Oxidation of Montan Waxes. Bubble
columns are used in a cascade when a narrow
residence-time distribution is required, for example,
to prevent or limit undesired consecutive
reactions. Reducing back-mixing (i.e., a narrow
residence-time distribution) is also useful when
reaction-engineering considerations dictate that
the gas must be fed to various points in the reactor
or when a liquid reactant must be degraded
to the greatest extent possible