| 초록 |
Membrane technology can be used in O2 and N2 generation with low energy consumption. Polyethersulfone (PES) having a high glass transition temperature of 230℃ was reported to have high O2/N2 selectivity of 6.0. In this study, PES was used as a membrane material and 1-methyl-2-pyrollidone (NMP) and acetone were employed as a good solvent and non-solvent addictive (swelling agent to PES), respectively. Dope solutions were prepared by changing the content of acetone (0, 6.5, 15, 25, 31.5 wt%) in 37 wt% PES solutions. Hollow fiber spinning was performed at 0-10cm of air-gap distances for each dope solution. O2/N2 selectivity and permeability were investigated by comparing of hollow fibers coated or not by silicon. O2/N2 selectivity increased and permeabilities of O2 and N2 decreased with increasing air-gap height due to acetone additions. Optimized PES hollow fibers were obtained with 37/6.5/56.5 wt% PES/acetone/NMP dope solution and 10 cm air gap, which showed 7.3 of O2/N2 selectivity and 4.8 GPU of O2 permeability after silicon coating. |
