ESTIMATION OF PRESSURE-TEMPERATURE CRITICAL LOCI OF CO2 BINARY-MIXTURES WITH METHYL-TERT-BUTYL ETHER, ETHYL-ACETATE, METHYL-ETHYL KETONE, DIOXANE AND DECANE

Pressure-temperature coordinates of critical points for binary mixture s of CO2 and five co-solvents are estimated using a peak-shape-sensiti ve flow-injection procedure. CO2 is pumped continuously under pressure control into a thermostated capillary tube which is restricted at its outlet and interfaced to a flame ionization detector. The co-solvent is injected into the capillary tube inlet at ambient temperature, wher e the CO2 is a liquid at the test pressures and transported to the the rmostated section of the capillary tube. The shape of the co-solvent p eak as it exits the capillary tube and enters the detector is dependen t on mass transport rates and phase behavior occurring earlier in the system. (C) 1997 Elsevier Science B.V.