机构地区: 广东药学院药科学院
出 处: 《化学通报》 2010年第6期524-529,共6页
摘 要: 对苯酚+环己酮低温固液平衡体系,直接由相图和基本热力学数据,计算体系热力学性质。使用Gibbs-Duhem方程和四参量GE方程,在220.00~241.00K区间,计算了8个温度的两组元活度系数和GE方程,在241.00K,x2=0.5、GE=783.69J/mol,SE=97.11/(mol.K),HE=24186.69J/mol。241.00K相合熔点化合物的离解平衡ΔrGm=1982.93J/mol,ΔrHm=5753.241J/mol,ΔrSm=15.65J/(mol.K)。体系偏离于规则溶液模型。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 equation,the activity coefficient and G^E equation were calculated at eight temperatures for phenol + cyclohexanone system.At 241.00K,x2 = 0.5,G^E = 783.69J /mol,SE = 97.11J /(mol.K),HE = 24186.69J /mol.For the congruently addition compound dissociation equilibrium at 241K,ΔrGm = 1982.93J /mol,ΔrHm = 5753.241J /mol,ΔrSm = 15.65J /(mol.K).Phenol + cyclohexanone system can not be treated as regular solution,at x2 = 0.123 ~ 0.851 region ΔrHm ΔrSm were counted for the congruently melting addition compound dissociation reaction,which almost not change,so the compound is not stable in liquid phase.