Thermodynamics Research Center / ThermoML | Journal of Chemical Thermodynamics

ABSTRACT

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.