Binary diffusion coefficients, partition ratios and partial molar volumes at infinite dilution for β-carotene and α-tocopherol in supercritical carbon dioxide

Binary diffusion coefficients D 12 and partition ratios k at infinite dilution for β-carotene and α-tocopherol in supercritical carbon dioxide were measured at temperatures from 308.15 to 333.15 K and pressures from 9 to 30 MPa by a tracer response technique with a poly(ethylene glycol) coated capil...

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Bibliographic Details
Published in:The Journal of supercritical fluids 2003-09, Vol.27 (1), p.85-96
Main Authors: Funazukuri, Toshitaka, Kong, Chang Yi, Kagei, Seiichiro
Format: Article
Language:English
Subjects:
Binary diffusion coefficient
Carbon dioxide
Partial molar volume
Partition ratio
Supercritical
Tracer response
α-Tocopherol
β-Carotene
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Summary:Binary diffusion coefficients D 12 and partition ratios k at infinite dilution for β-carotene and α-tocopherol in supercritical carbon dioxide were measured at temperatures from 308.15 to 333.15 K and pressures from 9 to 30 MPa by a tracer response technique with a poly(ethylene glycol) coated capillary column. Both parameters, simultaneously determined by fitting the calculated response curve to that measured experimentally, were well represented with the correlations: the D 12/ T values were correlated with CO 2 viscosity, and the k values were expressed with a function of temperature and CO 2 density. However, the partial molar volumes obtained from the k values were not well consistent with those estimated using equation of states having the interaction parameters k ij reported in the literature.
ISSN:0896-8446
1872-8162
DOI:10.1016/S0896-8446(02)00209-7