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Ultrasound-assisted transesterification of soybean oil using low power and high frequency and no external heating source

In this work, high frequency and low power ultrasound without external heating source and mechanical stirring in biodiesel production were studied. Transesterification of soybean oil with methanol and catalyzed by KOH was investigated using ultrasound equipment and ultrasonic transducer. The effect...

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Autores principales: Oliveira, Pâmella A., Baesso, Raphaela M., Morais, Gabriel C., Alvarenga, André V., Costa-Félix, Rodrigo P.B.
Formato: Online Artículo Texto
Lenguaje:English
Publicado: Elsevier 2021
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC8384912/
https://www.ncbi.nlm.nih.gov/pubmed/34419864
http://dx.doi.org/10.1016/j.ultsonch.2021.105709
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author Oliveira, Pâmella A.
Baesso, Raphaela M.
Morais, Gabriel C.
Alvarenga, André V.
Costa-Félix, Rodrigo P.B.
author_facet Oliveira, Pâmella A.
Baesso, Raphaela M.
Morais, Gabriel C.
Alvarenga, André V.
Costa-Félix, Rodrigo P.B.
author_sort Oliveira, Pâmella A.
collection PubMed
description In this work, high frequency and low power ultrasound without external heating source and mechanical stirring in biodiesel production were studied. Transesterification of soybean oil with methanol and catalyzed by KOH was investigated using ultrasound equipment and ultrasonic transducer. The effect of ultrasonic output power (3 W–9 W), ultrasonic frequency (1 MHz and 3 MHz), and alcohol to oil molar ratio (6:1 and 8:1) have been investigated. The increase in ultrasonic power provided higher conversion rates. In addition, higher conversion rates were obtained by increasing the ultrasonic frequency from 1 MHz to 3 MHz (48.7% to 79.5%) for the same reaction time. Results also indicate that the speed of sound can be used to evaluate the produced biodiesel qualitatively. Further, the ultrasound system presented electric consumption (46.2 W∙h) four times lower than achieved using the conventional method (211.7 W∙h and 212.3 W∙h). Thus, biodiesel production using low power ultrasound in the MHz frequency range is a promising technology that could contribute to biodiesel production processes.
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spelling pubmed-83849122021-08-30 Ultrasound-assisted transesterification of soybean oil using low power and high frequency and no external heating source Oliveira, Pâmella A. Baesso, Raphaela M. Morais, Gabriel C. Alvarenga, André V. Costa-Félix, Rodrigo P.B. Ultrason Sonochem Ultrasonics Sonochemistry in Latin America In this work, high frequency and low power ultrasound without external heating source and mechanical stirring in biodiesel production were studied. Transesterification of soybean oil with methanol and catalyzed by KOH was investigated using ultrasound equipment and ultrasonic transducer. The effect of ultrasonic output power (3 W–9 W), ultrasonic frequency (1 MHz and 3 MHz), and alcohol to oil molar ratio (6:1 and 8:1) have been investigated. The increase in ultrasonic power provided higher conversion rates. In addition, higher conversion rates were obtained by increasing the ultrasonic frequency from 1 MHz to 3 MHz (48.7% to 79.5%) for the same reaction time. Results also indicate that the speed of sound can be used to evaluate the produced biodiesel qualitatively. Further, the ultrasound system presented electric consumption (46.2 W∙h) four times lower than achieved using the conventional method (211.7 W∙h and 212.3 W∙h). Thus, biodiesel production using low power ultrasound in the MHz frequency range is a promising technology that could contribute to biodiesel production processes. Elsevier 2021-08-19 /pmc/articles/PMC8384912/ /pubmed/34419864 http://dx.doi.org/10.1016/j.ultsonch.2021.105709 Text en © 2021 The Author(s) https://creativecommons.org/licenses/by-nc-nd/4.0/This is an open access article under the CC BY-NC-ND license (http://creativecommons.org/licenses/by-nc-nd/4.0/).
spellingShingle Ultrasonics Sonochemistry in Latin America
Oliveira, Pâmella A.
Baesso, Raphaela M.
Morais, Gabriel C.
Alvarenga, André V.
Costa-Félix, Rodrigo P.B.
Ultrasound-assisted transesterification of soybean oil using low power and high frequency and no external heating source
title Ultrasound-assisted transesterification of soybean oil using low power and high frequency and no external heating source
title_full Ultrasound-assisted transesterification of soybean oil using low power and high frequency and no external heating source
title_fullStr Ultrasound-assisted transesterification of soybean oil using low power and high frequency and no external heating source
title_full_unstemmed Ultrasound-assisted transesterification of soybean oil using low power and high frequency and no external heating source
title_short Ultrasound-assisted transesterification of soybean oil using low power and high frequency and no external heating source
title_sort ultrasound-assisted transesterification of soybean oil using low power and high frequency and no external heating source
topic Ultrasonics Sonochemistry in Latin America
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC8384912/
https://www.ncbi.nlm.nih.gov/pubmed/34419864
http://dx.doi.org/10.1016/j.ultsonch.2021.105709
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