Process

A process for operating a plant facility during catalyst regeneration, comprising: providing a plant facility with a unit area operating within battery limits configured to receive a feed material; receiving the feed material into the battery limits and flowing the feed material within the unit area through a plurality of parallel flow paths in a plurality of reactor trains, wherein each reactor train comprises at least one reactor, and at least one reactor in each train is charged with a catalyst; isolating at least one, but not all, of the plurality of parallel flow paths to provide at least one isolated reactor train and remaining on-line reactor trains; regenerating the catalyst in the at least one reactor in the at least one isolated reactor train, wherein during regeneration the feed material flows through the parallel flow paths in the remaining on-line reactor trains, wherein the volume of feed material flowing through the plurality of parallel flow paths supplied from the battery limits and accepted for processing in the plant facility is approximately constant before and during isolation. The at least one reactor can be a microstructure/microchannel reactor which can be a Fischer-Tropsch reactor. A plant facility is also described.