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US 4,784,748 AGranted
FCC unit combined with a circulating fluid bed combustor
AssigneeMobil Oil Corporation
InventorsAmos A. Avidan, Susan P. Donnelly, Frederick J. Krambeck
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Abstract
The invention combines two unit operations i.e. fluid catalytic cracking (FCC) and circulating fluid bed (CFB) boiler technologies. The circulating solid inventory of the CFB boiler is introduced to the bottom of a conventional FCC unit to supply the endothermic heat of reaction. A once-through FCC catalyst is introduced under high-temperature, short residence time conditions whereby improved yields are achieved through the reduction of coke made in the FCC unit.
Claims13
A process for the catalytic cracking of a hydrocarbon feedstock comprising:
- (a) feeding a hydrocarbon feedstock to a catalytic cracking zone;
- (b) introducing inert particles, from a circulating inventory of inert solids of a circulating fluid-bed combustor, into the reaction zone, at a temperature greater than about 950.degree. F. in the presence of the feedstock and a once-through zeolite catalyst;
- (c) catalytically cracking the feedstock to form cracked products;
- (d) separating the inert particles from the catalyst and the cracked product;
- and
- (e) returning the inert particles to the circulating fluid-bed combustor.
3 more elements
Dependencies are inferred from the claim text.