正庚烷-甲苯-三甘醇三元体系液-液相平衡数据的测定与关联

Determination and Correlation of Liquid-Liquid Equilibrium Data for the Ternary System of Toluene-n-Heptane-Triethylene Glycol

利用气相色谱法测定了常压下25℃、40℃和50℃时正庚烷-甲苯-三甘醇体系的液-液相平衡数据,采用峰面积归一化法定量,所得数据准确、可靠。用NRTL模型对所测数据进行了热力学关联,求出了相应的模型参数。对两种目标函数(摩尔分数和分配系数)的关联效果进行了比较。用该模型对本三元体系进行了预测,结果令人满意。

Liquid-liquid equilibrium (LLE) data of toluene-n-heptane-triethylene glycol of ternary system at 25℃,40℃ and 50℃ were determined at the atmospheric pressure by gas chromatography. The quantitative analysis was based on the normalization of peak area percent,and the accurate results having been acquired. The NRTL model was used to correlate the LLE data of system and obtained the model's parameters at 25℃, 40 ℃ and 50 ℃. In the correlation of ternary LLE data,two objective function (mole fraction and distribution constant)were used for purpose of comparison. The pridiction of the LLE data was done by using NRTL model. The agreement between caculated and experimental data was satisfactory.