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ＵＮＩＦＡＣ方程是化工设计中非常重要的方程，但它不能用于同分异构体物系，作者定义了几个新基因，使之可用于芳烃衍生物的同分异构体物系。采用取得了较好结果．由所得参数使用ＵＮＩＦＣ方程对上述物系的三元Ｓ—Ｌ—Ｅ进行预测，其结果与实验值非常接近．
The UNIFAC equation is a very important equation in chemical engineering, but it can not be used in isomeric systems. The authors have defined several new genes that make them available for the isomeric systems of aromatic derivatives. With better results achieved. The UNIFC equation was used to predict the ternary S-L-E of the above systems from the obtained parameters, and the results are in good agreement with the experimental data.