【作者】 孙诚；

【导师】 薛荣书；

【作者基本信息】 重庆大学 ， 化学工程， 2008， 硕士

【摘要】 本文首先介绍了在解决相平衡过程中状态方程法和活度系数法各自的优缺点及其发展状况。回顾了UNIQUAC模型的发展历程,并采用Extended -UNIQUAC模型对本文的实验数据进行了回归,本文选取了水(1)/乙酸(2)、甲醇(1)/水(2)、水(1)/甲酸(2)、乙醇(1)/水(2)、四氢呋喃(1)/环己烷(2)等5个二元体系进行了汽液平衡数据的测定,对它们进行了热力学一致性检验,作出了部分相图;并将这些汽液平衡数据用于UNIQUAC相互作用参数的回归,模型计算值与测量值的平均偏差为0.00619,最大偏差为0.01157。又用Extended -UNIQUAC模型对7组三元体系汽液平衡数据进行回归,得出了相应的相互作用参数以及组分的汽相组成平均偏差和总的平均偏差,结果表明对三元体系的关联结果偏差较小。本文分别利用Extended -UNIQUAC、NRTL和WILSON模型对90个二元体系(共计1703个实验点)的汽相组成、泡点温度进行预测;通过这些预测并结合相关资料进行了二元体系汽液相平衡的研究。得出了活度系数关联式最优拟合频率,结果表明Extended -UNIQUAC模型的平均结果要占优,尤其对含水有机物和醇类的体系结果令人满意。在化学反应工程,分离工程,化工过程研究,开发和设计当中具有极强的实用价值。更多还原

【Abstract】 In this paper, the merits and flaws and the development status of equation of state model and activity coefficient model used in solving the process of phase equilibria are introduced at first. The development history of UNIQUAC model is recalled in the paper, and Extended -UNIQUAC model is used to regress the experimental data of this work. The vapor-liquid phase equilibrium data of five binary systems include methanol/water, water/formicacid, ethanol/water, tetrahydrofuran/cyclohexane, water/aceticacid have been measured in this paper, and the thermodynamic consistency test have been made. And those binary vapor-liquid equilibrium data were applied to the regression of UNIQUAC interaction parameters. The average deviation between the model calculated and measured values is 0.00619, the maximum deviation is 0.01157.Also seven ternary system VLE data have been regressed by Extended -UNIQUAC model and the corresponding interaction parameters have been gotten, as well as the average deviation of the vapour phase and the average deviation of the genental, the results show that the deviation of Correlation results for ternary system is small. In this work, Extended -UNIQUAC, NRTL and WILSON model have been applied to prodict the composition of the vapor phase, the bubble point temperature of vapor-liquid equilibria for 90 binary systems(1703 experimental data) .with the forecast and related informations,vapor-liquid binary system balance have been studied. Also the optimum fitting frequencies for activity coefficient of correlation have been gotten, results show that the Extended -UNIQUAC model is superior in the average results, especial for the aqueous-organic system and alcohols results are well. It is is highly practical value in the chemical reaction engineering, separation engineering, chemical process research, development and design.更多还原