Multistage FCC catalyst stripping

Details Multistage FCC catalyst stripping Multistage FCC catalyst stripping

1991-01-30

1991-10-22

McFarlane, Anthony

Mineral oils: processes and products

Chemical conversion of hydrocarbons

Cracking

208150, 208151, 208159, 208160, 208164, 585324, 585661, 502 41, C10G 1118

Patent

active

050593056

ABSTRACT:
Operational flexibility of a fluid catalytic cracking process is improved by directly cooling regenerated catalyst in an external catalyst cooler/stripper (ECCS). Regenerated catalyst withdrawn from the catalytic cracking unit regenerator is mixed with spent catalyst from the reactor stripper to effect desorption of cracked products from the spent catalyst at elevated temperature. The catalyst mixture is then contacted with an alkane-containing feedstream in a fluid bed maintained within a central section of the external catalyst cooler/stripper (ECCS). The mixture of spent and regenerated catalyst, cooled by the endothermic dehydrogenation of the alkanes, then flows downward through the ECCS to a lower section of the ECCS where the catalyst is countercurrently stripped with steam to remove remaining entrained hydrocarbons. Steam is withdrawn from an upper section of the steam stripping zone and bypassed around the dehydrogenation/stripping and mixing stages to avoid steam deactivation of the catalyst. The cooled, stripped catalyst mixture is then charged to the regenerator for further processing.

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