Cc. Huang et al., Calculation of the solid solubilities in supercritical carbon dioxide using a modified mixing model, FLU PH EQUI, 179(1-2), 2001, pp. 67-84
The Peng-Robinson equation of state and a modified Huron-Vidal type mixing
model with a volume correction term are applied in this study to calculate
the solid solubilities of aromatic, fatty acid and heavy alcohol compounds
in supercritical carbon dioxide. The UNIFAC activity coefficient model with
its optimally fitted binary interaction parameters is used in this study.
A volume correction term is employed, and its parameters are correlated as
functions of the solid molar volume for both non-polar and polar systems. T
he effect of the sublimation vapor pressure on the calculation of solid sol
ubilities in supercritical carbon dioxide is examined. The sublimation vapo
r pressures for heavy compounds are fitted in this study to yield the optim
ally calculated results of the solid solubility. Reasonable sublimation vap
or pressures are obtained and their values are well correlated by the Antoi
ne equation. A generalized calculation model is proposed in this study whic
h gives satisfactory results of the solid solubility in supercritical carbo
n dioxide for both the binary and ternary systems. (C) 2001 Elsevier Scienc
e B.V. All rights reserved.