Measurements of Binary Diffusion Coefficient and Partition Ratio at Infinite Dilution for Linoleic Acid and Arachidonic Acid in Supercritical Carbon Dioxide

• Published in: Journal of chemical and engineering data Vol. 48; no. 3; pp. 684 - 688
• Main Authors: Funazukuri, Toshitaka, Kong, Chang Yi, Kikuchi, Takahiro, Kagei, Seiichiro
• Format: Journal Article
• Language: English
• Published: Washington, DC American Chemical Society 08.05.2003
• Subjects: Biological and medical sciences; Chemistry; Exact sciences and technology; Fat industries; Food industries; Fundamental and applied biological sciences. Psychology; General and physical chemistry; Solution properties; Solutions; Capillary column; Viscosity; Tracer technique; Correlation; Transport properties; Infinite dilution; Carbon dioxide; Schmidt number; Polyunsaturated fatty acid; Partition coefficient; Arachidonic acid; Experimental study; Coated material; Linoleic acid; Ethylene oxide polymer; n-6 fatty acid; Supercritical solvent; Diffusion coefficient; Physicochemical properties; Rheological properties
• ISSN: 0021-9568; 1520-5134
• DOI: 10.1021/je020205i

The binary diffusion coefficient D 12 and partition ratio k were measured for two ω6 group compounds, linoleic acid and arachidonic acid, at infinite dilution in carbon dioxide at temperatures from 308.15 K to 343.15 K and pressures from 9 MPa to 30 MPa by a tracer response technique with a poly(ethylene glycol)-coated capillary column. The measured D 12 values were well represented by a correlation of D 12/T versus CO2 viscosity and by the Schmidt number correlation for each solute, and the k values were well represented as a function of temperature and CO2 density. Partial molar volumes were also obtained from the k values.