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Catalyst reformers come in three flavours: non-regenerative, semi-regenerative (SRR) and continuous catalyst regeneration (CCR). The earliest were non-regenerative, most of these are no longer in service. Today most catalytic reformers are SSR and the latset technology (around since 1971 UOP) are CRR.
Catalytic reformers use a solid catalyst (usually chlorinated Pt/alumina or Pt-Re/alumina) under high partial pressures of hydrogen at around 500degC to convert low octane straight run naphtha (usually heavy naphtha: C6-C11, b.p. 140-200degC) into high octane "reformate".
However, the catalyst deactivates over time due to coke build-up and loss of chlorine. A regeneration is required to restore catalyst activity and metals dispersion.
In the semi-regenerative (SRR) version, the reactors have to be taken off-line for regeneration every 6-24 months depending on rate of loss of activity.
In continuous catalyst regeneration (CRR) version a portion of the catalyst is contiuously transferred from the reactor system to a regenerator where it undergoes controlled coke combustion and oxychlorination to restore activity and metals dispersion - without the need to take the unit off-line.
CRR process units can be licenced from UOP or Axens.
Paul Diddams, Intercat
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