High-Pressure Phase Equilibria of Carbon Dioxide + 1-Butanol, and Carbon Dioxide + Water + 1-Butanol Systems

Phase equilibria data for CO 2 + 1-butanol and CO 2 + water + 1-butanol systems have been measured in the pressure range from 50 bar to 130 bar at 333.15, 343.15, and 353.15 K. A novel phase behavior apparatus was used for the measurements. For the CO 2 + 1-butanol binary system, only vapor−liquid-phase equilibria were observed over the whole range. For the CO 2 + water + 1-butanol ternary system, experimental observations were made of three single-phase regions, one vapor−liquid−liquid equilibrium region, two vapor−liquid equilibrium regions, and one liquid−liquid equilibrium region.