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Excess enthalpy calculations by means of equations of state

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Abstract

The suitability of existing equations of state for the prediction of heat of mixing data is investigated.

Classical cubic equations of state, such as those of Redlich-Kwong and Peng-Robinson, are compared with the more theoretically based equation developed by Carnaham and Starling. Calculations are reported for exothermic and endothermic systems.

It is shown that equations of state can be used to describe heat of mixing data and that the Carnaham-Starling repulsive term seems to give better results than the other models investigated.

Zusammenfassung

Die Eignung von bekannten Zustandsgleichungen zur Vorhersage von Mischungswärmen wird untersucht. Klassische Zustandsgleichungen 3. Grades, wie die von Redlich-Kwong und Peng-Robinson werden mit der mehr theoretisch fundierten Gleichung von Carnaham und Starling verglichen. Berechnungen werden für exotherme und endotherme Systeme angegeben. Es wird gezeigt, daß die Zustandsgleichungen zur Beschreibung von Mischungswärmen verwendet werden können und das Abstoßungsglied von Carnaham-Starling bessere Resultate als andere untersuchte Modelle ergibt.

Резюме

Исследована примени мость существующих уравнений состояния для определения теплот смешения. Клас сические кубические уравнения состояния, такие как у равнения Редлих-Квонга и Пенг-Р обинсона, сопоставле ны с более теоретически обосно ванным уравнением Кэрнехем а и Стaрлинга. Приведен ы расчеты для эксотермических и эндотермических си стем. Показано, что ура внения состояния могут быть использованы для описания данных п о теплотам смешения и что отталкивающий множи тель КэрнехемаСтaрли нга дает лучшие результа ты по сравнению с друг ими исследованными моде лями.

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Authors and Affiliations

  1. Institute of Applied Chemistry, University of Trieste, Italy

    M. Fermeglia & I. Kikic

Authors
  1. M. Fermeglia
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  2. I. Kikic
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Additional information

The authors thank the CNR: “Progetto finalizzato chimica fine e secondaria” for financial support.

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Fermeglia, M., Kikic, I. Excess enthalpy calculations by means of equations of state. Journal of Thermal Analysis 29, 687–695 (1984). https://doi.org/10.1007/BF01913526

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