Measurement and Correlation of Vapor-Liquid Equilibrium of the 1,2-Epoxycyclohexane-Cyclohexanone Binary System at 101.3 kPa

• Published in: Chinese journal of chemical engineering Vol. 22; no. 3; pp. 355 - 359
• Main Author: 王训遒 庄新亮 蒋登高
• Format: Journal Article
• Language: English
• Published: Elsevier B.V 01.03.2014
• Subjects: 1,2-epoxycyclohexane; Byproducts; Chemical engineering; Consistency; Cyclohexanone; Hydrogen peroxide; Mathematical analysis; Mathematical models; NRTL equation; Rectification; vapor-liquid equilibrium; Wilson equation; 二元体系; 氧化环己烯; 汽液平衡数据; 测量; 热力学一致性; 环己酮; 环氧环己烷; 相平衡数据; Wilson equation; 1,2-epoxycyclohexane; NRTL equation; cyclohexanone; vapor-liquid equilibrium
• ISSN: 1004-9541; 2210-321X
• DOI: 10.1016/S1004-9541(14)60042-2

Many by-products are generated in the process of oxidizing cyclohexene to produce 1,2-epoxycyclohexane by hydrogen peroxide, including cyclohexanol, cyclohexanone, etc. To obtain high-purity 1,2-epoxycyclohexane, the by-products must be removed through rectification. Refining 1,2-epoxycyclohexane through rectification requires vapor-liquid equilibrium （VLE） data of the related system. Therefore, the VLE data of 1,2-epoxycyclohexane- cyclohexanone system were measured at 101.3 kPa using an improved EC-2 VLE still. The thermodynamic consistency of the data was then tested by Herington＇s method and the rigorous point-to-point method. The results obtained were exemplary. The VLE data were correlated by the Wilson and non-random two-liquid （NRTL） equations, using the error sum squares of the vapor composition as the objective function to obtain the model parameters. The difference between the calculated values and the experimental data is minor, indicating that the VLE data are suitable for engineering design.