riser reactor

riser reactor
The cracking portion of the FCC process, essentially a hundred foot tall vertical pipe. Oil, hot catalyst, and steam are injected continuously into the bottom of the riser, and the reaction occurs as the mixture rises to the top. Residence times in risers are typically one to two seconds. Risers are one of a general class of transport reactors, where reactions occur in dilute phase as the feed mixtures pass through a pipe.

Petroleum refining glossary. 2013.

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