Simultaneous correlation of the excess enthalpy and W-shaped excess heat capacity of 1, 4-dioxane- n-alkane systems by PRSV-HVOS CEOS

In this work the Peng-Robinson-Stryjek-Vera (PRSV) equation of state coupled with the Huron-Vidal-Orbey-Sandler (HVOS) rule was tested for the correlation of the ex- cess enthalpy (H E ) and the excess heat capacity (cp E ) alone and simultaneously. The HVOS mixing rule incorporates the NRTL equation as the G E model. All calculations were per- formed using the linear and reciprocal forms of the temperature dependent parameters of the models. For all the evaluations the 1,4-dioxane+n-alkane systems were chosen having in mind the unusually W-shaped concentration dependence of cp E for these systems. The corre- lation of the H E and cp E data alone for all the investigated systems using four coefficients and for the simultaneous correlation of H E +cp E data using six coefficients of the temperature de- pendent parameters of the PRSV-HVOS models could be considered as being very satisfac- tory.