醋酸-水-醋酸丁酯体系等压气液平衡数据的测定与关联

用改进的Rose釜测定了101.33 kPa下醋酸水、醋酸醋酸丁酯及醋酸-水-醋酸丁酯(互溶区内)的等压气液相平衡数据。由计算得出的活度系数、逸度系数可知,醋酸的强缔合效应使得体系严重偏离理想行为。利用化学理论模型、Hayden-O’Conmell模型校正气相的非理想性及NBTL模型和UNIQUAC模型校正液相的非理想性用NRTL和UNIQUAC模型对醋酸-水和醋酸-醋酸丁酯的气液平衡数据进行了关联,得到相应的模型参数、温度偏差和气相组成偏差。利用二元NRTL体系模型参数预测三元体系气液平衡数据,计算值与实验值基本吻合。

Measurement and correlation of isobaric vapor-liquid equilibrium data for acetic acid-water-n-butyl acetate systems

Isobaric vapor-liquid equilibrium(VLE)data for acetic acid-water,acetic aeid-n-butvl acetate and acetic acid-water-n-butyl acetate systems were measured at 101.33 kPa by using an improved Rose still.The activity(’oelficient and the fugacitv coefficient showed that the associating effect of acetic acid caused the serious deviation from the ideal behavior.The nonidealitv of vapor phase was corrected bv the chemical theory model and the Hayden-O’Connell model,while the nonidealitv of liquid phase was corrected by NRTL and UNIQUAC models.NRTI.and UNIQUAC models were applied to correlate the vapor -liquid equilibrium data for acetic acid-water and acetic acid-n-butyl acetate systems,and the model parameters together with the deviation of temperature and molar fraction of vapor phase were obtained.The vapor-liquid equilibrium data of ternary system predicted from model parameters of the NRTL binary system, and then the calculated value was consistent with the experimental value.