Measurements and Correlation of Liquid–Liquid Equilibria for the Ternary System Cyclohexanol + Water + Cyclohexyl Formate at 298.2–338.2 K

Abstract

Cyclohexanol is an important intermediate in production of adipic acid and e-caprolactam. On the industrial scale, cyclohexanol is produced by several methods that suffer from considerable drawbacks, such as a low conversion of the initial substance, low selectivity of the process, or explosion risks in the oxidation unit. To design a new process of indirect hydration of cyclohexene in the presence of formic acid, it is necessary to know the given system properties. In this paper, the data of liquid–liquid equilibrium (LLE) are presented for the system of cyclohexanol + water + cyclohexyl formate under atmospheric pressure and within a temperature range from 298.2 to 338.2 K. The experiments were conducted in a temperature-controlled glass cell and the received data were correlated with the nonrandom two-liquid (NRTL) and universal quasichemical equations in order to obtain binary interaction parameters describing LLE of the given system. The measured data accuracy was specified by the Bachman and Othmer–...