High-Pressure Phase Behavior of Systems with Ionic Liquids: Part V. The Binary System Carbon Dioxide + 1-Butyl-3-methylimidazolium Tetrafluoroborate Kroon, M.C.; Shariati, A.; Costantini, M.; van Spronsen, J.; Witkamp, G.J.; Sheldon, R.A.; Peters, C.J.; Journal of Chemical & Engineering Data 2005, 50, 173-176