Chemistry Reference
In-Depth Information
3.6 Stirring
Since electrolytic reactions are typically
heterogeneous, stirring of an electrolytic
solution controls mass transport of substrate,
which greatly affects current efficiency and
product selectivity. Even if a solution is
vigorously stirred, the transport of the substrate
from bulk to the electrode surface is not always
enhanced. As shown in Figure 3.4 , circulation
of an electrolytic solution through a flow cell,
particularly a filter press type cell, is much
more efficient compared to a conventional
beaker type cell, hence the filter press type cell
is usually employed in industrial electrolysis.
3.7 Tracking of Reactant and
Product
Efficient conversion of substrate to desired
product is very important in organic synthesis.
In the case of constant current electrolysis,
discharge of solvent and/or supporting
electrolyte takes place simultaneously at a later
stage of the electrolysis. A theoretical amount of
charge passed is not always enough for
complete substrate conversion, hence
monitoring electrolysis (consumption of
starting substrate and amount of product)
should be carried out using TLC, GC, HPLC or
mass spectrometry (MS) to confirm substrate
conversion.
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