, Volume 25, Issue 6, pp 341-348
Date: 11 Apr 2003

k L a determination: comparative study for a gas mass balance method

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The determination of k L a by a gas balance method coupled with sulphite oxidation is compared for three kinds of processes (stirred tank, bubble column and fixed-bed column reactors) with a gassing-in and with a classical chemical sulphite oxidation method. The mathematical relations required for the determination of the k L a value are detailed. In coalescing gas–liquid conditions, the values calculated by the three methods are shown to be comparable. The gas balance method is more rapid than either the steady-state gassing-in or the chemical sulphite reaction rate measurement methods. It is also well adapted for three-phase systems (gas–liquid–solid) in which the non-coalescing effects of sulphite solution are reduced by solid interferences.