CORRELATION OF THE VOLUMETRIC PROPERTIES OF FLUORINATED ETHERS BY THEGROUP-CONTRIBUTION VOLUME-RATIO METHOD

(p, I: T) data obtained with simple volumometers are usually restricte d to a small range of temperatures below and above ambient temperature . The modified Tait equation has been very useful for extrapolating (p , V, T) data for individual liquids. The available volumetric data for fluorinated ethers is reviewed and is expressed as a correlation by u sing the Tait equation and the group-contribution volume-ratio method. Volume ratios obtained from this correlation used in combination with the densities of the liquid along the saturation boundary should prov ide the densities for a wide temperature and pressure range for the fl uorinated ethers, including some which may be useful as longterm repla cements for existing alternative refrigerants.