Thermodynamic and Rheological Properties of Solid-liquid Systems in Coal Processing. Quarterly Technical Report, June 1, 1993--August 31, 1993 PDF Download

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Languages : en
Pages : 8

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Book Description
The objective of this project is to develop a model for solid-liquid equilibria and a model for viscosities of the products of coal liquifaction processes. The same characterization procedure and representation by continuous distributions as used in previous work on vapor-liquid equilibria and excess enthalpies of coal liquids will be used. Models when fully developed will give the solid-liquid phase equilibrium properties and viscosities as factors of temperature and pressure for known molecular weight distribution and structural characterization of the coal liquid. To accomplish this well, the project requires three tasks: solid-liquid phase equilibrium model development; experimental viscosity measurements; viscosity model development. Preliminary work on testing of the liquid state equation of state of Thomson et al has been completed. Goodwin has compiled data for benzene and toluene and fitted specific expressions so that smoothed data are generated over a large range of temperatures and pressures. The authors have used these data to test the Thomson et al liquid state equation of state for high pressure density and heat capacity predictions. To obtain a liquid state equation of state that will predict all thermodynamic properties accurately, the authors believe that the vapor pressure correlation, saturated liquid density correlation as well as correlation for parameters B and C of the Tait equation need to be modified by extensive regression using experimental data. They have undertaken such a task and results will be reported in a future report.