Measurement and correlation of solubility of Disperse Blue 14 in supercritical carbon dioxide

The solubility of solid 1,4-dimethylaminoanthraquinone (Disperse Blue 14) in supercritical carbon dioxide has been determined in the pressure range of 100–350 bar and in the temperature range of 313–353 K. The values obtained have been correlated with two types of model: the first is based on empirical and semiempirical equations and the second is based on thermodynamic aspects and the use of equations of state, namely Redlich–Kwong (RK), Soave–Redlich–Kwong (SRK) and Peng–Robinson (PR) equations. The thermodynamic model, based on fitting the solid sublimation pressure and binary interaction parameter, shows better agreement with the experimental data than the empirical and semiempirical equations.