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worldwide, and in 2010 24% of this adiponitrile
was manufactured by cathodic hydrocoupling
by whole production.
8.2.2 Electrosynthesis of Aromatic
Aldehydes
The electrochemical production of acetals of
aromatic aldehydes like anisaldehyde and
p
-tolualdehyde has been running for more than
30 years at BASF, as shown in
Eq. 8.3
[2].
Oxidation of the methyl group on aromatic
rings provides aromatic aldehydes, but ordinary
chemical methods using oxidants often cause
overoxidation, resulting in the formation of
carboxylic acids as a by-product. The
electrochemical oxidation of toluene derivatives
in methanol provides anodically stable
dimethylacetals, which are readily hydrolyzed
to form aldehydes and methanol. The recovered
methanol can be recycled for anodic
acetalization. This process is operated in the
capillary gap cell developed by BASF, as shown
in
Figure 6.26
[5].
(8.3)
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