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Journal Articles Journal of Chemical Thermodynamics Year : 2013

Accurate DSC measurement of the phase transition temperature in the TBPB–water system

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Abstract

There is some disagreement in the literature on the phase transition temperatures of salt semi-clathrates, which melt incongruently due to the change of salt concentration in the liquid phase. By using differential scanning calorimetry (DSC), the phase transition temperatures of tetrabutylphosphonium bromide (TBPB) hydrates were investigated at 0.10 < wTBPB < 0.37 and atmospheric pressure. The freezing point of ice with the presence of NaCl was also studied as a reference. In this work, two DSC procedures were employed: dynamic and stepwise schemes, characterized by the maximum peak temperature Tpeak and inflection point temperature Tend, and final step temperature Tstep, respectively. The stepwise DSC scheme was validated by the measurement of the ice freezing point at wNaCl = 0.10, 0.15 and 0.18. For the dynamic scheme, we developed and tested a method to estimate the melting temperature of TBPB hydrates. This method, though having a higher uncertainty, was more efficient than the stepwise scheme. The phase transition temperatures of TBPB hydrates are presented with the accuracy of 0.1 K and compared with literature data.
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Dates and versions

hal-01179632 , version 1 (23-07-2015)

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Wei Lin, Didier Dalmazzone, Walter Fürst, Anthony Delahaye, Laurence Fournaison, et al.. Accurate DSC measurement of the phase transition temperature in the TBPB–water system. Journal of Chemical Thermodynamics, 2013, 61, pp.132-137. ⟨10.1016/j.jct.2013.02.005⟩. ⟨hal-01179632⟩
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