Supercritical Fluids: Measurement and Correlation Studies of Model Coal Compound Solubility and the Modeling of Solid-Liquid-Fluid Equilibria

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https://hdl.handle.net/2142/69781

Author(s)

Hess, Barry Samuel

Issue Date

1987

Department of Study

Chemical Engineering

Discipline

Chemical Engineering

Degree Granting Institution

University of Illinois at Urbana-Champaign

Degree Name

Ph.D.

Degree Level

Dissertation

Keyword(s)

Engineering, Chemical

Abstract

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.

Graduation Semester

1987

Type of Resource

text

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http://hdl.handle.net/2142/69781

Graduate Theses and Dissertations at Illinois