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利用原始UNIFAC模型对CO气相催化偶联合成草酸二乙酯产物中的各组分进行了基团划分，用实验测定的二元物系等温汽液平衡数据，关联了CH2O／HCOO基团相互作用参数，汽液平衡计算值与实验值比较偏差较大。为提高推算精度，对碳酸二乙酯进行新的基团划分，提出了UNIFAC新基团OCOO，重新关联了基团相互作用参数并进行了汽液平衡推算，结果令人满意。
The raw UNIFAC model was used to classify the constituents of CO produced by the CO catalyzed coupling of diethyl oxalate. The isothermal vapor-liquid equilibrium data of the binary system determined experimentally were used to correlate the CH2O / HCOO group interactions Parameters, vapor-liquid equilibrium calculated values and experimental values deviate more. In order to improve the accuracy of calculation and to classify new diethyl carbonate, the new UNIFAC group OCOO was proposed. The group interaction parameters were re-correlated and the vapor-liquid equilibrium was calculated. The result was satisfactory.