Practical and theoretical consideration of flow-through microcalorimetry: determination of “thermal volume” and its flow rate dependence

Practical and theoretical consideration of flow-through microcalorimetry: determination of “thermal volume” and its flow rate dependence

The results have recently been reported of a preliminary study into the base catalysed hydrolysis of methyl paraben as a test and reference reaction for flow-through microcalorimeters. The values quoted for the rate constant and the molar enthalpy change are (3.15±0.11)×10−4s−1 and −50.5±4.3kJmol−1,...

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Bibliographic Details
Published in:Thermochimica acta Vol. 413; no. 1-2; pp. 193 - 199
Main Authors: O’Neill, M.A.A., Beezer, A.E., Vine, G.J., Kemp, R.B., Olomolaiye, D., Volpe, P.L.O., Oliveira, D.
Format: Journal Article
Language:English
Published: Amsterdam Elsevier B.V 08-04-2004
Elsevier Science
Subjects:
Analytical chemistry
Chemical and thermal methods
Chemistry
Exact sciences and technology
Flow microcalorimetry
Methyl paraben
Rate constant
Test and reference reaction
Flow microcalorimetry
Rate constant
Test and reference reaction
Methyl paraben
Experimental design
Flow through microcalorimetry
Theoretical study
Thermal analysis
Microcalorimetry
Experimental study
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Summary:The results have recently been reported of a preliminary study into the base catalysed hydrolysis of methyl paraben as a test and reference reaction for flow-through microcalorimeters. The values quoted for the rate constant and the molar enthalpy change are (3.15±0.11)×10−4s−1 and −50.5±4.3kJmol−1, respectively. The present paper explains the results of further studies of the methyl paraben reaction and also describes some practical and theoretical considerations of flow microcalorimetric experiments. It is shown that experimental design (sample and reference arrangements) has a significant impact upon the derived data. Particular attention is paid to the theoretical range of values for the molar enthalpy change and the rate constant, for reactions that could be studied successfully by flow calorimetry.
ISSN:0040-6031
1872-762X
DOI:10.1016/j.tca.2003.09.021