Solid-liquid-gas equilibria in multicomponent supercritical fluid systems

Lemert, Richard M.; Johnston, Keith P.

doi:10.1016/0378-3812(89)80262-6

Cited by 71 publications

(48 citation statements)

References 28 publications

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“…normally 122.5"C; however, in the presence of a SCF this can be lowered significantly. In the presence of pure C02, 2-naphthol's melting point is lowered to 107°C at 210 bar; with C 0 2 and 4% methanol, the melting point is lowered to 63°C at 204 bar, and 43°C at 107 bar (Lemert and Johnston, 1989). In both cases, the UCEP was over 200 bar.…”

Section: Resultsmentioning

confidence: 96%

“…Despite the great potential of using cosolvents, there are relatively few data in the literature for solubility of solutes in mixed SCF's (Dobbs et al, 1986;Schmitt and Reid, 1986;Wong and Johnston, 1986;Van Alsten, 1986;Schaeffer et al, 1988;Lemert and Johnston, 1989;Tavana et al, 1989;Cygnarowicz et al, 1990;Hollar and Ehrlich, 1990;Smith and Wormald, 1990;Gurdial and Foster, 1991). One reason is that conventional techniques of measuring solubilities in SCF solutions are timeconsuming and require large amounts of pure solute.…”

Section: Introductionmentioning

confidence: 96%

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Cosolvent interactions in supercritical fluid solutions

et al. 1993

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The addition of cosolvents to supercritical fluid (SCF) solvents can have large effects on solubilities, giving engineers the ability to tailor loadings and selectivities of solutes for difficult separations. It is necessary to have a better understanding of the special intermolecular interactions that occur in SCF solutions to predict the effects of cosolvents. We use u SCF chromatographic technique to acquire a database of cosolvent effects for a variety of cosolvents and solutes; examination of the cosolvent effects shows evidence of hydrogen bonding, charge transfer complex formation, and dipole-dipole coupling between solute and cosolvent molecules. SCF solvents, carbon dioxide, ethane, and fluoroform, are compared, and then the use of the chromatograph to measure solubilities is discussed.

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Section: Resultsmentioning

confidence: 96%

Section: Introductionmentioning

confidence: 96%

Cosolvent interactions in supercritical fluid solutions

et al. 1993

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“…Examples of tie lines that extend to a binary axis are described by Walas (1985). Schematic tie lines are shown to the right of the three-phase region, although such lines could be calculated with a model in the literature (Lemert and Johnston, 1989). These tie lines emanate from the pure naphthalene vertex as described previously (Koningsveld and Diepen, 1983).…”

Section: Predicted Ternary-phase Behavior At Finite Concentration Fromentioning

confidence: 99%

Molecular thermodynamics of solute‐polymer‐supercritical fluid systems

Shim

Johnston

1991

AIChE Journal

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“…Thus, a single fluid phase with y 2 = ψ 2 is next postulated, and this is tested for phase stability as described above. If the test indicates stability, then the equilibrium state is a single fluid phase with y 2 = ψ 2 ; otherwise two fluid phases are next postulated, and we again initiate the two-stage 21 procedure described in section 3.3 that alternates between phase split and phase stability calculations until the correct number of phases and phase compositions are found.…”

Section: Problem-solving Strategymentioning

confidence: 99%

Phase Behavior and Reliable Computation of High-Pressure Solid−Fluid Equilibrium with Cosolvents

Scurto

Brennecke

et al. 2003

Ind. Eng. Chem. Res.

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The identification of the correct, stable solution to a phase equilibrium problem, given a particular thermodynamic model, is essential for the design of separation processes.It is also important in the selection of an appropriate model to represent experimental data.The need for a completely reliable method to test for phase stability is particularly pressing when the number of phases likely to be present is not intuitive to the user, as is frequently the case with high-pressure systems. Previously, we have a presented a completely reliable computational technique, based on interval analysis, to correctly identify phase equilibrium and test for phase stability in binary solvent-solute systems, that include the possibility of a solid phase, using any of a variety of cubic equations of state as the thermodynamic model.Here we extend the methodology to include multicomponent solvent-solute-cosolvent systems where the likelihood of additional phase formation is even greater than in the binary case. Gaseous or liquid cosolvents are frequently used in supercritical fluid extraction processes, and are integral in processes such as the gas anti-solvent process (GAS) to precipitate uniform solid particles. Using several examples from the literature, we demonstrate how the new computational technique can be used to identify experimental data that may have been misinterpreted and to identify models that do not predict what the modeler intended.

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Solid-liquid-gas equilibria in multicomponent supercritical fluid systems

Cited by 71 publications

References 28 publications

Cosolvent interactions in supercritical fluid solutions

Cosolvent interactions in supercritical fluid solutions

Molecular thermodynamics of solute‐polymer‐supercritical fluid systems

Phase Behavior and Reliable Computation of High-Pressure Solid−Fluid Equilibrium with Cosolvents

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