Phase equilibrium properties of coal-derived liquids. Technical progress report, July-December 1980

Abstract

A wide variety of methods have been used to study the phase behavior of mixtures, including: Measuring the phase boundary of binary mixtures, observing property discontinuities from volumetric measurements, and thermal measurements of mixtures, measuring the composition of samples in batch systems, measuring the composition of samples from continuous remixing and separation in recirculating systems, gas-liquid chromatography, and measuring the composition of samples from a once-through flow system. A major difficulty associated with measuring phase behavior of complex mixtures is the need to characterize the vapor and liquid sample products. This generally requires the collection of considerable quantities of the liquid and vapor products. Of all the methods listed, the only method which can generate significant quantities of both liquid and vapor products is the once-through flow method. This method has been used previously in determining the K values for petroleum fractions. For these reasons, we have designed a flow equilibrium flash vaporization system similar to the ones previously used on petroleum liquids.