高等学校化学学报 ›› 1986, Vol. 7 ›› Issue (9): 831.

• 研究论文 • 上一篇    下一篇

多元系相界上的活度—一种活度计算的递推公式

方正   

  1. 中南工业大学化学系
  • 收稿日期:1985-05-10 出版日期:1986-09-24 发布日期:1986-09-24

Activities on Phase Boundaries in Multicomponent Systems—A Recursion Formula for Calculation of Activities

Fang Zheng   

  1. Central South University of Technology Changsha
  • Received:1985-05-10 Online:1986-09-24 Published:1986-09-24

摘要: 据等温等压多相平衡Gibbs能最小原理并应用Lagrange未定乘数法导出多元系组元化学位和平衡成分关系式。由此给出三元系两相共存区边界上由一已知组元活度计算它组元活度的解析递推式。该结果被推广到K元K-1相平衡共存区相界。计算结果与实验值符合得较好。

Abstract: On the principle of the Gibbs energy being minimum in phase equilibria at constant temperature and pressure,the relationships between chemical potential and compositions on phase boundaries of multicomponent systems are derived by using Lagrange's method of indeterminate coefficients.The analytical solutions for two coexisting phase fields of ternary systems are given It is shown that analytical solutions may overcome the difficulties inherent in the older graphical Gibbs-Duhem integration techniques.The utility of this thermodynamic method developed in the present study is demonstrated for thesystems C6H6-H3O-C2H5OHand H2O-C3H5OH-CCl4.The calculated values agree fairly well with the experimental data.The solutions presented have been extended to systems of k components and k-1 phases.

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