水－正丙醇－正丁醇三元体系汽液平衡实验数据与计算

In the production of 1, 4-butanediol from acetylene, the water/n-propanol/n-butanol ternary system is commonly existed in its liquid waste. In order to recover them by separating process, the vapor-liquid equilibrium (VLE) data of the system is important. However, only limited VLE data of the above ternary system in a very narrow temperature range can be found nowadays in the literatures. In this study, the VLE data of the water/n-propanol/n-butanol ternary system were measured at 99.2kPa with the initial volume ratio between n-propanol and n-butanol is 1/4, 3/7, 2/3, 1/1 and 3/2, respectively, and the temperature is up to the vapor stratification point. Moreover, the measured VLE data was correlated by using an activity coefficient model established from the extended UNIQUAC equation, in which the binary interaction energy parameters between the three components were obtained through a simplex fitting method. The results show that, using the same interaction energy parameters obtained, the established model can correlate both the experimental data and the literature data well. It demonstrates that the experimental data are very consistent with the literature data, and the extended UNIQUAC model is reliable for the prediction of the VLE data of the water/n-propanol/n-butanol ternary system.