Solute influence on the high-pressure phase equilibrium of ternary systems with carbon dioxide and an ionic liquid

To study the potential of performing hydrogenation reactions in ionic liquid–CO2 media, the high-pressure phase equilibrium of the ternary system 1-butyl-3-methylimidazolium tetrafluoroborate (bmim[BF4]) + 4-isobutylacetophenone + carbon dioxide (CO2) has been investigated. Experiments were performed in the Cailletet apparatus in a temperature range from 278.15 up to 368.15 K while pressures up to 14 MPa were applied. In this system, not only liquid–vapor boundaries were found, but also at high CO2 concentrations liquid–liquid biphasic equilibrium occurred.11Additional experiments are in progress. These results will be presented in a subsequent contribution. parison between the experimental results of this work, the data collected for the binary system bmim[BF4] + CO2 and a ternary system with acetophenone as the solute shows that the type of solute added can dramatically change the phase behavior of the system.