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 excess enthalpy (HE) and the excess heat capacity (cp E) alone and simultaneously. The HVOS mixing rule incorporates the NRTL equation as the GE model. All calculations were performed 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 correlation of the HE and cp E data alone for all the investigated systems using four coefficients and for the simultaneous correlation of HE+cp E data using six coefficients of the temperature dependent parameters of the PRSV-HVOS models could be considered as being very satisfactory.

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Application of the MvdW1 and HVOS-NRTL mixing rules to the simultaneous correlation of excess enthalpies and W-shaped excess heat capacities data of 1,3-dioxolane + n-alkane systems

Journal of the Serbian Chemical Society ◽

10.2298/jsc9912801d ◽

1999 ◽

Vol 64 (12) ◽

pp. 801-811 ◽

Cited By ~ 1

Author(s):

Bojan Djordjevic ◽

Mirjana Kijevcanin ◽

Aleksandar Tasic ◽

Slobodan Serbanovic

Keyword(s):

Excess Enthalpy ◽

Excess Heat Capacity ◽

Fluid Mixing ◽

Mixing Rules ◽

Mixing Rule ◽

Excess Enthalpies ◽

Temperature Dependent ◽

Excess Heat ◽

Nrtl Equation ◽

Two Parameter

The Peng-Robinson-Stryjek-Vera (PRSV) equation of state (EOS) coupled with a modified two parameter van der Waals one-fluid mixing rule (MvdW1) and the Huron-Vidal-Orbey-Sandler mixing rule incorporating the NRTL equation as a GE model was used for the correlation of excess enthalpy (HE), excess heat capacity (CpE) and the simultaneous correlation of both properties. All calculations with temperature dependent parameters of EOS models were applied to 1,3-dioxolane+n-alkane systems. The correlation of the H E and Cp E data alone with four coefficients and the HE+CpE data with six coefficients of the temperature dependent parameters of the HVOS-NRTL models could be considered as very satisfactory.

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On Temperature Dependence of Excess Gibbs Energy

Collection of Czechoslovak Chemical Communications ◽

10.1135/cccc19991093 ◽

1999 ◽

Vol 64 (7) ◽

pp. 1093-1099 ◽

Cited By ~ 2

Author(s):

Ivona Malijevská ◽

Anatol Malijevský

Keyword(s):

Heat Capacity ◽

Gibbs Energy ◽

Temperature Dependence ◽

Excess Gibbs Energy ◽

Excess Enthalpy ◽

Excess Heat Capacity ◽

Wilson Equation ◽

Excess Heat ◽

Energy Excess ◽

Wilson And Nrtl Equations

Temperature dependence of GE is discussed for three widely used equations linear and nonlinear in parameters. It is shown that the Wilson equation predicts always positive excess heat capacity regardless of values of its parameters. Several temperature modifications of the Redlich-Kister, Wilson and NRTL equations are discussed with respect to the sign of the excess Gibbs energy, excess enthalpy and excess heat capacity.

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