GEOS

This is an EOS of the “generalized cubics” category like the Trebble–Bishnoi–Salim equation. In comparison to simpler EOS, it has 2 additional parameters for the density dependence of the attraction term, and 1 parameter for its temperature dependence. Fo the latter, a correlation with the acentric factor exists.

The EOS gives good vapour pressure curves and liquid-density data for many compounds. The critical compression factor is adjustable.

adjustable parameters: 5

For mixture calculations the following mixing theories are available:

- 1FGF: the authors' original mixing theory, which is a Soave-style 1-fluid mixing theory [1]

[1] D. Geană and V. Feroiu, “Ecuaţii de stare”, Editura Tehnica, Bucarest, 2000.

[2] C. Bogatu, A. Duţa, Th. W. de Loos, and D. Geană, *Fluid Phase
Equilib.* (2016), in press.

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