Authors:
P. Aggarwal Department of Chemistry and College of Pharmacy, University of Toledo, 43606 Toledo, OH USA

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D. Dollimore Department of Chemistry and College of Pharmacy, University of Toledo, 43606 Toledo, OH USA

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K. Alexander Department of Chemistry and College of Pharmacy, University of Toledo, 43606 Toledo, OH USA

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Abstract  

Ingredients used in the manufacture of perfumes can be investigated by thermogravimetry. In this study the evaporation of methyl benzoate was investigated using a simultaneous TG-DTA unit. A rising temperature method of thermal analysis was used for the study. The rate of evaporation of the ingredient was calculated from a simple plot of percentage mass lossvs. time. A derivative plot of the same was used to calculate the coefficient of evaporation in a controlled atmosphere and regulated air flow rate. In a series of programmed temperature runs on the TGDTA unit it was shown that the evaporation process is zero order, and that the evaporation coefficients at each temperature can be fitted into the Arrhenius equation. The energy of activation, Eact can be calculated from the slope of the line. It was found to be 47 kJ mol−1. This value was compared and shown to approach the enthalpy of vaporization as calculated using the Troutons or Clausius Clapeyron equation

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Journal of Thermal Analysis and Calorimetry
Language English
Size A4
Year of
Foundation
1969
Volumes
per Year
1
Issues
per Year
24
Founder Akadémiai Kiadó
Founder's
Address
H-1117 Budapest, Hungary 1516 Budapest, PO Box 245.
Publisher Akadémiai Kiadó
Springer Nature Switzerland AG
Publisher's
Address
H-1117 Budapest, Hungary 1516 Budapest, PO Box 245.
CH-6330 Cham, Switzerland Gewerbestrasse 11.
Responsible
Publisher
Chief Executive Officer, Akadémiai Kiadó
ISSN 1388-6150 (Print)
ISSN 1588-2926 (Online)

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