Study On Hydrothermal Stability Of Ionic Liquids And Phase Equilibrium With Methanol

The vapor-liquid equilibrium (VLE) of methanol-ionic liquids (IL) was investigated by saturated vapor method and flash method, respectively. Vapor pressure datas of different methanol-IL solutions (IL mass fraction from10%to80%) were measured through saturated vapor method from room temperature to523.15K. The measured datas were well related with Antoine equation which is a function of vapor pressure and temperature. And vapor pressures and activity coefficients were estimated using NRTL model. The NRTL datas were in good accordance with experiment ones for average relative deviation (ARD) was only2.6%from room temperature to473.15K. The flash method was applied for measuring solubility of methanol in1-octyl-3-methylimidazolium tetrafluoroborate ([OMIM][BF4]) and volumetric mass transfer coefficient (k1a) of methanol. The solubility increased with elevated pressure and temperature, and so was volumetric mass transfer coefficient.1-octyl-3-methylimidazolium tetrafluoroborate ([OMIM][BF4]) was also applied for the methanol synthesis process by triphase method as inert liquid phase. CO was chosen as key component and its conversion was measured for4different situations. It turned out that the conversion of CO first increased with elevated temperature then decreased with higher temperature. The maximum conversion of CO was responding to an optimal temperature which was about510.15K. And at opimal temperature, the conversion increased with elevated pressures. And also the conversion of CO seemed higher than regular situation with other insert liquid phases, which revaling promising applications of ILs.