Separation of N2O and CO2 using Room-Temperature Ionic Liquid [bmim][Ac]

We have developed a ternary equation of state (EOS) model for the N2O/CO2/1-butyl-3-methylimidazolium acetate ([bmim][Ac]) system in order to understand the separation of N2O and CO2 using room-temperature ionic liquids (RTILs). The present model is based on a generic RK (Redlich-Kwong) EOS, with empirical interaction parameters for each binary system. The interaction parameters have been determined using our measured VLE (vapor-liquid-equilibrium) data for N2O/[bmim][Ac] and literature data for CO2/[bmim][Ac] and N2O/CO2. The binary EOS model for the N2O/[bmim][Ac] system correctly predicted the liquid-liquid phase separation found in VLLE experiments. The validity of the ternary EOS model has been checked by conducting VLE experiments for the N2O/CO2/[bmim][Ac] system over a temperature range from 296 to 313 K. With this EOS model, solubility (VLE) behavior has been calculated for various (T, P, and feed compositions) conditions. Over a range of N2O/CO2 feed ratios, the N2O/CO2 gas selectivity [α N 2 O/...