Apparatus for spent catalyst treating for fluidized catalytic cr

Details Apparatus for spent catalyst treating for fluidized catalytic cr Apparatus for spent catalyst treating for fluidized catalytic cr

1986-01-30

1988-04-19

Richman, Barry S.

Chemical apparatus and process disinfecting, deodorizing, preser

Chemical reactor

Fluidized bed

208151, 422145, 422147, B01J 818

Patent

active

047388293

ABSTRACT:
Apparatus for increasing the overall efficiency of fluidized catalytic cracking (FCC) with crystalline zeolitic catalysts is disclosed. Separated or spent cracking catalyst after reaction with hydrocarbonaceous material is first stripped and then subjected to an additional period of time in the presence of steam in the dense phase before the catalyst is returned to a regenerator. In a preferred form the spent catalyst after normal steam stripping is subjected to an additional period from 1/2 to 30 minutes at elevated temperature. This time is from 6 to 900 times the reaction time of the catalyst and hydrocarbonaceous mixture in an FCC reactor riser pipe. Such additional contact time for steam to react with the spent catalyst and/or coke produces significant beneficial results in FCC performance. In a preferred form, the extended stripper/treating column is either adequately insulated, or the treating column is in heat exchange with the riser pipe, or both, or the column is enclosed within the regenerator so that combustion gases of burning coke and/or the hot bed of regenerating catalyst heat the column of spent catalyst and steam during their extended residence time in the column.

REFERENCES:
patent: 2391336 (1945-12-01), Ogorzaly
patent: 2463434 (1949-03-01), Shankland
patent: 3690841 (1972-09-01), Bunn et al.
patent: 3806324 (1974-04-01), MacLean et al.
patent: 4138219 (1979-02-01), Colvert et al.

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