液-液溶解度法与气-液色谱法研究溶剂-溶剂的相互作用

测量了角鲨烷(B)+邻苯二甲酸二丁酯(C)的溶解度相图, 应用HSFH二元系公式推算得相互作用参数Abc; 用气-液色谱测量了若干正构烷烃、环烷烃用作探测溶质(A)在(B+C)混合溶剂中的无限稀活度系数, 应用HSFH三元系公式推算得相互作用参数Abc, 两者符合热力学一致性。

Study of solvent-solvent interaction by liquid-liquid solubility and gas-liquid chromatography

The liquid-liquid solubility phase diagram of squalane (B) plus dibutyl-o-phthalate (C) has been measured, the consolute temperature of which was found to be 302.20K. This liquid-liquid coexistence curve was applied to calculate the interaction parameters Abc at various temperatures on the basis of the Hildebrand-Scatchard-Flory-Huggins binary system formula, together with the phase equilibrium condition (method I) or the critical point conditions (method II). It is shown that the value of Abc at critical temperature obtained by the one is consistent with the other. The infinite dilution activity coefficients at 313.15K were measured by gas-liquid chromatography for some aliphatic, alicyclic of C6 and C7 hydrocarbons in the mixtures of squalane (B) plus dibutyl-o-phthalate (C) over the entire composition range. The values of Abc calculated from the Hildebrand-Scatchard-Flory-Huggins ternary system formula have been reported. It can be shown that the values of Abc by different probe solutes are nearly a constant, the average value of which is consistent with the value by the coexistence curve reasonably. That is , the testing of thermodynamics consistency for our results is satisfied.