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Measurement data and correlation of liquid-liquid equilibria for aqueous two-phase systems of HPP-Na2SO3-H2O

  • Zhengzhi ZHENG Yating LIU Peng CUI
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  • 1. School of Chemistry & Chemical Engineering, Anhui Key Laboratory of Controllable Chemistry Reaction & Material Chemical Engineering, Hefei University of Technology, Hefei, Anhui 230009, China; 2. School of Chemistry & Chemical Engineering, Anhui University, Hefei, Anhui 230601, China

Received date: 2017-08-25

  Revised date: 2017-11-13

  Online published: 2018-06-06

Abstract

The binodal and liquid?liquid equilibrium data of the 1,4-bis-(2-hydroxypropyl)-piperazine (HPP)–Na2SO3–H2O system at different temperatures were determined by cloud point method and phase component analysis method respectively. The binodal data were fitted by polynomial equation, empirical equations and effective excluded volume theory models respectively and the liquid?liquid equilibrium data were fitted by NRTL model. The results showed that empirical equations can provide better correlations for the binodal data than the polynomial equation and the effective excluded volume theory ones, and the NRTL model was suitable for the liquid?liquid equilibrium relationship of HPP–Na2SO3–H2O. Except the effective excluded volume theory model neglecting volume fraction f213, the parameters of equations and models were consistent with the actual calculation and engineering application requirements.

Cite this article

Zhengzhi ZHENG Yating LIU Peng CUI . Measurement data and correlation of liquid-liquid equilibria for aqueous two-phase systems of HPP-Na2SO3-H2O[J]. The Chinese Journal of Process Engineering, 2018 , 18(3) : 557 -562 . DOI: 10.12034/j.issn.1009-606X.217312

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