乙酸异戊酯＋异戊醇和乙酸异戊酯＋正己醇体系汽液平衡  

Isobaric vapor-liquid equilibrium for binary systems of isoamyl acetate + isoamyl alcohol and isoamyl acetate + n-hexanol at 50.00 and 101.33 kPa

作　　者：周峰[1] 陈长旭[1] 许春建[1] 

机构地区：[1]化学工程联合国家重点实验室,天津大学化工学院,天津300072

出　　处：《化工学报》2017年第2期560-566,共7页CIESC Journal

基　　金：化学工程联合国家重点实验室基金项目~~

摘　　要：在50.00和101.33 k Pa下,采用改进的Rose汽液平衡釜测量乙酸异戊酯+异戊醇和乙酸异戊酯+正己醇体系的汽液平衡数据。乙酸异戊酯+异戊醇在50.00 k Pa下形成最低共沸物。使用Herington法对汽液平衡数据进行热力学一次性检验,结果表明测得的汽液平衡数据符合热力学一致性。对实验数据使用NRTL、Wilson和UNIQUAC活度系数模型进行关联,回归获得相应的二元交互参数,模型计算的温度和组成与实验值相比均方差小于0.20 K和0.0050,表明3种模型的拟合结果与实验数据吻合较好。通过Wilson模型预测乙酸异戊酯+异戊醇体系在98.4 k Pa时共沸点消失。为化工数据库增添了内容,为乙酸异戊酯体系的工程设计和进一步深入研究奠定了基础。Isobaric vapor-liquid equilibrium data of the binary systems isoamyl acetate ＋ isoamyl alcohol and isoamyl acetate ＋ n-hexanol at 50.00 and 101.33 k Pa were measured using a vapor-liquid equilibrium still. The isoamyl acetate ＋ isoamyl alcohol system formed a minimum temperature azeotrope at 50.00 k Pa. The thermodynamic consistency of the VLE experimental data were checked by Herington method, and the results were satisfied with Gibbs-Duhem＇s thermodynamic consistency. The experimental measurements for the binary systems were correlated by nonrandom two-liquid（NRTL）, Wilson and universal quasichemical（UNIQUAC） activity coefficient models. Then, the corresponding parameters for the three models were obtained. Compared with the experimental data, the root-mean-square deviations of the boiling temperature and the vapor mole fraction calculated with the correlated parameters were less than 0.20 K and 0.0050, respectively. The calculated results showed that the experimental data agreed well with NRTL, Wilson and UNIQUAC models. Wilson activity coefficient model was used to predict the azeotropic phenomenon of isoamyl acetate ＋ isoamyl alcohol, which indicated that the azeotrope would disappear at 98.4 k Pa. This work provided important engineering data for chemical database and further study in the engineering design containing isoamyl acetate.

关 键 词：汽液平衡 乙酸异戊酯 异戊醇 正己醇 热力学模型 

分 类 号：O642.42[理学—物理化学]