Conductivity, calorimetry and phase diagram of the NaHSO4–KHSO4 system

Hamma-Cugny Hind; Søren Birk Rasmussen; J. Rogez; J. Alaoui-Elbelghiti; Kim Michael Eriksen; Rasmus Fehrmann

doi:10.1016/j.tca.2005.11.022

Conductivity, calorimetry and phase diagram of the NaHSO4–KHSO4 system

Authors:

Hind, Hamma-Cugny ;
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Department of Chemistry, Technical University of Denmark
Rasmussen, Søren Birk ;
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Department of Chemistry, Technical University of Denmark
Rogez, J. ;
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unknown
Alaoui-Elbelghiti, J. ;
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unknown
Eriksen, Kim Michael ;
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Department of Chemistry, Technical University of Denmark
Fehrmann, Rasmus
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0000-0003-0583-5958
Department of Chemistry, Technical University of Denmark

DOI:

10.1016/j.tca.2005.11.022

Abstract:

Physico-chemical properties of the binary system NaHSO4-KHSO4 were studied by calorimetry and conductivity, The enthalpy of mixing has been measured at 505 K in the full composition range and the phase diagram calculated. The phase diagram has also been constructed from phase transition temperatures obtained by conductivity for 10 different compositions and by differential thermal analysis. The phase diagram is of the simple eutectic type, where the eutectic is found to have the composition Χ(KHSO4)=0.44 (melting point ≈ 406 K). The conductivities in the liquid region have been fitted to polynomials of the form κ(X)=A(X)+B(X)(T-Tm)+C(X)(T-Tm)2, where Tm is the intermediate temperature of the measured temperature range and X, the mole fraction of KHSO4. The possible role of this binary system as a catalyst solvent is also discussed. (C) 2005 Elsevier B.V. All rights reserved.

Type:

Journal article

Language:

English

Published in:

Thermochimica Acta, 2006, Vol 440, Issue 2, p. 200-204

Keywords:

NaHSO4; KHSO4; Thermodynamic properties; Conductivity; Phase diagram

Main Research Area:

Science/technology

Publication Status:

Published

Review type:

Peer Review

Submission year:

2006

Scientific Level:

Scientific

ID:

8649163

Conductivity, calorimetry and phase diagram of the NaHSO<sub>4</sub>–KHSO<sub>4</sub> system

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