The imidazole catalysed hydrolysis of triacetin: a medium term chemical calibrant for isothermal microcalorimeters

Willson, Richard J. and Beezer, Anthony E. and Hills, Andrew K. and Mitchell, John C. (1999) The imidazole catalysed hydrolysis of triacetin: a medium term chemical calibrant for isothermal microcalorimeters. Thermochimica Acta, 325 (2). pp. 125-132. ISSN 0040-6031. (The full text of this publication is not currently available from this repository. You may be able to access a copy if URLs are provided)

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This paper reports an isothermal microcalorimetric study of the imidazole catalysed hydrolysis of triacetin as an example of a solution phase medium term reaction. The results of this study are then discussed in context of its potential as a quantitative chemical calibrant for calorimeters, especially isothermal microcalorimeters. It will be also shown that chemical calibrants can be important for the determination of the stability of the calorimetric signal itself and hence to the consideration of location and set-up of the calorimeter The imidazole catalysed triacetin hydrolysis reaction was studied in the calorimeter over a period of up to 50 days at 298.15 K and at pH 7.09. We have determined that, under these conditions, this reaction is second order with a rate constant of 8.64 x 10(-4) +/- 1.5 x 10(-5) dm(3) mol(-1) s(-1) and an associated change in enthalpy of -95.2 +/- 1.6 kJ mol(-1). The data analysis for this reaction was performed using a new mathematical approach for the calculation of kinetic and thermodynamic parameters from calorimetric data.

Item Type: Article
Uncontrolled keywords: isothermal microcalorimetry; reaction order; triacetin; kinetics; thermodynamics
Subjects: Q Science > QD Chemistry
Q Science > QC Physics
Divisions: Faculties > Science Technology and Medical Studies > School of Physical Sciences
Depositing User: F.D. Zabet
Date Deposited: 16 Mar 2009 15:12
Last Modified: 06 May 2014 09:10
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