Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
633030 | Journal of Membrane Science | 2015 | 10 Pages |
Abstract
Thermally rearranged polybenzoxazole (TR-PBO) hollow fiber membranes were fabricated from a poly(amic acid) (HPAAc) precursor through a non-solvent induced phase separation technique (NIPS). All the major fabrication conditions (e.g. dope composition, the use of additional inorganic salt, dope and bore flow rates, and coagulation bath temperature) were systematically evaluated and optimized, in order to produce defect-free hollow fiber membranes with an ultra-thin skin layer. The hollow fiber membranes fabricated with the optimized spinning conditions exhibited superior pure gas permeation behavior (CO2 permeance of 2500Â GPU and CO2/N2 ideal selectivity of 16). Slow beam positron annihilation lifetime spectroscopy (slow beam PALs) measurements revealed that such an exceptional separation performance was mainly attributed to the ideal cavity radius (3.584Â Ã
) and ultra-thin skin layer thickness (193Â nm) obtained using the optimal fabrication conditions. In addition, mixed-gas permeation tests were also performed to demonstrate the feasibility of using such membranes for post-combustion CO2 capture.
Related Topics
Physical Sciences and Engineering
Chemical Engineering
Filtration and Separation
Authors
Kyung Taek Woo, Jongmyeong Lee, Guangxi Dong, Ju Sung Kim, Yu Seong Do, Wei-Song Hung, Kueir-Rarn Lee, Giuseppe Barbieri, Enrico Drioli, Young Moo Lee,