摘要
用新型泵式沸点仪测定了在101.325 kPa下乙醚-甲醇、乙醚-正丁醇、甲醇-正丁醇3个二元系以及乙醚-甲醇-正丁醇三元系在不同液相组成时的沸点,并用间接法Tpx推算了3个二元系的汽相平衡组成y。3个二元体系活度系数分别用Wilson模型、NRTL模型、Margules模型和van Laar模型进行关联,用最小二乘法求出了它们的液相活度系数模型参数,同时,用这些模型参数来计算它们的汽相组成y。所得的液相活度系数来计算3个二元体系的超额吉布斯自由能函数GE/RT,并且研究的所有体系之间不存在共沸点。用3个二元系Wilson模型、NRTL模型、Margules模型和van Laar模型参数分别对所测的三元系数据进行关联,建立该系统汽液平衡的热力学模型并计算平衡时的汽相组成y和泡点温度。由面积积分法检验这些模型参数计算的3个二元体系相平衡数据得到很好的热力学一致性。
Under different liquid phase compositions,the isobaric vapor-liquid equilibrium（VLE） data of three binary systems（diethyl ether-methanol,diethyl ether-n-butanol and methanol-n-butanol） and one ternary system（diethyl ether-methanol-n-butanol） were determined at 101.325 kPa by using a novel pump-ebullionmeter.The vapor-phase compositions y of above three binary systems were calculated from T,p,x by the indirect method.The activity coefficients of the three binary systems were correlated separately with Wilson,NRTL,Margules and van Laar models,and the parameters of liquid phase activity coefficient models were calculated through the least square method,and then the obtained parameters were used to calculate the vapor-phase compositions y.The obtained activity coefficients were used to calculate the excess Gibbs function（GE/RT） of the three binary systems,and the results show that all the systems studied here do not exhibit azeotropes.Using the obtained parameters of Wilson,NRTL,Margules and van Laar models,the experimental VLE data of the ternary system were correlated to construct the thermodynamic model of VLE for the ternary system and to calculate its equilibrating vapor-phase composition y and the bubble point,respectively.The calculated bubble points agree with the experimental data well,and the thermodynamic consistency of the phase equilibrium data of the three binary systems calculated by those model parameters were checked with area test method and got satisfactory results.
出处
《高校化学工程学报》
EI
CAS
CSCD
北大核心
2011年第1期1-6,共6页
Journal of Chemical Engineering of Chinese Universities
基金
教育部科学技术研究重点项目(209056)
安徽省高等学校自然科学基金项目(ZD200902
KJ2009B036)
关键词
沸点仪
汽液平衡
乙醚
甲醇
正丁醇
pump-ebullionmeter
vapor-liquid equilibrium
diethyl ether
methanol
n-butanol
