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Figure 6.30 Chemoselective cathodic
reduction using parallel laminar flow in a
two-inlet microflow reactor. (a) Flow mode for
the selective reduction of benzaldehyde. (b)
Flow mode for the selective reduction of
1-chloro-3-methyl-2-butene
6.11 Electrolysis Under
Ultrasonication
The many benefits of ultrasound in chemical
processes are well known and have been
investigated in a variety of chemical fields, but
perhaps the most striking influence of
ultrasound concerns heterogeneous reaction
systems, particularly those with a solid-liquid
interface where particle size modification, the
modification of particle dispersion, the
enhancement of mass transport, the cleaning of
surfaces or the formation of fresh surfaces are
among the beneficial processes [79].
Since an electrochemical synthetic process is a
typical heterogeneous one in a solid
(electrode)-liquid (electrolytic solution)
interface, various effects of ultrasound,
particularly promotion of mass transport,
would be induced by ultrasonication. A major
contribution to mass transport is the micro-jet
stream resulting from the asymmetric collapse
of a cavitation bubble ( Figure 6.31 ) [80].
Suslick et al. reported that the velocity of the
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