C_9-DMP多元体系萃取蒸馏汽液平衡模型的研究

STUDY ON VAPOR-LIQUID EQUILIBRIA FOR EXTRACTIVE DISTILLATION OF C_9-DMP MULTICOMPONENT SYSTEM

用色谱法测定了C_9芳烃各组分在DMP(邻苯二甲酸二甲酯)中的α_((?)j),得出ln(γ(?)/γ(?))=A_1+B_1/T线性关系;根据Lennard-Jones分子位能函数模型提出由一个端值和纯组分的临界参数预测汽液平衡的方法;预测结果与C_9-DMP二元及三元体系的实测数据比较,汽相摩尔分率的总平均绝对偏差小于0.005。

Relative volatitiesα_(ij) of C_9-aromatic hydrocarbon system are determined by gas chromatography in the presence of a solvent DMP (Dimethyl-Phthalate) and a linear correlation, ln.(γ(?)/γ(?))=A_i+ Bj/T, is obtained by the Newton-Raphson method. A method based on Lennard-Jones molecular potential energy is developed to predict the vapor-liquid equilibria by one γ(?) and critical values of pure species. Comparing the predicted VLE results of C_9-DMP binary systems with the experimental data,the overall average absolute deviation |△(?)| at three different temperatures are less than 0.005.