Acta Phys. -Chim. Sin. ›› 2006, Vol. 22 ›› Issue (11): 1419-1422.doi: 10.3866/PKU.WHXB20061122

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Determination of Excess Enthalpies for Binary Systems of α-Pinene+p-Cymene and β-Pinene+p-Cymene

LIAO Dan-Kui;MENG Xue-Lin;WU Xiang-Hong;CHEN Xiao-Peng;ZHENG Dan-Xing;TONG Zhang-Fa   

  1. School of Chemistry and Chemical Engineering, Guangxi University, Nanning 530004, P. R. China; School of Chemical Engineering, Beijing University of Chemical Technology, Beijing 100029, P. R. China
  • Received:2006-04-24 Revised:2006-07-03 Published:2006-11-06
  • Contact: TONG Zhang-Fa E-mail:bioche@gxu.edu.cn; zhftong@sina.com

Abstract: The excess enthalpies of α-pinene+p-cymene and β-pinene+p-cymene binary systems were determined at 298.15 K, 308.15 K and 318.15 K and at atmospheric pressure by using a Calvet microcalorimeter (BT2.15). The experimental excess enthalpy data were correlated with Redlich-Kister equation and the standard deviations were all very small. It was found that all the excess enthalpies of these two binary systems were positive in the range of the experimental concentrations and reach their maxima when the mole concentration x1 was about 0.5. The excess enthalpies were larger at the higher mixing temperatures. At the same temperatures, the excess enthalpies of α-pinene+p-cymene system were larger than that of β-pinene+p-cymene.

Key words: α-Pinene, β-Pinene, p-Cymene, Excess enthalpy, Microcalorimeter