Thermodynamic modeling for supercritical fluid process design

Journal Article · Sat May 01 04:00:00 EDT 1993 · Industrial and Engineering Chemistry Research; (United States)

DOI:https://doi.org/10.1021/ie00017a021· OSTI ID:6467100

Mukhopadhyay, M; Rao, G V.R. ^[1]

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1. Indian Inst. of Tech., Bombay (India)

The present paper describes a predictive model for ascertaining the process parameters toward establishing an economically viable supercritical fluid technology. The model utilizes the Peng-Robinson equation of state with a modified covolume-dependent (CVD) mixing rule to be able to predict the solubility of mixed solids in pure and mixed supercritical carbon dioxide from minimum information, such as the pure component solubilities. The model can predict the solubility data at various temperatures by virtue of its temperature-insensitive CVD interaction parameter. In order to make the model completely predictive, the CVD interaction parameter has been correlated in terms of the easily available pure component properties, such as solid molar volume, van der Waals volumes, and dipole moments. For mixed solvent, however, a more rigorous correlation is needed to account for stronger solute-cosolvent interactions. The validity of the model has also been tested for the solubility predictions of liquid solutes in the supercritical solvent. Slightly higher deviations of the liquid-phase compositions indicate that the mixing rule is rather well suited for the dilute supercritical solution. The utility of the model has been demonstrated for separation of palmitic acid from tripalmitin. The process parameters have been established under the equilibrium condition utilizing the well-predicted crossover pressures and solubility behavior with temperature.

• OSTI ID: 6467100
• Journal Information: Industrial and Engineering Chemistry Research; (United States), Journal Name: Industrial and Engineering Chemistry Research; (United States) Vol. 32:5; ISSN IECRED; ISSN 0888-5885
• Country of Publication: United States
• Language: English

Related Subjects

32 ENERGY CONSERVATION, CONSUMPTION, AND UTILIZATION
320303* -- Energy Conservation
Consumption
& Utilization-- Industrial & Agricultural Processes-- Equipment & Processes
CARBON COMPOUNDS
CARBON DIOXIDE
CARBON OXIDES
CHALCOGENIDES
DISPERSIONS
EQUATIONS
EQUATIONS OF STATE
EQUILIBRIUM
EXTRACTION
MATHEMATICAL MODELS
MIXTURES
OXIDES
OXYGEN COMPOUNDS
PREDICTION EQUATIONS
SEPARATION PROCESSES
SOLUBILITY
SOLVENT EXTRACTION
SOLVENTS
SUPERCRITICAL GAS EXTRACTION