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Citation: Li Pei-Xun, Zheng Guo-Kang, Zhou Xiao-Xian, Li Song-Lin. A Thermodynamic Study on the Self-association of Phenols in Aromatics by Freezing Point Depression[J]. Acta Physico-Chimica Sinica, ;1993, 9(05): 622-626. doi: 10.3866/PKU.WHXB19930510 shu

A Thermodynamic Study on the Self-association of Phenols in Aromatics by Freezing Point Depression

1.
Department of Chemistry Lanzhou University, Lanzhou 730000

Received Date: 18 March 1992
Available Online: 15 October 1993

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.
- Phenols; Aromatics; Freezing point depression; Selfassociation
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