Abstract
Pressure versus temperature solid-liquid-gas (S-L-G) lines were determined visually for naphthalene in CO 2 with and without the co-solvent n-pentane and for 2-naphthol with and without methanol. In the nonpolar sytem, the addition of a small amount of co-solvent causes small changes in the melting point depression but large changes in the pressure of the upper critical end point (UCEP). In the polar system, the increase in the melting point depression is pronounced. An equation of state and Regular Solution Theory are used in a synergistic manner in order to correlate the S-L-G behavior over a wide range of pressure, and to interpret the results as a function of the calculated compositions in the liquid phase. The implications of this behavior on supercritical fluid separation processes are discussed.
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