Acta Phys. -Chim. Sin. ›› 1993, Vol. 9 ›› Issue (05): 622-626.doi: 10.3866/PKU.WHXB19930510

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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
  • Contact: Zheng Guo-Kang

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