Catalytic cracking of hydrocarbons
Patent
·
OSTI ID:5929081
This patent describes a fluid catalytic cracking process for nonhydrogenative cracking of hydrocarbons, which cracking process comprises: cofeeding active hot solid zeolite cracking catalyst and crackable hydrocarbon feed to a cracking zone; cracking the feed to hydrocarbon products while depositing coke, nickel and vanadium on the catalyst; disengaging the coked catalyst from the hydrocarbon products; passing the coked catalyst to a regeneration zone; passing an oxygen containing gas upwardly through the regeneration zone and at sufficient velocity to fluidize the catalyst contained therein; retaining the catalyst in the regeneration zone at a temperature and for a time sufficient to burn coke off the catalyst thereby heating and reactivating it and producing a flue gas comprising carbon oxides; returning the reactivated, heated catalyst to the cracking zone; concomitantly removing an amount of a circulating inventory of the catalyst from the process and replacing it with fresh makeup catalyst. The improvement comprises: adding to the circulating inventory of zeolite cracking catalyst separate particles of sponge coke having a selectivity for vanadium, K/sub v/, of at least about 10, the addition being effective to provide about 0.1 to about 10.0 weight percent of the sponge coke particles in the cracking zone.
- Assignee:
- Mobil Oil Corp., New York, NY
- Patent Number(s):
- US 4828680
- OSTI ID:
- 5929081
- Country of Publication:
- United States
- Language:
- English
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