HSE (Hard Sphere Expansion) Conformal Solution Theory Using Variational Methods

摘要

This report was written to develop theoretically and demonstrate practically a new procedure for computer calculation of thermodynamic properties of liquid and vapor mixtures along with their equilibrium K-values. The new procedure is designed to give improved results for mixtures which currently cause difficulties in the predictive methods now available. These mixtures are those which contain: (a) hydrocarbons mixed with high concentrations of hydrogen sulfide and/or carbon dioxide, (b) mixtures containing hydrogen, (c) mixtures containing strongly polar components. The procedure is basically designed for use with computers. The mixture properties obtained are compressibility factors, enthalpy, entropy, and densities of liquids and vapors at both high and low pressures from cryogenic temperatures to reservoir conditions. Equilibrium K-values are predicted simultaneously. These properties are essential for: design of heat exchangers, compressors, turbo-expenders, separation processes for gases and liquids, dew point and bubble point calculations, predicting phase changes, and reservoir operations. The advantage of this approach is a much more rigorous and theoretically based composition dependence when using a group of pure component equations of state to predict properties of mixtures of these components.