Acta Phys. -Chim. Sin. ›› 1993, Vol. 9 ›› Issue (06): 776-787.doi: 10.3866/PKU.WHXB19930611

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Determination of Activity Coefficients of TBP-Contaning Systems and Study on Perturbation Theory

Cong Wei; Lu Jiu-Fang; Li Yi-Gui   

  1. Department of Chemical Engineering, Tsinghua Universtiy, Beijing 100084
  • Received:1992-04-13 Revised:1992-10-04 Published:1993-12-15
  • Contact: Cong Wei

Abstract: In this paper, the authors modify the technique for determining the activity coefficients by the method of head-space gas chromatography and improve the accuracy of the measurement. The activity coefficients of volatile components and densities of the solutions are measured for diluent-diluent, TBP-diluent and TBP-diluent-diluent systems and those TBP-containing systems with saturated water. The diluents used are n-C_6G_(14), n-C_7H_(16), n-C_8H_(18), C_6H_6, cy-C_6H_(12), CCl_4 and CHCl_3.
A simple activity coefficient model is derived on the basis of Pierott's theory with modified hard-sphere residual chemical potential and radial distribution function. Every kinds of forces between molecules are considered. The model is used to calculate the activity coefficients of TBP and diluents systems, From the molecular parameters regressed from two-component systems, the activity coefficients of three-component systems are calculated.

Key words: TBP, Diluent, Water, Activity coefficient, Perturbation theory