CALCULATION OF HIGH-PRESSURE VAPORLIQUID EQUILIBRIA

<正> Using the principle of corresponding states (PCS) of molecular shape factors, the highpressure vapor-liquid equilibrium for a binary system of light gases with hydrocarbons is calculated. The van der Waals one-fluid mixture model, with two binary interaction parameters, is used to determine the conformal parameters needed to describe mixture behavior, and the Marquardt optimization nonlinear program is used to determine optimum values of parameters. The calculated equilibrium ratios by specifying temperatures as functions of pressures agree well with experimental data. Only two conformal parameters are needed in the shape factor method for calculating mixtures.