The solubility of disperse dyes, CI disperse red 60 and CI disperse orange 3 in supercritical carbon dioxide have been measured at temperatures from 323.7 K to 413.7 K and pressures from 100 bar to 300 bar, using a flow-type equilibrium cell. The solubility data are correlated with an expanded liquid model which needs no critical properties of dyes, as well as an empirical equation.

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An apparatus is newly designed and constructed for investigation of high-pressure vapor-liquid equilibrium in the temperature range-50°C to 50°C at pressures up to 100 atm. The visual type of static apparatus is distinguished by the inclusion of a specially designed sampling device for liquid phase to reduce experimental error during the sampling, and of a magnetically driven agitator by which the vapor phase is dispersed into the liquid phase within the cell. Using this apparatus, the binary vapor-liquid equilibrium data for the ethylene-propylene system at-10.08°, 0.07°, 10.07°and 20.14°C, and ethylene-1-butene at-0.01°, 10.01°and 20.20°C are measured. The data obtained are correlated by using three equations of state. The predicted results are in good agreement with the experimental data except in the region close to the critical point.

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