Determination of accurate specific heat capacities of liquids in a reaction calorimeter, by statistical design

  • Alozie D
  • Courtes P
  • Ha B
 et al. 
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Abstract

A method using statistical design is proposed to determine the measurement error of specific heat capacities (Cp) of liquids in any reaction calorimeter. This method only takes into account the experimental specific heat of the liquid, its volume and the reactors stirring rate.With the RC1e calorimeter used in this study, theCpmeasuredbyitsQuickCalmodewasoverestimatedby upto0.4 J 3 g1 3K1,whereas with itsRTCal mode,more accurate values ofCp ((0.2 J 3 g1 3K1) were obtained. The statistical model obtained based on the QuickCal mode predicts experimental conditions which improve the accuracy of Cp, and couldalsobeused to correct the value ofCp inthe rest of the experimental domain.Thecorrected values ofCpfor test solvents using this modelwere close to those cited in literature (e5%). As an application, the specific heat capacities at 25 Cof lesswell documented solventswere determined: anisole, ethyl- tertiobutylether, methyl-tetrahydrofurane, diethoxymethane, dimethyl-ethyleneurea and dimethylpropyleneurea.

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Authors

  • Diké Michel Alozie

  • Philippe Courtes

  • Benjamin Ha

  • Denis Prat

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