物理化学学报 >> 1993, Vol. 9 >> Issue (05): 622-626.doi: 10.3866/PKU.WHXB19930510

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酚类在芳烃溶剂中的缔合溶液热力学

李培勋; 郑国康; 周效贤; 李松林   

  1. 兰州大学化学系，兰州 730000
  • 收稿日期:1992-03-18 修回日期:1992-11-02 发布日期:1993-10-15
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A Thermodynamic Study on the Self-association of Phenols in Aromatics by Freezing Point Depression

Li Pei-Xun; Zheng Guo-Kang; Zhou Xiao-Xian; Li Song-Lin   

  1. Department of Chemistry Lanzhou University, Lanzhou 730000
  • Received:1992-03-18 Revised:1992-11-02 Published:1993-10-15
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摘要： 用凝固点降低法测量了对甲酚、间甲酚、邻甲酚、2,4-二甲酚、2,6-二甲酚以及对甲酚+间甲酚、对甲酚+邻甲酚、间甲酚+邻甲酚、2,4-二甲酚+2,6-二甲酚的1:1摩尔比混合物等为溶质, 溶剂为苯或对二甲苯的活度系数, 用Wiehe-Bagley型的连续缔合模型对数据进行了处理, 得到了各种酚的自缔合常效K_A. 在同一溶剂中, K_A依下列顺序减小: 对甲酚>间甲酚>邻甲酚; 2,4-二甲酚>2,6-二甲酚. 各混合酚的表观K_A 介于两种纯酚的K_A之间.

关键词: 酚, 芳烃, 凝固点降低, 自缔合

Abstract: The activity coefficients of solvent for some phenols, i.e.p-cresol, m-cresol, o-cresol, 2,4-dimethyiphenol, 2,6-dimethylphenol and phenol mixtures p-cresol+m-cresol, p-cresol+o-cresol, m-cresol+o-cresol, 2,4-dimethylphenol+2,6-dimethylph-enol (1:1 mole ratio) in benzene and in p-xylene have been measured by freezing point depression. The data was treated with Wiehe-Bagley association model combining with a Hildebrand-Scatchard term to evaluate the association constants K_A of phenols. It is found that the K_A of phenols in each solvent follows the order: p-cresol>m-cresol>0-cresol; 2,4-dimethylphenol>2,6-dimethylphenol. The association constants of binary solute mixtures are all situated between the respective two pure components.

Key words: Phenols, Aromatics, Freezing point depression, Selfassociation