Abstract
Solid–liquid phase transitions of vanillin, ethylvanillin, o-vanillin and o-ethylvanillin in presence of compressed CO 2 were determined with the modified capillary method. Furthermore, the solubilities of the above mentioned vanillins in supercritical CO 2 were measured at 313.2, 333.2 and 353.2 K and in the pressure range 8–30 MPa using a static–analytic method. The experimental equilibrium solubility data have been fitted to the Peng–Robinson equation in combination with two parameter van der Waals mixing rules and binary parameters were determined from the best fit. Results showed that the phase equilibria of vanillins in dense CO 2 are influenced by the position of the hydroxyl group bound to the aromatic ring. Under the pressure of CO 2 the melting point depression and also the solubility of both o-vanillins was higher than those of p-vanillins. Oppositely, the alchoxy group (methoxy or ethoxy) showed no significant influence on the solubility of vanillins.
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