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Grantee Research Project Results

NCER Grantee Research Project Results

The Thermodynamic Properties of Dilute Supercritical Solutions

EPA Grant Number: U915171
Title: The Thermodynamic Properties of Dilute Supercritical Solutions
Investigators: Mendez-Santiago, Janette
Institution: Georgia Institute of Technology
EPA Project Officer: Jones, Brandon
Project Period: January 1, 1997 through January 1, 2000
Project Amount: $102,000
RFA: STAR Graduate Fellowships (1997)
Research Category: Academic Fellowships , Engineering and Environmental Chemistry , Fellowship - Chemical Engineering

Description:

Objective:

The objective of this research project is to develop a model for the thermodynamic properties (i.e., Henry's law constants, partial molar properties, and solubility) of dilute supercritical solutions.

Approach:

The theory selected to correlate and predict the solubility of solids in supercritical fluids is a simple theory of dilute solutions. The theory leads to a universal relationship, which is linear. In addition, the slope of the line is related to the Krichevskii parameter, which can be used to predict other properties such as partial molar properties, Henry's law constants, and partition coefficients. This theory also can be extended to multicomponent mixtures, where the third component is either a cosolvent or a cosolute. Existing binary solubility data have been correlated, and the applicability of the theory of dilute solutions has been validated. Most of the solubility data follow the expected trend suggested by the theory, and the Krichevskii parameter (from the solubility data) was calculated. The method has been extended to multicomponent mixtures using data available in the literature. Currently, solubility measurements of multicomponent mixtures are being performed to supplement existing data and to incorporate cosolvent and cosolute effects into the theory of dilute solutions.

Supplemental Keywords:

fellowship, supercritical solutions, Henry's law constants, dilute solutions, partial molar properties, partition coefficients, thermodynamics, Krichevskii parameter., RFA, Scientific Discipline, Ecosystem Protection/Environmental Exposure & Risk, Chemical Engineering, Environmental Chemistry, Monitoring/Modeling, chemical characteristics, supercritical solutions modeling, partial molar properties, thermal properties

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The perspectives, information and conclusions conveyed in research project abstracts, progress reports, final reports, journal abstracts and journal publications convey the viewpoints of the principal investigator and may not represent the views and policies of ORD and EPA. Conclusions drawn by the principal investigators have not been reviewed by the Agency.

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