Chemical Research in Chinese Universities ›› 2004, Vol. 20 ›› Issue (2): 195-199.

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Measurement and Correlation of Equilibrium Data for Aqueous Two-phase System Ethanol+ Water+ K2HPO4

LIN Jin-qing, TAN Ping-hua, JIN Chun-ying, LI Ming-chun   

  1. College of Material Science and Engineering, Huaqiao University, Quanzhou 362011, P.R. China
  • Received:2003-11-22 Online:2004-04-24 Published:2011-08-06
  • Supported by:

    Supported by Naturd Science Foundation of Fujian Province(No.E0210022), Japan Science and Technology Corporation(JST).

Abstract: The isothermal solubility data of aqueous two-phase system ethanol+ water+ K2HPO4 were determined with the turbidity titration method at 303.2 K. The binodal curves were described by using the Mistry equation very well. An experimental procedure for measuring the liquid-liquid equilibrium data of the aqueous two-phase system was proposed, in which the concentrations of the coexisting phases were determined with the corresponding densities of the solution. The tie lines were satisfactorily described by using the Othmer Tobias and Bancroft equations.

Key words: Aqueous two-phase system, Solubility, Turbidity titration, LLE, Ethanol, K2HPO4