Thermodynamics Research Center / ThermoML | Journal of Chemical and Engineering Data

ABSTRACT

Solubilites of 1,4-diamino-2,3-dichloroanthraquinone (C.I. Disperse Violet 28) and 1,8-dihydroxy-4,5-dinitroanthraquinone in supercritical carbon dioxide (sc-CO2) were measured at the temperature of (323.15, 353.15 and 383.15) K and over pressure ranges (12.5 to 25.0) MPa by a flow-type apparatus. Mole fraction solubility of 1,4-diamino-2,3-dichloroanthraquinone (C.I. Disperse Violet 28) is found significantly higher than that of 1,8-dihydroxy-4,5-dinitroanthraquinone. It was found that 2,3-dichloro group addition onto 1,4-diaminoanthraquione leads to higher solubility of 1,4-diaminoanthraquinone and the addition of 8-hydroxy-5-nitro group on 1-hydroxy-4-nitroanthraquione causes lower solubility than that of 1-hydroxy-4-nitroanthraquinone. Three semiempirical density-based models, Mendez Santiago Teja, Sung Shim, and Bartle et al., were used to correlate the experimental results. Moreover, the solubilities of anthraquinone derivatives were analyzed thermodynamically by the regular solution model with the Flory Huggins theory and by the Peng Robinson equation of state with a modification of Stryjek and Vera (PRSV-EOS). The calculated solubilities of anthraquinone derivatives were in good agreement with the experimental results.