4.1.2. Radial-flow tubular reactor
Radial-flow reactors have been used widely for different reaction
systems due to various advantages such lower pressure drop
and higher yield [129–131]. Radial-flow pattern has also been used
in a tubular fixed bed reactor for naphtha reforming process [132].
As shown in Fig. 7 this reactor consists of three concentric tubes.
The reaction takes place in the middle tube, which is packed by
catalyst. The outer annulus is filled by the naphtha feed, which is
distributed uniformly over the packed bed, while the inner annulus
is used as a collector to collect the products. It should be noticed
that the flow in the outer and inner annulus is in axial direction,
but the flow pattern in the bed of catalytic particle is radial.
Membrane concept can also be assisted in the radial-flow tubular
reactors to improve the performance of the catalytic naphtha
reforming process. In this reactor configuration, the naphtha feed
flows radially while the sweeping gas could flow in radial or axial
direction [117,133,134]. Fig. 8 shows the radial-flow tubular membrane
reactor in which the naphtha feed flows radially through the
packed bed, whereas the sweeping gas flows axially in the gaps
(shell side).
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