Chemistry: physical processes – Physical processes – Crystallization
Patent
1974-12-18
1976-05-25
Richman, Barry S.
Chemistry: physical processes
Physical processes
Crystallization
23288S, 208164, 252417, C10G 1118, B01J 808
Patent
active
039589536
ABSTRACT:
Regeneration of spent catalyst contaminated by a carbonaceous deposit is conducted by contacting the spent catalyst with a hot flue gas emanating from a first dense phase regeneration zone. The heated spent catalyst is then contacted countercurrently with an oxygen-containing gas in the first dense phase regeneration zone to produce partially regenerated catalyst which is subsequently contacted concurrently with an oxygen-containing gas in a second dense phase regeneration zone. The regenerator includes a standpipe section disposed within the regeneration vessel in concentric relation to the vertical axis thereof with a cylindrical baffle disposed around an upper portion of the standpipe section. The baffle has at least one orifice at its lower portion for direct passage of catalyst from the fluidized bed into the annular zone between the baffle and the standpipe. The catalyst inlet means to the regenerator is positioned at a spaced distance above the standpipe, whereby ctalyst is introduced above the fluidized bed.
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Exxon Research and Engineering Company
Gibbons Marthe L.
Richman Barry S.
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