邻苯二酚体系汽液相平衡的测定及预测

在Ｅｉｌｌｓ平衡蒸馏釜中测定了水－苯酚、邻苯二酚－酚两组二元物系的汽液相平衡数据，采用单纯形法拟合求得了Ｗｉｌｓｏｎ方程和ＮＲＴＬ方程参数，用修正的ＵＮＩＦＡＣ模型预测了水－苯酚，邻苯二酚－对苯二酚物系在高真空条件下的汽液相平衡。预测结果与实测数据吻合较好。可将修正的ＵＮＩＦＡＣ模型直接用于邻苯二酚生产工艺技术的开发和分离装置的设计。

Measurement and Prediction of VLE of Catechol System

VLE data under high vacuum conditions were needed in process technology development of catechol system, in which water, phenol, catechol, hydroquinone were involved. Unfortunately, there were few reliable experiment data under high vacuum conditions, and the reliable data in the dilute condition (the mole fraction less than 0.05) are short. The latter is particular important for separation process design. So a modified UNIFAC model(proposed by Gmehling, 1993) was used to predict the phase behavior of catechol system. To test the reliability of this model, the VLE data of waterphenol and catecholhydroquinone binary systems were measured in a Eill's equilibrium distiller at 20 kPa (absolute pressure) and the interaction parameters of Wilson and NRTL model were fitted by simplex mothod. A comparison between the expermiental values and the correlated results by Wilson and NRTL confirms the reliability of the modified UNIFAC model. So this modified UNIFAC model can be satisfactorily used for process technology development of catechol production and design of separation plants.