采用汽液双循环相平衡仪测定了101.33 kPa下苯-噻吩、苯-二甲基亚砜及苯-噻吩-二甲基亚砜的等压汽液相平衡数据.两组二元体系实验数据均通过了Herington面积法的热力学一致性检验,分别采用NRTL和UNIQUAC活度系数模型对二元体系实验数据进行热力学关联,得到了相应的模型参数,温度偏差和汽相组成偏差,关联结果表明两种模型均能较好的关联实验数据,其中UNIQUAC模型的关联结果稍优于NRTL.利用二元体系UNIQUAC模型参数预测三元体系汽液平衡数据,预测值与实验值相比,平均温度偏差1.37 K,汽相各组分平均绝对偏差均在3%以内,获得了较优的预测结果,从而为工业上苯-噻吩萃取精馏分离过程提供可靠的热力学基础数据.%Isobaric vapor-liquid equilibrium (VLE) data of the benzene-thiophene-dimethyl sulfoxide (DMSO) ternary system and two constituent binary systems of benzene-thiophene and benzene-DMSO were measured at 101.33 kPa.The experimental apparatus was an all-glass double recirculating equilibrium still. The experimental data of the binary systems were verified thermodynamically consistent by the Herington method. NRTL and UNIQUAC models were used for correlating and estimating the measured binary data. The estimated binary VLE results agreed well with the experimental data, and the UNIQUAC model was slightly better than NRTL. Therefore, the UNIQUAC model parameters of the binary systems were used to predict the ternary VLE data. The predicted ternary values are consistent with the experimental results. The average absolute deviation (AAD) of the predicted temperature is 1.37 K and the AAD of the vapor phase compositions is less than 3%, which shows satisfactory prediction for this ternary system.
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