Binary Diffusion Coefficients of Arachidonic Acid Ethyl Esthers, cis-5,8,11,14,17-Eicosapentaenoic Acid Ethyl Esthers, and cis-4,7,10,13,16,19-Docosahexanenoic Acid Ethyl Esthers in Supercritical Carbon Dioxide

Abstract

The binary diffusion coefficients of arachidonic acid ethyl esthers (AA-EE), 8,11,14,7,10,13,16, in supercritical carbon dioxide were measured at temperatures from 308.15 K to 338.15 K and pressures from 8.42 MPa to 29.95 MPa by the Taylor-Aris capillary peak broadening method. The obtained diffusion coefficients are in the range of (5.54 × 10 -5 ) cm 2 ‚s -1 to (13.8 × 10 -5 ) cm 2 ‚s -1 with small differences between AA-EE, EPA-EE, and DHA-EE. The measured D 12 values were fitted with absolute average deviations of less than 2 % by three predictive models: Scheibel, Catchpole-King, and He-Yu-Su.