화학공학소재연구정보센터
Journal of Chemical and Engineering Data, Vol.65, No.4, 1705-1714, 2020
Separation of the Dimethyl Carbonate plus Ethanol Mixture Using Imidazolium-Based Ionic Liquids as Entrainers
The mixture of dimethyl carbonate (DMC) and ethanol is a common binary azeotrope system in industry that cannot be effectively separated by conventional separation methods. Two ionic liquids (ILs), namely, 1-butyl-3-methylimidazolium dibutylphosphate ([BMIM][DBP]) and 1-butyl-3-methylimidazolium acetate ([BMIM][AcD, were tried as novel entrainers for the separation of the DMC-ethanol azeotrope. The vapor-liquid equilibrium (VLE) data of the DMC-ethanol binary system and the DMC-ethanol-ILs ternary system at atmospheric pressure were determined. The results showed that both ILs could increase the relative volatility of DMC to ethanol, thus completely breaking the azeotrope at a certain concentration, and [BMIM] [Ad had more excellent separation capacity than [BMINI] [DBP]. The NRTL model and the UNIFAC-Lei model were used to correlate the experimental VLE data, and the fitting results indicated that the NRTL model was in good agreement with the experimental data.