Binary diffusion coefficients of alpha-pinene and beta-pinene in supercritical carbon dioxide

• Type: Article in International Scientific Journal
• Date: 2004

Authors

Carlos M. Silva (Author) Other; Cláudio A. Filho (Author) Other; Marintho B. Quadri (Author) Other; Maria Eugénia Macedo (Author) FEUP

Journal

Title: Journal of Supercritical Fluids

Vol. 32 No. 1-3

Pages: 167-175

ISSN: 0896-8446

Publisher: Elsevier

Indexing

ISI Web of Knowledge - 32 Citations

ISI Web of Science

Scopus - 40 Citations

Other information

Authenticus ID: P-000-7JF

DOI: 10.1016/j.supflu.2004.01.003

Abstract (EN): 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.

Language: English

Type (Professor's evaluation): Scientific

No. of pages: 9