The oxidation of cyclohexene by hydrogen peroxide to produce 1,2-epoxycyclohexane results in some byproducts. Meanwhile, unreacted cyclohexene still remains in solution. The byproducts and cyclohexene must be removed to get high purity of 1,2-epoxycyclohexane. Vapor-liquid equilibrium (VLE) data of the cyclohexene(1)-1,2-epoxycyclohexane(2)-cyclohexanone(3) ternary system was studied at 101.33 kPa by an improved EC-2 VLE reactor. The VLE data was predicted by Wilson equation of three corresponding binary system. Meanwhile, the VLE experimental data was correlated with Wilson equation. The error sum squares of the vapor composition were used as the objective function to get the model parameters. Variations between the values from the predictive value, theoretical calculation and the experimental data are negligible, which indicates that the experiment data are suitable for engineering design.%H2O2氧化环己烯制备环氧环己烷时会产生环己酮等副产物，同时还有未反应完的环己烯。为了获得较纯的环氧环己烷需采用精馏将副产物和环己烯分离出来，精馏提纯需要相关体系的汽液平衡数据，因此采用改进的EC-2汽液平衡釜测定常压(101.33kPa)下环己烯-环氧环己烷-环己酮三元体系汽液平衡数据。利用二元系汽液平衡数据拟合得到的 Wilson方程配偶参数预测该三元体系的汽液平衡数据，并以汽相组成的误差平方和作为目标函数，用Wilson方程关联实验数据，结果表明预测值及关联值与实验值偏差较小，可满足工程上分离设计的需要。
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