Solubilities of Oxygenated Aromatic Solids in Pressurized Hot Water

Aqueous solubilities of xanthene (C₁₃H₁₀O), anthrone (C₁₄H₁₀O), xanthone (C₁₃H₈O₂), thioxanthone (C₁₃H₈OS), 9,10-anthraquinone (C₁₄H₈O₂), and 9,10-phenanthrenequinone (C₁₄H₈O₂) were measured at temperatures from 313 K to the solute melting point and pressures close to 5 MPa by a dynamic method combined with gas chromatography/mass spectrometry. The experimental solubilities were used to estimate the activity coefficients of the solutes in the aqueous solutions at saturation. Relative rates of increase of solute solubility (mole fraction) with temperature ranged from 0.049 K⁻¹ to 0.056 K⁻¹.