A modified dieterici equation of state for vapor pressures up to the critical point

Author(s): Ricardo F.Checoni*, Artur Z.Francesconi, Sergio P.Ravagnani

Amodification of the Dieterici equation of state (D-EOS) is proposed: the repulsive term is described by the Guggenheim hard-sphere repulsive term. Further, the temperature dependence of the attractive term is described using an alpha function (Tr,) based on the modified Mathias- Copeman correlation; the temperature dependence of the repulsion term is described using a beta function (Tr,), analog to theMathias-Copeman function. Vapor pressure of industrially important pure compounds was correlated using the modified Dieterici EOS.Agreement between experimental and calculated values is satisfactory.

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