物理化学学报 >> 1985, Vol. 1 >> Issue (04): 301-303.doi: 10.3866/PKU.WHXB19850401

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部分互溶体系环己烷+甲醇的混合热

戴明; 赵健萍   

  1. 河南化学研究所溶液化学研究室
  • 收稿日期:1985-01-17 修回日期:1985-03-27 发布日期:1985-08-15

HEATS OF MIXING OF THE PARTIALLY MISCIBLE LIQUID SYSTEM CYCLOHEXANE+METHANOL

Dai Ming; Chao Jianping   

  1. Research Laboratory of Solution Chemistry, Henan Institute of Chemistry, Zheng Zhou
  • Received:1985-01-17 Revised:1985-03-27 Published:1985-08-15

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Abstract:

The molar excess enthalpies of cyclohexane+methanol were systematically measured with a Picker flow microcalorimeter operated in discontinuous mode at 298.15 303.15, 308.15, 313.15, 318.15 and 323.15 K. Our values are higher than the literature data. This work shows that the molar excess enthalpies increase with tem- perature, and the straight segments of the excess enthalpy curves in the mid become shorter with the increasing of temperature. At 323.15 K the sample becomes one of a miscible liquid system, and the position of themaximum value of molar excess enthalpies is at x=0.6. In addition, the calorimetric measurement can be used to determine the compositions of two immiscible phases for the binary mixture.