Phase equilibria in mixtures of fatty oils and derivatives with near critical fluids using the GC-EOS model

Transesterification of leather tanning waste to biodiesel at supercritical condition: Kinetics and thermodynamics studies

“…P c and T c ) of pure fatty oil due to the unavailability of thermophysical data of this substance. For simplification purpose, the mixture of saturated and unsaturated triglycerides in fatty oil was assumed as a single pseudo-triacylglyceride with equal molecular weight and degree of unsaturation of the original oil based on the approach taken in some previous studies [22][23][24]. The critical properties of methanol-fatty oil mixture were estimated by constructing phase diagram using Phase Envelope feature in ChemCAD software (Version 6.2.0, Chemstations Inc.) with Predictive Soave-Redlich-Kwong (PSRK) as the thermodynamic model.…”

High Pressure Phase Equilibrium Engineering

“…The GCA-EoS model has been applied successfully to the design of phase scenarios for the processing of food related products where critical and subcritical conditions of pure components and mixtures have been predicted in agreement with experimental results (Espinosa et al 2002a). Case studies of phase design with applications of the GCA-EoS model are given at the end of this chapter.…”

“…Bottini et al (1999) proposed to obtain the molecule critical diameter from experimental values of infinite dilution activity coefficients of a non polar molecule, like hexane, in a high molecular weight molecule. Later, Espinosa et al (2002a) In this way the critical diameters of homologous families are also obtained by a group contribution approach.…”

“…Several authors have correlated the experimental information using classical cubic equations of state, like SRK and PR-EoS, with good results. Other authors apply group contribution models, like the GC-EoS (Bottini et al 1999;Espinosa et al 2002a). The main advantage of these models is that many different and complex systems can be represented using a limited number of group parameters.…”

Phase equilibria of oleic, palmitic, stearic, linoleic and linolenic acids in supercritical CO2

“…Espinosa et al (2002) utilized group contribution methods and equations of state to determine the phase equilibrium in systems containing fatty acids. Following the same idea, Jaubert et al (2001) compared the experimental results of extraction of EPA and DHA, sterified in supercritical carbon dioxide, with data obtained from group contribution methods.…”