Abstract
Present paper includes the usage of Ionic Liquids as greener solvents in extractive distillation by substituting conventional solvents. For the separation of minimum boiling methanol-acetonitrile azeotropic system, extractive distillation was carried out in Aspen HYSYS process simulator by using ionic liquids as solvent. Three imidazolium based ionic liquids namely 1-butyl-3-methylimidazolim acetate ([BMIM][OAc]), 1-butyl-3-methylimidazolium chloride ([BMIM][Cl]), 1-butyl-3-methylimidazolium bromide ([BMIM][Br]) used, were added as hypothetical compound in Aspen HYSYS. Flowsheet was simulated using NRTL as the thermodynamic model, giving a purity of 99.9% by mol of methanol in distillate. Optimization of distillation process was done by varying flow rate of ionic liquid, column stages, feed stage location, ionic liquid stage location and reflux ratio. A Total Cost Analysis (TAC) was carried out by using Economic Analyzer in Aspen HYSYS to compare the optimized design. [BMIM][OAc] is found to most suitable according to the energy and cost analysis.
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