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78 3. Heterogeneous Processes and Reactor Analysis
Slurry Bubble Column Reactors (SBCR): This reactor is tubular (Figure 3.12). The liquid
is agitated by means of dispersed gas bubbles. Gas bubbles provide the momentum to suspend
the catalyst particles. The gas phase flows upward through the reactor at a constant rate. This
reactor could be of continuous type or of semibatch type. This type is used only in catalysis.
Agitated slurry r eactor (ASR): This is a mechanically agitated gas–liquid–solid reactor
(Figure 3.13). The liquid is agitated by a mechanical apparatus (impeller). The fine solid
particles are suspended in the liquid phase by means of agitation. Gas is sparged into the
liquid phase, entering at the bottom of the tank, normally just under the impeller. This reac-
tor can also be of continuous type or of semibatch type. This type is used only in catalysis.
3.3 TWO-PHASE AGITATED REACTORS
The analysis of this type of reactor requires a uniform composition of fluid phase through-
out the volume. While this is easily achieved by standard agitation devices for liquid–solid
This systems, i.e. impellers, it requires special design to be achie ed for gas–solid systems. v
type of reactor is basically used for laboratory e xperimentation.
G
L
L
G
Figure 3.12 The slurry bubble column reactor .
G
G
L
L
Figure 3.13 . The agitated slurry reactor
