萘由水到水-叔丁醇混合溶剂的迁移热力学函数

Thermodynamic Functions of Transfer of Naphthalene from Water to Water- t-butyl Alcohol Solutions

通过溶解度法研究了萘从水到水-叔丁醇(TBA)混合溶剂中的标准迁移热力学性质.结果表明,标准迁移自由能随叔丁醇摩尔分数x(TBA)的增加表现出复杂的下降趋势.标准迁移熵和标准迁移焓呈现双峰变化迁移熵和迁移焓的双峰变化,表明系列H_2O-TBA混合溶剂的微观结构经历了从相对的有序到无序到再有序、再无序、再有序的变化过程;H_2O-TBA混合溶剂中除了在富水区存在着笼合物特殊结构外,在x(TBA)约为0.08处还存在着一相对有序的结构.

Standard thermodynamic functions of transfer of naphthalene from water to H2O-t-butyl alcohol (TBA) mixtures were determined from the solubility measurements at different temperatures. Standard free energies of transfer for naphthalene showed a complex decreasing tendency with the increasing of x(TBA), and the standard entropy and enthalpy of transfer exhibited a variation of double peak curves with x(TBA). This illustrated that the micro structures of series mixed solvents of H2O-TBA underwent a complicated process from relative order to relative disorder and then from relative disorder to relative order, and back to relative disorder again, then up to relative order. The results suggested that there was a relatively ordered structure near x(TBA) = 0. 08 in H2O-TBA solutions besides the existence of a clathrate structure in the water-rich region.