
Published Version
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