A MODIFIED PENG-ROBINSON EQUATION OF STATE

A modified form of the Peng-Robinson equation of state is proposed. Th is equation shows its greatest advantage in the predictions of the vol umetric properties in the single-phase region for mixtures, while it p erforms as good as original Peng-Robinson equation for the predictions of thermodynamic properties of pure components, and vapor-liquid equi libria of mixtures. Also the equation gives apparently more realistic Joule-Thomson inversion curves than both the SRK and PR equations.