Shape of the Coexistence Curve in the Perfluoromethylcyclohexane-Carbon Tetrachloride System

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Abstract
Transition temperatures for the transition from the one‐phase to the two‐phase condition have been observed for the perfluoromethylcyclohexane‐carbon tetrachloride system. It is found that (Tc—T+0.001°)⅓ (where Tc, which is equal to 28.623°, is the observed critical temperature) is a linear function of the molecular fraction of carbon tetrachloride. As is indicated by the form of this function there appears to be a flat horizontal portion at the top of the coexistence curve, which extends from 0.5375 to 0.5625 volume fraction CCl4. It involves such a small temperature range as to be almost unobservable and the flat top is much less marked than in the cyclohexane‐aniline system. The melting point of perfluoromethylcyclohexane has been found to be —41.72°C.