Abstract
The solubility of stearic acid in supercritical CO 2 with n-octane and acetic acid cosolvents was measured at 308.15 K in the pressure range from 80 to 160 bar and the cosolvent concentrations range from 0.0 to 3.5 mol%. The density of the fluid phase was also determined. The solubility increases with the concentrations of the cosolvents (Y 3) and pressure. However, the solubility increases very slowly with Y 3 at higher Y 3 when acetic acid is used as a cosolvent, mainly because acetic acid can associate with itself. In CO 2-acetic acid mixture, the solubility increases with Y 3 provided that the apparent density of CO 2 d 1 (moles of CO 2 per liter of fluid) is fixed. In CO 2- n-octane mixture, the solubility also increases with Y 3 at higher d 1. However, at lower d 1 and Y 3 the solubility decreases with Y 3 at fixed d 1. It was found that clustering between CO 2 and the cosolvent reduces the efficiency of CO 2 to dissolve the solute.
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