Supercritical fluids: measurement and correlation studies of model coal compound solubility and the modeling of solid-liquid-fluid equilibria

Thesis/Dissertation · Thu Jan 01 04:00:00 EST 1987

OSTI ID:5494709

Hess, B S

The solubilities of a number of model coal compounds have been measured in supercritical carbon dioxide, butane, ammonia, and ethanol utilizing dynamic flow apparatuses. The data base of supercritical solubilities has been extended to include solvents with higher critical temperatures than previously investigated. Studies have been made to determine the feasibility of using pure supercritical fluids to effect separations, but do not seem to indicate that this is possible. It has been shown that if an equation of state is used to correlate supercritical solubility data, then equations with the same number of adjustable parameters, regardless of their derivation, perform equally well in their representation of the data. The different equations, however, exhibit slight disparities in their qualitative representations of the correlation but the numerical results are quite similar. Another part of this study was the modeling of the three-phase, solid-liquid-fluid, equilibria. The dissolution of a supercritical fluid in an equilibrium liquid phase may be quite substantial and markedly affects the thermodynamic properties of that liquid. If, however, the liquid is not too near its critical point, it may be treated by any of the conventional methods for characterizing normal liquids. This result is illustrated by the successful modeling of the melting point behavior for various solids in supercritical fluids, outside the region of volume dilation of the liquid phase.

• Research Organization: Illinois Univ., Urbana (USA)
• OSTI ID: 5494709
• Country of Publication: United States
• Language: English

Related Subjects

01 COAL, LIGNITE, AND PEAT
010400 -- Coal
Lignite
& Peat-- Processing
010600* -- Coal
Lignite
& Peat-- Properties & Composition
ALCOHOLS
ALKANES
AMMONIA
BUTANE
CARBON COMPOUNDS
CARBON DIOXIDE
CARBON OXIDES
CHALCOGENIDES
COAL LIQUIDS
CRITICAL TEMPERATURE
DISSOLUTION
EQUATIONS
EQUATIONS OF STATE
ETHANOL
FLUIDS
HYDRIDES
HYDROCARBONS
HYDROGEN COMPOUNDS
HYDROXY COMPOUNDS
LIQUIDS
MATHEMATICAL MODELS
NITROGEN COMPOUNDS
NITROGEN HYDRIDES
ORGANIC COMPOUNDS
OXIDES
OXYGEN COMPOUNDS
PHASE STUDIES
PHYSICAL PROPERTIES
SEPARATION PROCESSES
SOLIDS
SOLUBILITY
SOLVENT PROPERTIES
THERMODYNAMIC PROPERTIES
TRANSITION TEMPERATURE