精馏法分离辛酸-癸酸体系的热力学分析  

Thermodynamic analysis for distillation separation of octanoic acid and decanoic acid

作　　者：涂传璞[1] 栗秀萍[1] 刘有智[1] 白梅[1] 李俊妮[1] 

机构地区：[1]中北大学山西省超重力化工工程技术研究中心,山西太原030051

出　　处：《化学工程》2012年第2期38-41,共4页Chemical Engineering(China)

基　　金：高等学校博士学科点专项科研基金(20060110003);山西省基础研究青年科技基金(2008021009-1);山西省高校开发项目(20091127)

摘　　要：常压精馏法分离辛酸-癸酸这一体系可能会使辛酸、癸酸在加热过程中发生分子间脱水缩合形成辛酸癸酸酐这一副反应。文中采用二参考流体法,ABW基团贡献法,Fedors基团加和法及Joback估算法估算了该反应体系的相关物质的基础数据及热力学数据,进行了系统的热力学分析。文章考察了反应焓变、Gibbs自由能与温度的变化关系,结果显示在精馏操作的温度范围内,反应焓变随温度的增大而减小且恒大于0,反应Gibbs自由能亦随温度的增大而减小且恒大于0。说明采用常规的精馏方法对该物系进行分离时,辛酸、癸酸分子间脱水缩合形成辛酸癸酸酐这一副反应无显著影响,为工业生产中精馏法分离该体系提供了一定的理论依据。The atmospheric distillation separation of octanoic acid and decanoic acid may be accompanied by intermolecular dehydration condensation and form sebacic acid anhydride in the heating process. By binary- reference fluid method, ABW group contribution method, Fedors groups addition method and Joback method, the basic data and thermodynamic data of the related substances in the system were calculated, and the detailed thermodynamic analysis of the side reaction was made. The relationships between reaction enthalpy change, Gibbs free energy and reaction temperature were studied. The results show that the reaction enthalpy change and Gibbs free energy both decrease with the increase of temperature, and both of them are constantly greater than zero in the range of heating temperature. The side reaction has no obvious impact on the conventional distillation of these two substances, which provides the theoretical basis for the distillation separation method of this system in industrial production.

关 键 词：辛酸 癸酸 辛酸癸酸酐 副反应 热力学分析 

分 类 号：TQ202[化学工程—有机化工]