Solubilities of 1-Eicosanol and Eicosanoic Acid in Supercritical Carbon Dioxide from 308.2 to 328.2 K at Pressures to 21.26 MPa

Abstract

The phase behavior of low-volatile components in supercritical fluid has received wide attention in recent years for potential applications in industrial fields (1,2). However, limited studies on the solubilities of heavy alcohols and their related fatty acids in carbon dioxide are presented in the literature. Kramer and Thodos (3 ,4) have measured the solubilities of 1-hexadecanol, 1-octadecanol, palmitic acid, and stearic acid in supercritical carbon dioxide. Schneider et al. (5-7) have reported the solubilities of 1-hexadecanol and 1-octadecanol in supercritical carbon dioxide a t 333 and 393 K. Giddings et al. (8, 9) have measured the solubilities of 1-octadecanol in dense supercritical carbon dioxide at 313 K. Iwai et al. (10) have measured the solubilities of 1-octadecanol, 1-eicosanol, and stearic acid in supercritical carbon dioxide at 308.2 K up to 23.7 MPa. Hamatani (11) has measured the solubilities of 1-octacosanol and 1-triacontanol in supercritical carbon dioxide. The solubilities of 1-hexadecanol and 1-octadecanol in supercritical carbon dioxide over the temperature range from 302 to 338 K at pressures from 5.0 to 20.5 MPa and the solubilities of lauric acid, palmitic acid, and arachidic acid in carbon dioxide over the temperature range from 373.2 to 473.2 K a t pressures up to 5.07 MPa have been measured previously (12, 13). Although some solubility data of heavy alcohols and their related fatty acids in carbon dioxide have been reported, none have been studied in detail from low pressure to high pressure. In this work the solubilities of 1-eicosanol and eicosanoic acid in carbon dioxide over the temperature range from 308.2 to 328.2 Ka t pressures from 33.7 to 212.6 bar have been measured, and the measured data are correlated by the proposed equations.