Supercritical extraction of organic compounds from aqueous and solid matrices /
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| Other Authors: | , , |
| Format: | Thesis Book |
| Language: | English |
| Published: |
1991.
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| Subjects: | |
| Online Access: | Link to OAKTrust copy |
| Abstract: | Supercritical fluid extraction of various organic compounds from aqueous and solid matrices has been conducted in a single stage equilibrium extraction vessel. For aqueous extraction, benzene, toluene, naphthalene, and parathion were selected as model organic contaminants. Aqueous solutions were prepared by dissolving the individual organic compounds in water, resulting in four different binary solutions, and by dissolving the mixture of all four compounds in water, resulting in a five-component solution. The model aqueous solutions were extracted by supercritical carbon dioxide. The equilibrium distribution coefficients of the organic compounds between the aqueous phase and the supercritical carbon dioxide phase were measured at 318 and 330 K as a function of pressure up to 11.0 MPa. The distribution coefficients of benzene and toluene were of the order 10^3, naphthalene 10^2, and parathion 10. All distribution coefficients increased with pressure and decreased with temperature. A thermodynamic model was developed for prediction of the two-phase multicomponent system behavior. A P-T flash calculation, combined with the Peng-Robinson equation of state and composition-dependent mixing rules, was carried out to calculate the distribution coefficient of each compound. The six-component system data at two temperatures were predicted with reasonable accuracy using the interaction parameters obtained from the literature and from the ternary data at a single temperature. The distribution coefficient of each compound in the six-component system increased in comparison to the ternary system data for each compound, indicating entrainer type behavior. Solid matrix extractions were performed by slurrying the contaminated solid with water which introduced a three-phase (supercritical fluid - water - solid) equilibrium system... |
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| Item Description: | Typescript (photocopy). Vita. "Major subject: Chemical Engineering." |
| Physical Description: | xii, 125 leaves : illustrations ; 29 cm |
| Bibliography: | Includes bibliographical references. |