苯+六氟代苯相合熔点化合物及其固液平衡的热力学计算  

Thermodynamics Calculations of Benzene + Hexafluorobenzene Solid-Liquid Equilibrium and Its Congruently Addition Compound

作　　者：罗三来[1] 姚立新[2] 

机构地区：[1]广东药学院药科学院,广东广州510006 [2]广东药学院药物研究所,广东广州510006

出　　处：《四川师范大学学报（自然科学版）》2007年第4期492-496,共5页Journal of Sichuan Normal University（Natural Science）

基　　金：广东省科技重点攻关资助项目

摘　　要：使用Gibbs-Duhem方程和四参量GE方程,在272.00 K到278.00 K区间,计算了10个温度的两组元活度系数和GE方程,在272.00 K,x2=0.5,GE=1 184.70 J.mol-1,SE=21.10 J.mol-1.K-1,HE=6 921.11 J.mol-1,272.00 K相合熔点化合物的离解平衡△rGmθ=487.54 J.mol-1,△rHθm=21 364.11 J.mol-1,△rSmθ=76.75±0.01 J.mol-1.K-1.体系接近于规则溶液模型,在化合物存在相区离解反应的反应焓变和熵变均可视之为常量,液相区不会存在稳定的化合物.By using four parameter G^E equation and Gibbs-Duheme quation, the activity coefficient and G^E equation were calculated at ten different temperatures for benzene ＋ hexafluorobenzene system. At 272 K,x2 =0. 5 ,G^E = 1 184.70 J·mol^-1 , S^E =21.10 J·mol^-1·K^-1, H^E = 6 921.11 J·mol^-1. For the congruently addition compound dissociation equilibrium at 272K,△,H^θm= 487.54 J·mol^-1,△,H^θm =21 364.11 J·mol^-1 , △,S^θm =76.75 ＋0.01 J·mol^-1·K^-1. Benzene ＋ hexafluorobenzene system can be treated as regular solution, at the phase region contains congruently melting addition compound △,H^θm, △,S^θm for the congruently melting addition compound dissociation reaction almost not change, the congruently melting addition compound is not stable compound in liquid phase.

关 键 词：固液平衡 活度系数 超额吉布斯自由能 相合熔点化合物 苯+六氟代苯 

分 类 号：O642.42[理学—物理化学]