Abstract
The solubilities of disperse dyes in perchloroethylene have been examined by the concept of the regular solution in order to obtain the basic information on solvent dyeing. The solubilities were determined at 5°C intervals from 5° to 40°C. From these values, the solubilities of the dyes in the super-cooled liquid state were calculated by considering the relative activity.
If the solution is regular, the entropy of mixing should be ideal and the change in the partial molar entropy of the dyes in the mixing process should be expressed by the following equation, where X°11 stands for the solubility of the dye in the liquid state.
The change in the partial molar entropy of the dyes in the mixing process calculated by equation (2) was compared with Δ_??_theo.
Considering the simplicity of the model and the fact that the determination of the relative activity was accompanied by a considerable error, the agreement between theory and experiment was fairly good.
