Abstract
Abstract This Paper describes a new method of obtaining an optimum set of coefficients in the original Benedict-Webb-Rubin (BWR) equation using the vapour and liquid densities in the saturated region. A step to further improve its applicability utilizing the high accuracy equations of state for pure substance is also detailed. The eight BWR coefficients are determined using appropriate object functions containing selected deviations of variables such as saturated pressure, liquid density, vapour density and fugacity. BWR coefficients thus obtained are found to broadly reproduce satisfactorily the experimental data of PVT relation in the saturated and superheated region. The accuracy of vapour-liquid equilibria for binary systems have been also verified for more than 500 experimental points. Furthermore, the second virial coefficient, B , is calculated and compared with the values in literature. These results indicate that the original BWR equation can be satisfactorily used in designing industrial plants.
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