Patent ID: 8883891

Claim:
A method of preparing an ionic liquid-polymer gel membrane for separating a specific gas from a mixture of gases with improved gas permeability, the method comprising: mixing 0.5 to 2 parts by weight of polyvinylidene fluoride-hexafluoropropyl copolymer (PVdF-HFP) serving as a polymer, 1 part by weight of an ionic liquid including imidazolium as a cation and [BF 4 ] as an anion, and 10 parts by weight of propylene carbonate (PC) serving as a solvent to prepare a solution; and performing a convection drying that allows the solvent to be removed at a condition of 100° C. for 10 to 60 hours and a vacuum drying that allows the residual solvent to be removed at a condition of 80° C. for 10 to 60 hours, to remove the solvent from the solution.