Modelling the thermal decomposition of 3 4 5-trihydroxybenzoic acid using ordinary least square regression

Mafra L. I., . and Granato D., . and Colman T. A. D., . and Alberti A., . and Nogueira A., . and Schnitzler E., . Modelling the thermal decomposition of 3 4 5-trihydroxybenzoic acid using ordinary least square regression. pp. 30-33. ISSN 2231-7546

Thermalgravimetric analysis and differential thermal analysis were employed to study the thermal behavior of gallic acid using regression models. Data were subjected to ordinary least square regression models and results showed that thermal decomposition occurred in three main steps with two endothermic peaks and two exothermic peaks due to oxidation process. The dehydration started at 74C in a single step until 107C. After that the anhydrous compound was stable until 210C when the decomposition of organic matter occurred in two consecutive steps. Regression models based on a first-order kinetic of gallic acid decomposition were proposed and equations were deemed statistically significant (p0.05) and explained suitably the phenomenon. Differential scanning calorimetry (DSC) allowed the determination of the enthalpy of the main events and the Flynn-Wall-Ozawa non-isothermal method was used to investigate the activation energy of decomposition process that was found to be 150.31 kJ.mol-1.

Full text available from: Official URL: http://www.ifrj.upm.edu.my/23%20(01)%202016/(5).pd...

Abstract

Thermalgravimetric analysis and differential thermal analysis were employed to study the thermal behavior of gallic acid using regression models. Data were subjected to ordinary least square regression models and results showed that thermal decomposition occurred in three main steps with two endothermic peaks and two exothermic peaks due to oxidation process. The dehydration started at 74C in a single step until 107C. After that the anhydrous compound was stable until 210C when the decomposition of organic matter occurred in two consecutive steps. Regression models based on a first-order kinetic of gallic acid decomposition were proposed and equations were deemed statistically significant (p0.05) and explained suitably the phenomenon. Differential scanning calorimetry (DSC) allowed the determination of the enthalpy of the main events and the Flynn-Wall-Ozawa non-isothermal method was used to investigate the activation energy of decomposition process that was found to be 150.31 kJ.mol-1.

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Item Type:	Article
AGROVOC Term:	Thermal decomposition
AGROVOC Term:	Phenolic compounds
AGROVOC Term:	Gallic acid
AGROVOC Term:	Oxidation
AGROVOC Term:	Organic matter
AGROVOC Term:	Calorimetry
AGROVOC Term:	Decomposition
Depositing User:	Ms. Suzila Mohamad Kasim
Last Modified:	24 Apr 2025 06:27
URI:	http://webagris.upm.edu.my/id/eprint/22417

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