The equilibrium solubilities of dihydroxybenzene isomers pyrocatechol,
resorcinol and hydroquinone have been measured in supercritical carbo
n dioxide using a simple static method. The measurements were performe
d in the pressure range from 120 to 400 atm at temperatures 35, 45, 55
and 65 degrees C for pyrocatechol and resorcinol and in the pressure
range from 120 to 200 atm at temperature 35 degrees C for hydroquinone
. The solubility of the isomers in supercritical CO, was found to vary
in the order pyrocatechol > resorcinol >> hydroquinone. The experimen
tal data were correlated by use of the density based model proposed by
Chrastil. (C) 1998 Elsevier Science B.V. All rights reserved.