Das Dampf‐Flüssigkeitsgleichgewicht des ternären Systems Ammoniak‐Kohlendioxid‐Wasser bei hohen Wassergehalten im Bereich zwischen 373 und 473 Kelvin

Abstract Experimental results for the vapor‐liquid equilibrium in the ternary system ammonia‐carbon dioxide‐water are reported for six temperatures between 373 and 473 Kelvin at total liquid concentrations from 4 to 30 mole percent of ammonia and up to 14 mole percent of carbon dioxide as well as for the binary gaseous electrolyte‐water mixtures at the same temperatures and liquid phase concentrations of up to one mole percent (CO 2 ) and 30 mole percent (NH 3 ) respectively. The newly measured data agree well with the very limited literature data for the binary as well as for the ternary systems. Caused by the low solubility of carbon dioxide in water, the experimental results for that binary are described applying Henry's law. For correlating the results for the ammonia‐water system. Henry's law has to be corrected by introducing activity coefficients. The model of Edwards et al. with recently published new parameters is used to compare the experimental results for the ternary with existing correlations. Deviations between predicted and measured total and partial pressures amount up to 60 percent, thus indicating that the model needs further improvement.