High-Pressure Phase Equilibrium of CO₂ + 2-Phenylethanol and CO₂ + 3-Methyl-1-butanol

Abstract

Phase equilibrium for CO 2 + 2-phenylethanol and CO 2 + 3-methyl-1-butanol was measured. The two alcohols are both major constituents of wine aroma. The experimental apparatus includes a transparent high-pressure cell made of a sapphire cylinder, which allows full visual observation of the inside. Measurements were performed at temperatures of (313.1 and 323.1) K and at pressures from (8 to 24) MPa for the system CO 2 + 2- phenylethanol and pressures from (5 to 10) MPa for the system CO 2 + 3-methyl-1-butanol. The experimental results were fitted with the Stryjek−Vera modification of the Peng−Robinson cubic equation of state, using the composition-dependent mixing rules of Panagiotopoulos and Reid.