Abstract
The crossover region is a phenomenological observation which may be used to synthesize supercritical fluid extraction process (SCFEP) and is supported by a number of experimental studies. This phenomenon means that there may be regions of temperature and pressure in the near critical fluid state where the solute solubility decreases with an isobaric increase in temperature. Accurate calculation of solid solubility in supercritical fluid does not imply that crossover pressure calculation has also good accuracy. In this paper, a new method to predict crossover pressure based on cubic equations of state is developed and applied to systems containing supercritical CO2 and bixin. Peng-Robinson-LCVM-UNIFAC equation of state is used in a predictive way and crossover pressure is determined for several conditions. The method described here can in principle be applied to any solid-fluid system used in supercritical fluid extraction process synthesis.
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