Solubility and data correlation of a reactive disperse dye in a quaternary system of supercritical carbon dioxide with mixed cosolvents

摘要

Mixed cosolvents involving acetone and water were applied in hydrophobically supercritical carbon dioxide medium for modifying the solubility behavior of a new reactive disperse orange SCF-AOL2 dye. Then the equilibrium solubility of the dye solute in the quaternary system of supercritical carbon dioxide with the mixed cosolvents was measured at temperature from 333.2 K to 393.2 K and pressure from 8.0 MPa to 22.0 MPa with an equilibrium time of 60 min in a home-built batch circulation system. The experimental results show that a significant improvement of the dye solubility and its behavior was achieved in the presence of the mixed cosolvents in supercritical carbon dioxide, especially with the tested system pressure in different solubility isotherm curves. Moreover, the achieved experimental data were further correlated, validated and predicted successfully by employing several typically semi-empirical models for the quaternary system with mixed cosolvents. It is most important that a new and specially derived model based on the conventional and modified Mendez-Santiago-Teja ones was also proposed and successfully applied to the quaternary system with a significant improvement and highest accuracy than the employed other ones. Furthermore, better correlations were also achieved from the conventional Chrastil and the Del Valle-Aguilera models than other ones for the employed system. (C) 2018 Taiwan Institute of Chemical Engineers. Published by Elsevier B.V. All rights reserved.