Sonochemical reactors: Important design and scale up considerations with a special emphasis on heterogeneous systems

Gogate, Parag R.; Sutkar, Vinayak S.; Pandit, Aniruddha B.

doi:10.1016/j.cej.2010.11.069

Cited by 479 publications

(234 citation statements)

References 82 publications

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“…Despite the extensive research at laboratory scale, a limited number of sonochemical reactors have been built on a full-scale for industrial applications, mainly due to [10,11]: (i) the lack of straightforward theory to determine the location and the cavitation collapse rate as a function of operating and reactor design properties, (ii) the very high degree of uncertainty when scaling up the existing information on sonochemical processes in laboratory conditions, (iii) large range of spatial and temporal scales involved in ultrasonic cavitation and (iv) the existence of cavitation near the transducer's surface which causes energy dissipation patterns in the reactor which are difficult to predict.…”

Section: Introductionmentioning

confidence: 99%

Numerical simulation of the nonlinear ultrasonic pressure wave propagation in a cavitating bubbly liquid inside a sonochemical reactor

Doğan

Popov²

2016

Ultrasonics Sonochemistry

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Section: Introductionmentioning

confidence: 99%

Numerical simulation of the nonlinear ultrasonic pressure wave propagation in a cavitating bubbly liquid inside a sonochemical reactor

Doğan

Popov²

2016

Ultrasonics Sonochemistry

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“…The difficulty of tailoring both frequency and amplitude at a time, together with the directional sensitive effect of ultrasound and its non-uniform volumetric energy density, are the main drawbacks of ultrasound cavitation that may complicate its scale-up [21][22][23][24]. A highintensity, bulk and multi-frequency type of excitation would be the ideal acoustic wave.…”

Section: Introductionmentioning

confidence: 99%

Shock-induced cavitation as a way of accelerating phenol oxidation in aqueous media

Dutilleul

Partaloglu

Costa

et al. 2017

Chemical Engineering and Processing: Process Intensification

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Graphical Abstract2 Highlights  Cavitation induced by the impact of a solid piston on liquid surface  Shock-waves of several bars amplitude exciting a wide frequency range  Phenol degradation initiated at ambient temperature and absence of oxidants  High phenol mineralization extents measured upon H2O2 addition  Accelerated active radical formation in the presence of shock-induced cavitation AbstractShock-induced cavitation phenomena, resulting from the propagation of the trail of shockwaves generated upon the impact of a solid piston on a liquid surface, was used as an innovative way of intensifying the oxidation of phenol in aqueous media. The amount of energy communicated by the impact was found to be proportional to the impact height, and was directly related to the maximal pressure attained, i.e. in the order of several tens of bars. This peak was followed by a rarefaction period that results in the origination of several cavitation phenomena, which continued upon piston rebound and further shock-wave generation and propagation. The multi-frequency nature of shock-induced cavitation, capable of exciting a wide range of frequencies between 1 kHz and 100 kHz, was confirmed by means of wavelet analysis. Under shock-induced cavitation conditions, phenol degradation was found to be possible even in the absence of any oxidizing agent. High extents of mineralization, i.e. 45.3 and 56.2% TOC elimination, 50 mg/L solution, neutral pH, were obtained in the presence of H2O2 (aprox. 10% vol.), pointing to an acceleration of the oxidation reaction based in a faster and more efficient creation of radical species.

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“…Moreover, reactor design can be an essential ingredient for efficiency and scaling up considerations. 87 All in all, there is little or no doubt that ultrasoundbased methodologies will add further stimuli to basic science and technology.…”

Section: Perspective and Concluding Remarksmentioning

confidence: 99%

Harnessing mechanochemical effects with ultrasound-induced reactions

Cravotto

Cintas

2012

Chem. Sci.

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Chemical reactions may experience numerous and varied effects under the influence of ultrasound. This soft radiation, often viewed as a lab trick, induces and improves both physical and chemical transformations by means of efficient agitation, dissolution, mass and heat transfers, and reagents sonolysis, which all arise from the cavitational collapse. An empirical rationale that distinguishes between true chemical effects and mechanical ones, especially in heterogeneous reactions, was introduced more than two decades ago and has been a useful guidance on reporting sonochemical mechanisms. Recent studies have witnessed a truly remarkable data set that boosts sonochemistry over the wall of applied science. This perspective highlights the importance of the so-called false sonochemistry-closely related to mechanochemistry-in modern synthesis, thus illustrating the advantages of using pressure waves in chemistry. Emphasis is put on green transformations, mild polymerization reactions and the selective cleavage of functionalized polymers, which may have an effective impact in process chemistry and represent a realistic option in industry.

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Sonochemical reactors: Important design and scale up considerations with a special emphasis on heterogeneous systems

Cited by 479 publications

References 82 publications

Numerical simulation of the nonlinear ultrasonic pressure wave propagation in a cavitating bubbly liquid inside a sonochemical reactor

Numerical simulation of the nonlinear ultrasonic pressure wave propagation in a cavitating bubbly liquid inside a sonochemical reactor

Shock-induced cavitation as a way of accelerating phenol oxidation in aqueous media

Harnessing mechanochemical effects with ultrasound-induced reactions

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