(53s) Progression of Volume-Shift Concepts As Unreliable Remedy for Predicting Accurate Liquid Volumes from the Van Der Waals Cubic Equations State

The evolution of volume-shift (or volume-translation) concepts which began from Redlich and his students in 1963 with continued growth by Martin (1967) and Peneloux et al. (1972) has reached a point of diminishing returns as a methodology for correcting inaccurate liquid properties predictions from the Van der Waals (VDW) cubic equations of state. As volume-shift theories do not address any fundamental changes to the configuration scheme of the pertinent VDW cubic equations of state, the resulting volume-shift molar volumes should be viewed as after-the-fact remedial actions with varying degrees of opinionated choices.  The correct way of achieving the prediction of accurate coexistence gas-liquid densities and single-phase volumetric and liquid density from any of the VDW cubic equations of state is typified by the design of the Lawal-Lake-Silberberg (LLS) generic cubic equation of state. Some few examples of accurate liquids properties compared to experimental data are used to illustrate the methodology of achieving accurate liquid properties from the VDW theory of cubic equations of state.