Prepapation And Gas Sepapation Performance Of Ionic Liquid Supported Liquid Membrane

With the rapid development of industrialization and sustained growth of energy consumption, coal and petroleum-based energy emissions induce the environmental pollution through large amounts of carbon dioxide, sulfur dioxide, nitrogen oxides and the other. Gas separation and purification is an important way to control air pollution.Membrane separation technology has the advantages of high efficiency, energy saving, environmental protection. The separation process that is based on selective membrane materials to realize the separation and purification of different components is widely used in chemical, metallurgy, energy and other areas. Especially in recent years, the successive production of gas separation membrane and pervaporation membrane opens up a new way for gas separation technology.In this paper, the ionic liquid supported liquid membrane for the separation of gas was studied. PVDF and PSF were used as basic membrane to prepare polymer microporous membrane by the method of non solvent induced the phase separation. The ionic liquids including [BMIM][CH3CH2COO], [BMIM][CH3COO], [BMIM]-[SCN], [BMIM][CF3COO], [BMIM][CH3C6H4SO3] were prepared and then the optimal configuration and minimum binding energy of the coordination compounds formed by the prepared ionic liquids and gas were obtained by molecular simulation calculation to predict the gas selectivity of ionic liquids on the micro scale. Under the specific pressure and at different temperature, N2、H2、CO2 permeation rate through the supported liquid membrane was measured and separation efficiency of the supported liquid membrane for CO2/N2、CO2/H2、N2/H2 was determined.Experimental results show that: the permeability coefficient of PVDF-ionic liquid supported liquid membrane is maintained in the 10-10[m3(STP) ·m/m2·s·atm] number levels. the theory separation factor of PVDF-[BMIM][CH3C6H4SO3] membrane for CO2/N2 reaches its highest to 10.86 at 30 ℃and that for CO2/H2 to 7.12. It seems that low temperature environment is conducive to gas separation of PVDF-ionic liquid supported liquid membrane. the permeability coefficient of PSFionic liquid supported liquid membrane is maintained in the 10-9[m3(STP)·m/m2·s·atm] number level, and the theory separation factor of PSF-[BMIM][C3H8O2] membrane for N2/CO2 reaches its highest to 4.17 at 50℃.