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Physical mechanism of ultrasound-assisted synthesis of biodiesel / Abhishek Kalva in Industrial & engineering chemistry research, Vol. 48 N°1 (Janvier 2009) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 48 N°1 (Janvier 2009) . - P. 534-544 Titre : Physical mechanism of ultrasound-assisted synthesis of biodiesel Type de document : texte imprimé Auteurs : Abhishek Kalva, Editeur scientifique ; Thirugnanasambandam Sivasankar, Editeur scientifique ; Vijayanand S. Moholkar, Editeur scientifique Année de publication : 2009 Article en page(s) : P. 534-544 Note générale : Chemical engineering Langues : Anglais (eng) Mots-clés : Ultrasound-Assisted  Physical  Mechanism  Synthesis  of  Biodiesel Résumé : Acceleration of the transesterification reaction for synthesis of biodiesel by application of ultrasound is known. This paper tries to establish the mechanism of this enhancement by discriminating between physical and chemical effects of ultrasound. Experiments with different conditions have been coupled to a bubble dynamics model. It is revealed that influence of ultrasound on transesterification reaction is of purely physical nature. Formation of fine emulsion between oil and alcohol due to microturbulence generated by cavitation bubbles generates enormous interfacial area, which accelerates the reaction. For the power input used in the present experiments, the temperature peak reached in transient collapse of cavitation bubble in methanol is found to be too low to produce any radical species, which can induce transesterification reaction. The yield of the reaction is found to have an optimum with respect to alcohol to oil molar ratio. This result is attributed to the difference in intensity of microturbulence produced by cavitation bubbles in oil and methanol. En ligne : http://pubs.acs.org/doi/abs/10.1021/ie800269g [article] Physical mechanism of ultrasound-assisted synthesis of biodiesel [texte imprimé] / Abhishek Kalva, Editeur scientifique ; Thirugnanasambandam Sivasankar, Editeur scientifique ; Vijayanand S. Moholkar, Editeur scientifique . - 2009 . - P. 534-544. Chemical engineering Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 48 N°1 (Janvier 2009) . - P. 534-544 Mots-clés : Ultrasound-Assisted  Physical  Mechanism  Synthesis  of  Biodiesel Résumé : Acceleration of the transesterification reaction for synthesis of biodiesel by application of ultrasound is known. This paper tries to establish the mechanism of this enhancement by discriminating between physical and chemical effects of ultrasound. Experiments with different conditions have been coupled to a bubble dynamics model. It is revealed that influence of ultrasound on transesterification reaction is of purely physical nature. Formation of fine emulsion between oil and alcohol due to microturbulence generated by cavitation bubbles generates enormous interfacial area, which accelerates the reaction. For the power input used in the present experiments, the temperature peak reached in transient collapse of cavitation bubble in methanol is found to be too low to produce any radical species, which can induce transesterification reaction. The yield of the reaction is found to have an optimum with respect to alcohol to oil molar ratio. This result is attributed to the difference in intensity of microturbulence produced by cavitation bubbles in oil and methanol. En ligne : http://pubs.acs.org/doi/abs/10.1021/ie800269g