Correlation of phase-separation data for coal-conversion systems

A multiparameter corresponding‐states correlation is applied to describe fossil‐fluid vapor/liquid‐equilibrium behavior needed to design separation and other process units in coal‐liquefaction plants. Data for both defined and undefined fluids pertinent to coal liquefaction are utilized in correlation development. The procurement of these data requires a thorough evaluation and study of the needs for additional data to improve correlations. These needs are systematically outlined in the context of the level of predication capability that can be achieved using the currently available data base. A conformal‐solution model is applied to describe the behavior of many defined binary and ternary coal‐solvent systems. The correlation is then extended to undefined systems such as those encountered in the Exxon Donor Solvent process. Correlation results are reported and correlation limits are assessed.