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Key role of temperature monitoring in interpretation of microwave effect on transesterification and esterification reactions for biodiesel production

Mazubert, Alex and Taylor, Cameron and Aubin, Joelle and Poux, Martine Key role of temperature monitoring in interpretation of microwave effect on transesterification and esterification reactions for biodiesel production. (2014) Bioresource Technology, 161. 270-279. ISSN 0960-8524

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Official URL: https://doi.org/10.1016/j.biortech.2014.03.011

Abstract

Microwave effects have been quantified, comparing activation energies and pre-exponential factors to those obtained in a conventionally-heated reactor for biodiesel production from waste cooking oils via transesterification and esterification reactions. Several publications report an enhancement of biodiesel production using microwaves, however recent reviews highlight poor temperature measurements in microwave reactors give misleading reaction performances. Operating conditions have therefore been carefully chosen to investigate non-thermal microwave effects alone. Temperature is monitored by an optical fiber sensor, which is more accurate than infrared sensors. For the transesterification reaction, the activation energy is 37.1 kJ/mol (20.1–54.2 kJ/mol) in the microwave-heated reactor compared with 31.6 kJ/mol (14.6–48.7 kJ/mol) in the conventionally-heated reactor. For the esterification reaction, the activation energy is 45.4 kJ/mol (31.8–58.9 kJ/mol) for the microwave-heated reactor compared with 56.1 kJ/mol (55.7–56.4 kJ/mol) for conventionally-heated reactor. The results confirm the absence of non-thermal microwave effects for homogenous-catalyzed reactions.

Item Type:Article
HAL Id:hal-01891173
Audience (journal):International peer-reviewed journal
Uncontrolled Keywords:
Institution:French research institutions > Centre National de la Recherche Scientifique - CNRS (FRANCE)
Université de Toulouse > Institut National Polytechnique de Toulouse - INPT (FRANCE)
Université de Toulouse > Université Toulouse III - Paul Sabatier - UPS (FRANCE)
Other partners > University of Glasgow (UNITED KINGDOM)
Laboratory name:
Funders:
European Union - French Government - Région Midi-Pyrénées
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Deposited By: Loetitia MOYA
Deposited On:09 Oct 2018 10:35

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