Dew point study in the vapor--liquid region of the methane--carbon dioxide system

Rice University used the elution technique to study the vapor-phase concentration along isotherms in the vapor--liquid region surrounding the vapor--solid region for the methane--carbon dioxide system at -65 to -184/sup 0/F, a temperature range that extends below methane's critical temperature. Pressure conditions ranged from the three-phase solid--liquid--vapor locus to the critical point or the vapor pressure of methane. Measurements were intensified near the critical temperature of methane. The isotherms obtained for the system below methane's critical temperature were consistently linear and differed markedly from the curvatures observed by other investigators.