Measurement of Bubble Points of CO2 in Ionic Liquids, [BMP][Tfo]and [P14,6,6,6][Tf2N] Using Variable-Volume View Cell

The bubble point pressure of carbon dioxide (CO2) and ionic liquids mixture were measured by using a high-pressure experimental apparatus equipped with a variable-volume view cell, at various CO2 compositions in the temperature range from 303.15 to 373.15 K and the pressure range up to about 70 MPa. We selected ionic liquids, 1-butyl-1-methylpyrrolidinium trifluoromethanesulfonate ([BMP][TfO]) and trihexyltetradecyl- phosphonium bis(tri-fluoromethylsulfonyl)imide ([P14,6,6,6] [Tf2N]) for experimental measurement in this study. The modified Lydersen-Joback-Reid method and Peng-Robinson Equation of state have been applied to correlate the experimental data. The experimentally measured bubble point data gave relatively good agreement with those calculated data.