Eduard Hála

Vapor-liquid equilibria of strong electrolytes in systems containing mixed solvent

Abstract A thermodynamically consistent method has been developed for the quantitative characterization of vapor-liquid equilibria in systems with electrolytic components and mixed non-electrolytic solvent. The advantage of the proposed procedure is the prediction of behaviour of ternary systems from binary data. Further, it is possible to use tabulated constants of different correlation equations summarized in different Data Book Collections. The application of the method is illustrated by a typical example.

A generalized method for calculation and prediction of vapour-liquid equilibria at high pressures

A generalized method for prediction of vapour-liquid equilibria in hydrocarbon mixtures containing some nonhydrocarbon gases at high pressures has been developed following the approach of Chao and Seader (1961) and Lee et al. (1973). The method proposed is based on three equations: (1) a generalized equation of state for vapour phase calculations, (2) a generalized expression for the pure liquid fugacity coefficient suggested by Lee et al. (1973), and (3) an activity coefficient expression based on a surface modification of the regular solution model. The equations used contain only one partially generalized binary parameter, which has been evaluated from experimental K-value data. The method proposed has been tested by computing K-values and pressures in binary and multicomponent systems consisting of 13 hydrocarbons and three nonhydrocarbon gases. The results have shown that the proposed method can be applied over a wide range of conditions with a good degree of accuracy, which is comparable with that of more complicated methods.

Current Trents in research and development

Abstract The most important problems of the future for fluid properties anf phase equilibria involve trends in research and development and impacts of external forces in a climate of rapid changes. Some of these changes are evolutionary, treating the future as an orderly continuation and extrapolation of thr present, while others are revo- lutionary, without precendent or predictability. trends in research abd development will be discussed briefly by panel I. Panel II will respond with comments and questions. Then Panel II will follow with prepared remarks on the influence of external forces and panel II will respond. Finally the discussioon will be opened to audience questions and comments. The prepared remarks of Panel I members follew.