Binary diffusion coefficients of alpha-pinene and beta-pinene in supercritical carbon dioxide
authors Silva, CM; Filho, CA; Quadri, MB; Macedo, EA
nationality International
journal JOURNAL OF SUPERCRITICAL FLUIDS
author keywords alpha-pinene; beta-pinene; diffusion coefficients; supercritical carbon dioxide; capillary peak broadening technique
keywords TRACER DIFFUSION; FLUID CHROMATOGRAPHY; LENNARD-JONES; DENSE FLUIDS; SUBSTANCES; BENZENE; SOLUTES; DISPERSION; PRESSURE; EQUATION
abstract alpha-Pinene and beta-pinene are two important structural isomers, which appear as major components of the pine tree essential oil. In this work, their binary diffusion coefficients at infinite dilution in supercritical CO2 were measured at 313.15, 323.15 and 333.15 K and pressures ranging from 12 to 20 MPa using the Capillary Peak Broadening technique. The experimental errors found for alpha and beta isomers are 1.28 and 1.92%, respectively. The dependency on pressure, temperature, free-volume and density of carbon dioxide, and solute molar volume at its normal boiling point is examined, as well as the hydrodynamic behaviour. The applicability of several models is evaluated: Dymond, Funazukuri-Hachisu-Wakao, Funazukuri-Ishiwata-Wakao, Catchpole-King, Liu-Silva-Macedo, He-Yu-Su, and Wilke-Chang, Tyn-Calus, Lusis-Ratcliff, Reddy-Doraiswamy and Scheibel. The 1-parameter correlation of Liu-Silva-Macedo achieves the best representation; the Wilke-Chang and Scheibel equations are the best purely predictive models for alpha-pinene and beta-pinene, respectively. (C) 2004 Elsevier B.V. All rights reserved.
publisher ELSEVIER SCIENCE BV
issn 0896-8446
year published 2004
volume 32
issue 1-3
beginning page 167
ending page 175
digital object identifier (doi) 10.1016/j.supflu.2004.01.003
web of science category Chemistry, Physical; Engineering, Chemical
subject category Chemistry; Engineering
unique article identifier WOS:000225199000019
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