Journal of Thermodynamics

Research Article

Supercritical Phase Equilibria Modeling of Glyceride Mixtures and Carbon Dioxide Using the Group Contribution EoS

GC-EoS pure group and binary interaction parameters used in this work.

(a) Pure group parameters


	Reference temperature	Group surface area	Pure group energy parameters


CH₃	600	0.848	316910	−0.9274	0.0
CH₂	600	0.540	356080	−0.8755	0.0
CH=CH	600	0.867	403590	−0.7631	0.0
CH₂COO	600	1.420	831400	−1.0930	0.0
CH₃COO	600	1.728	831400	−1.0930	0.0
TG^a (triglyceride)	600	3.948	346350	−1.3460	0.0
CH₂OH	512.6	1.124	1207500	−0.6444	0.0
CHOH	512.6	0.908	1207500	−0.6444	0.0
CO₂	304.2	1.261	531890	−0.5780	0.0

(b) Binary group interaction parameters


		Attractive energy parameters		Nonrandomness parameters


CO₂	CH₃	0.898	0.0	4.683	4.683
	CH₂	0.874	0.0	4.683	4.683
	CH=CH	0.948	0.0	0.0	0.0
	CH₂COO	1.115	0.094	−1.615	−1.615
	TG	1.094	0.112	−1.651	−1.651
	CH₂OH/CHOH	0.985	0.0	0.468	−0.390

TG	CH₃/CH₂	0.860	0.0	0.0	0.0
	CH=CH	0.883	0.0	0.0	0.0
	CH₂COO/CH₃COO	1.237	0.0	−8.700	−3.656
	CHOH/CH₂OH^b	1.079	−0.029	−10.53	−11.23

CH₂COO/CH₃COO	CH₃/CH₂	0.869	0.0	0.0	0.0
	CH=CH	1.006	0.0	−0.876	−0.876
	CHOH/CH₂OH^b	0.996	−0.163	0.654	−2.612

CH₂OH/CHOH	CH₃	0.715	0.0	10.220	1.471
	CH₂	0.682	0.0	10.220	1.471
	CH=CH	0.816	0.0	3.862	2.447

^a(CH₃COO)₂CH₂COO.
^bParameters regressed in this work.