High pressure solubility data of carbon dioxide in (tri-iso-butyl(methyl)phosphonium tosylate + water) systems Ventura, S.P.; Pauly, J.; Daridon, J.L.; Lopes da Silva, J.; Marrucho, I.M.; Dias, A.M.; Coutinho, J.A.; The Journal of Chemical Thermodynamics 2008, 40, 1187-1192