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Sonochemical efficiency dependence on liquid height and frequency in an improved sonochemical reactor.

De La Rochebrochard, Samuel; Suptil, Joël; Blais, Jean-François; Naffrechoux, Emmanuel (2012). Sonochemical efficiency dependence on liquid height and frequency in an improved sonochemical reactor. Ultrasonics Sonochemistry , vol. 19 , nº 2. p. 280-285. DOI: 10.1016/j.ultsonch.2011.07.009.

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Résumé

The aim of this study was to evaluate the effects of liquid height and frequency on sonochemical efficiency of a cup-horn sonoreactor. The selected frequencies (22, 371, 504 kHz) and liquid height (29-348 mm) were applied while measuring acoustic yield, I3- formation rate and the resulting sonochemical efficiency. The frequency effect was shown to be coupled to liquid height effect. Indeed, acoustic zones (i.e. Fresnel and Fraunhöfer zones), which limits depends on both transducer diameter and frequency, significantly determine the production of radicalar species quantified by I3- formation rate. An increase of ultrasonic frequency results in lower acoustic yield and higher sonochemical efficiency. Theoretical physical and chemical effects attributed to collapsing bubbles were considered. Sonochemical efficiencies obtained at 500 kHz were similar or higher than those at 371 kHz, depending on liquid height. The effect of reactor configuration was further investigated as an hypothesis to explain unsignificant effect of standing waves in our study. Therefore, the dependence of sonochemical efficiency with liquid height might be firstly attributed to reactor configuration prior to frequency effects.

Type de document: Article
Mots-clés libres: acoustic field; liquid height; reactor configuration; sonochemical efficiency; ultrasonic frequency
Centre: Centre Eau Terre Environnement
Date de dépôt: 19 oct. 2018 14:08
Dernière modification: 19 oct. 2018 14:08
URI: http://espace.inrs.ca/id/eprint/7241

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