Vapor-liquid and liquid-liquid equilibrium for polar coal mixtures
Analytical procedures for the calculation of thermodynamic properties for polar mixtures including those containing coal model compounds have been developed with the use of the Wu-Stiel equation of state in conjunction with pseudocritical rules. The input values required are only the critical constants, acentric factors, and polarity factors of the components. These characterization parameters for polar coal model compounds have been determined by simultaneous use of experimental data for vapor pressure, liquid density, and latent heat of vaporization. Based on the corresponding states principle, new generalized relationships have been developed for the accurate calculation of heats of vaporization of polar substances. Interaction constants of the mixtures are obtained by procedures for the calculation of the interaction second virial coefficients with improved relationships for the molecular parameters in the pre-averaged potential function of Lin and Stiel (1977) for polar fluids. These improved relationships which can be applied to a wide range of polar substances enable good representation of thermodynamic properties for nonpolar-polar coal systems from just the characterization parameters of the components. Predictions of liquid-liquid equilibrium properties have been performed for representative nonpolar-polar acetone systems. For accurate calculation of these properties, it has been found that nonlinear composition dependence for the shape and polarity parameters of the Wu-Stiel equation of state of the mixture are necessary. Procedures have been established to determined the nonlinear relationships for these mixture parameters from experimental heat of mixing data.
- Research Organization:
- Polytechnic Univ., Brooklyn, NY (USA)
- OSTI ID:
- 7042722
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
010600* -- Coal
Lignite
& Peat-- Properties & Composition
ACETONE
CALCULATION METHODS
COAL LIQUIDS
CORRELATIONS
DENSITY
DISPERSIONS
ENTHALPY
EQUATIONS
EQUATIONS OF STATE
EQUILIBRIUM
FLUIDS
FORECASTING
GASES
KETONES
LIQUIDS
MIXTURES
ORGANIC COMPOUNDS
PHYSICAL PROPERTIES
POLAR COMPOUNDS
THERMODYNAMIC PROPERTIES
TRANSITION HEAT
VAPOR PRESSURE
VAPORIZATION HEAT
VAPORS