Increased feed rate and/or unit conversion is one of the most common businessobjectives for a fluid catalytic cracking (FCC) unit revamp. The majority of FCCunits in the US has gone through various stages of modifications, and furtherincreases in feed rate and/or unit conversion often cause the existing units tobecome catalyst-circulation limited. De-bottlenecking catalyst circulation limitationusing conventional technology requires high costs in replacing catalyst transferlines and slide valves. In some cases, space availability and other limitations ofan existing FCC unit further complicate the situation. As a result, there is a clearneed for a cost effective revamp solution to de-bottleneck catalyst-circulationlimitations.
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