Thermodynamics Research Center / ThermoML | Journal of Chemical and Engineering Data

ABSTRACT

The solubility of phenylphosphinic acid (PPA) was measured for the first time in supercritical carbon dioxide (SCCO2) at 313, 323 & 333 K with pressure ranging from 10-20 MPa using a dynamic flow technique. The solubility of PPA in neat SCCO2 ranged from 0.1x10-5 to 18x10-5 mol/mole. The influence of co-solvent, methanol on solubility behavior was studied by measuring the solubility of PPA in SCCO2 + methanol medium (1 and 4 mol% methanol) at 313 & 323 K with pressure varying from 10-20 MPa. The highest solubility of PPA in SCCO2+methanol mixture is 29.4x10-4mol/mole at 313 K and 20 MPa with a methanol composition of 4 mol%. The solubilities in neat SCCO2 were correlated using different semi-empirical equations (Mendez-Teja, Chrastil and Bartle) with an average deviation of less than10%. The solubility in the presence of methanol was correlated with four semi-empirical/empirical models (modified Chrastil, modified Mendez-Teja, Garlapati model and Jouyban equation); among these models, Jouyban model resulted in better correlation with an average deviation of 5%.