Measurement and correlation of solubility of anthraquinone dyestuffs in supercritical carbon dioxide

• Published in: The Journal of chemical thermodynamics 2014-07, Vol.74, p.119-125
• Main Authors: Alwi, Ratna Surya, Tanaka, Tatsuro, Tamura, Kazuhiro
• Format: Article
• Language: English
• Subjects: Anthraquinone: Dyestuffs, Correlation; Anthraquinones; Carbon dioxide; Density; Disperse; Dyes; Mathematical models; Solubility; Solvents; Supercritical carbon dioxide
• ISSN: 0021-9614; 1096-3626
• DOI: 10.1016/j.jct.2014.01.015

•Solubility of anthraquinone dyestuffs in supercritical carbon dioxide was obtained.•Measured at T=(323.15, 353.15, and 383.15)K and at (12.5 to 25.0)MPa.•Correlated with empirical equations expressed in terms of sc-CO2 density.•Analyzed thermodynamically by solution model and PRSVera equation of state.•Good agreement between experimental and calculated solubilities was obtained. Solubility data of 1,4-diaminoanthraquinone (C.I. Disperse Violet 1) and 1,4-bis(ethylamino)anthraquinone (C.I. Solvent Blue 59) in supercritical carbon dioxide (sc-CO2) have been measured at the temperatures of (323.15, 353.15, and 383.15)K and over the pressure range from (12.5 to 25.0)MPa by a flow-type apparatus. The solubility of two anthraquinone dyestuffs was obtained over the mole fraction ranges of (1.3 to 26.1)·10−7 for 1,4-diaminoanthraquinone (C.I. Disperse Violet 1) and (1.1 to 148.5)·10−7 for 1,4-bis(ethylamino)anthraquinone (C.I. Solvent Blue 59). The experimental results have been correlated with the empirical equations of Mendez-Santiago–Teja and Kumar–Johnston expressed in terms of the density of sc-CO2, and also analyzed thermodynamically by the regular solution model with the Flory–Huggins theory and the Peng–Robinson equation of state modified by Stryjek and Vera (PRSV-EOS) with the conventional mixing rules. Good agreement between the experimental and calculated solubilities of the dyestuffs was obtained.