Abstract
Tracer diffusivities, D12, of eucalyptol in liquid ethanol and in supercritical carbon dioxide (SC-CO2) mixed with ethanol (8.0wt.%) were measured in the temperature range 303.15–333.15K, using the chromatographic peak broadening technique. The obtained diffusivities ranged from 0.912×10−5 to 1.578×10−5cm2s−1 for the binary system (pressure range 1–100bar) and from 0.547×10−4 to 1.042×10−4cm2s−1 for the ternary system (pressure range 150–275bar). The dependence of D12 on temperature, pressure, solvent density, and Strokes-Einstein coordinates were deeply examined. Such trends were interpreted and discussed in terms of free volume theories and hydrodynamic fundamentals. Various prediction/correlation models were assessed to calculate D12, with the best results (deviations of 1.20–7.00%) obtained with Dymond–Hildebrand–Batschinski equation, the Tracer Liu-Silva-Macedo (TLSMd) model, four correlations of Magalhães et al., and a modified Stokes-Einstein equation. Lai-Tan and Wilke-Chang correlations attained reliable results (errors of 8.36 and 8.00%) in the case of eucalyptol/SC-CO2/ethanol system.
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