Solubilities of Some 1,4-Dihydroxy-9,10-anthraquinone Derivatives in Supercritical Carbon Dioxide

The equilibrium solubilities of three recently synthesized 9,10-anthraquinone derivatives have been measured in supercritical carbon dioxide using a simple and reliable static method. The measurements were performed in the pressure range 121.6 to 405.3 bar at temperatures (35, 45, 55, 65, and 75) °C. The measured solubilities were correlated using the model proposed by Chrastil. The calculated results show good agreement with the experimental data.