In this study, microporous polycarbonate membrane was casted by a Robe method and prepared by a phase inversion process using supercritical CO₂ as a anti-solvent. The removal efficiency of PEG increased with time in a phase inversion process, where it was 37, 45, 50, and 52 % in 10, 20, 30, and 60 min, respectively. The obtained membranes have identical pore sizes of 2 ~ 3 μm.