VAPOR LIQUID EQUILIBRIA OF DILUTE-SOLUTIONS OF PHENOLS IN CYCLOHEXANE - SELF-ASSOCIATION OF ORTHO-SUBSTITUTED PHENOLS

Vapour-liquid equilibria of dilute solutions of ortho-substituted phenols in cyclohexane have been studied. The isopiestic apparatus and the operational procedure have been described. Eight mono- and di-substituted ortho-alkylphenols have been studied at 298. 15 K using this technique; o-ethyl- and o-chlorophenol solutions have been studied at 298. 15 and 323. 15 K using the bubble-point method. The values of dimerization and polymerization constants are given. The practical osmotic coefficient of the solutions of diphenyl in cyclohexane at 298. 15 K (serving as reference in isopiestic measurements) has been determined by the bubble-point method, and the results represented by a polynomial.