Phase Equilibrium Studies in the Quaternary Lactic Acid–N-Butanol–Water–N-Butyl Lactate System with Chemical Reaction

• Main Authors: Chen, cheng han, 陳正翰
• Other Authors: Cheng, Shueh-Hen
• Format: Others
• Language: zh-TW
• Published: 2010
• Online Access: http://ndltd.ncl.edu.tw/handle/61421254652043955838

碩士 === 東海大學 === 化學工程與材料工程學系 === 98 === Reactive distillation can be an effective means for purification of crude lactic acid. It can be achieved by esterification of crude lactic acid with n-butanol, followed by hydrolysis of butyl lactate. In order to develop this reactive distillation process, measurement of phase equilibrium data and their regression are necessary and are the focus of this study. In this study, headspace chromatography method was employed to measure binary vapor-liquild equilibrium data of n-butanol/n-butyl lactate and water/n-butanol systems at 348.15K, and the experimental results passed the thermodynamic consistency test. Liquid-liquild equilibrium data were also taken for the ternary water/n-butanol/n-butyl lactate system. In addition, a dynamic recirculating cell was used to measure isobaric quaternary vapor-liquild equilibrium data of lactic acid/n-butanol/water/n-butyl lactate system, together with vapor- liquild-liquid equilibrium data for the water/n-butanol system. Based on the Maximum Likelihood Principle, data reduction was done using NRTL and UNIQUAC models. Four regression schemes were presented and compared in terms of model predictive accuracy. Six sets of binary interaction parameters, including non-randomness parameters, that best represent the measured data were found and can be used for process simulation and design purposes.