title: Dissolution, cyclodextrin-enhanced solubilization, and mass removal of an ideal multicomponent organic liquid.
abstract: Laboratory experiments and mathematical modeling were conducted to examine the influence of a hydroxypropyl-beta-cyclodextrin (HPCD) solution on the dissolution of single- and three-component organic liquids. The results of batch experiments showed that HPCD-enhanced solubilization of the organic-liquid mixtures was ideal (describable using Raoult's Law), and that solubilization-enhancement factors were independent of mixture composition. Addition of the HPCD solution to columns containing residual saturations of the organic liquid enhanced the dissolution and removal of all three compounds in the mixture. The results of the column experiments and mathematical modeling suggest that solubilization was ideal for both water and cyclodextrin flushing. Concomitantly, the mass-flux reduction versus mass removal behavior was ideal for all experiments. Mass transfer was increased for HPCD solubilization relative to the water flushing due to solubility and concentration-gradient enhancement. Organic-liquid composition did not significantly impact mass transfer coefficients, and fractional mass removal behavior during HPCD solubilization was nearly identical for each compound whether present as a single component or in a mixture. Additionally, mass transfer coefficients for aqueous and HPCD solubilization for single and multicomponent mixtures were not statistically different upon normalizing by the solubility enhancement factor.
authors.affiliation: Department of Soil, Water and Environmental Science, University of Arizona, 429 Shantz Building #38, P.O. Box 210038, Tucson, Arizona 85721-0038, USA.
authors.forename: Kenneth C
authors.initials: KC
authors.lastname: Carroll
authors.forename: Mark L
authors.initials: ML
authors.lastname: Brusseau
mesh_terms: D000073738:2-Hydroxypropyl-beta-cyclodextrin; D004785:Environmental Pollutants / Q000737:chemistry*; D005742:Gasoline / Q000032:analysis; D006841:Hydrocarbons, Aromatic / Q000737:chemistry*; D008962:Models, Theoretical; D012995:Solubility; D012997:Solvents / Q000737:chemistry*; D047392:beta-Cyclodextrins / Q000737:chemistry*
chemical_list: D004785:Environmental Pollutants; D005742:Gasoline; D006841:Hydrocarbons, Aromatic; D012997:Solvents; D047392:beta-Cyclodextrins; D000073738:2-Hydroxypropyl-beta-cyclodextrin