The binary system H 2 O-CO 2 at high temperatures and pressures

Abstract

The system water-carbon dioxide was studied to pressures of 1,600 bars and at temperatures of 110 degrees C to 350 degrees C. Preliminary work was done also up to pressures of 3,000 bars. The critical curve of the system trends toward higher pressures at lower temperatures and departs strongly from the critical point of pure water. At low pressures the CO 2 rich phase is the light phase, but at higher pressures this phase is the denser fluid phase. In a natural system of H 2 O-CO 2 complete miscibility will not exist below 265 degrees C; at higher temperatures a completely mixed super-critical fluid may exist, but at lower temperatures this fluid will segregate into two fluid phases.