(State Key Laboratory of Chemical Engineering (Tianjin University), School of Chemical Engineering and Technology, Tianjin University, Tianjin 300072, China)
Abstract Vapor-liquid equilibrium (VLE) data for methanol-methyl acetate-1-butyl-3-methylimidazolium bis［(trifluoromethyl)sulfonyl］ imide (［BMIM］［Tf2N］) at 101.3 kPa were measured. The experimental VLE data were correlated by nonrandom two liquid (NRTL) activity coefficient model, and the binary parameters were obtained. The results show that the ionic liquid ［BMIM］［Tf2N］ produces a notable salting-out effect, which enhances the relative volatility of methanol to methyl acetate, and relative volatility of methanol to methyl acetate increase with the concentration of ［BMIM］［Tf2N］ in the system. The effects of ［BMIM］［Tf2N］ and 1-octyl-3-methylimidazolium hexaflurophosphate (［OMIM］［PF6］) were compared, and the results indicated that ［BMIM］［Tf2N］ was more effective for the separation of methanol-methyl acetate system.
2013, Vol. 30 
