Miscibility, Solubility and Retrograde Prediction of Methane in Liquids. (Storageof Methane in Liquids for Vehicle Fuel). Annual Report, July 15, 1991-July 15, 1992

摘要

The research work consists of developing accurate techniques for thermodynamicmodeling of miscibility and solubility of methane in liquids, the related retrograde phenomena, properties of partially miscible systems, and solubilities (infinite dilution conditions). Findings of the project has applications in enhanced condensing-gas-drive recovery processes and liquid storage of natural gas. Initial success was achieved in the development of exact expressions for the infinite dilution chemical potentials of components of mixtures in terms of molecular size and energy parameters. These equations are tested with the use of simulation data with success. The problem of relating the interfacial tension of two partially miscible liquids to their surface tensions with their respective vapors is also studied in the light of statistical mechanics. An accurate relation between these properties, density changes of components in the two liquid phases and density changes of pure components with their saturated vapors is developed using a mathematical artifact. Accuracy of the equation obtained is tested by comparison with the experimental data with very promising conclusions.