Sifting the Ionic Liquid Solvent for Aromatic Extraction Separation and Process Simulation
The separation performance of six different ionic liquids(ILs)in aromatics extraction at the temperature of 303.15 K and a certain solvent to oil ratio were evaluated by liquid-liquid equilibrium experiment.As a result,the optimal ILs extractant l-allyl-3-methylimidazole bis(trifluoromethylsulfonyl)imide([Amim][NTf2])was obtained.The liquid-liquid equilibrium data for ternary mixtures of n-hexane+benzene+[Amim][NTf2]were then systematically determined at 303.15-323.15 K and atmospheric pressure.These data were regressed to obtain the novel binary interaction parameters of NRTL thermodynamic model for the investigated systems.Based on the sulfolane aromatics extraction process,the separation process of benzene extraction with[Amim][NTf2]entrainer instead was designed and simulated,thus obtaining the optimum parameters as below:15 theoretical plates for core unit extraction column,5th plate in the middle reflux feed position,and operating pressure of 100 kPa.The results show that the new heat-integrated process with ILs solvent causes similar energy consumption(20.82 MW)as compared with sulfolane process.Meanwhile,the calculated annual total cost(62.49 × 105 USD/a)is lower for ILs process when without considering the solvent cost.The liquid-liquid equilibrium experimental data and process simulation results can provide a guide for aromatic extraction in practice.
aromatics separationionic liquidsulfolaneliquid-liquid extractionannual total cost calculation
万方数据
维普
