Mineral oils: processes and products – Chemical conversion of hydrocarbons – Plural serial stages of chemical conversion
Patent
1977-01-17
1978-05-23
Gantz, Delbert E.
Mineral oils: processes and products
Chemical conversion of hydrocarbons
Plural serial stages of chemical conversion
208 78, 208113, 208120, 208164, 208254R, B01J 824, C10G 3702, C10G 1104
Patent
active
040909484
ABSTRACT:
An improvement in the fluid cracking process is obtained by contacting the hydrocarbon feed in a riser reaction zone first with a recycled coke-containing spent catalyst and then contacting the resultant mixture with freshly regenerated catalyst to produce the desired conversion of the hydrocarbon feed and a coke-containing spent catalyst, a portion of the spent catalyst being recycled without regeneration to the inlet of the reaction zone and the remainder being regenerated and returned to an intermediate point in the reaction zone. The recycled coke-containing spent catalyst has sufficient activity so that the highly reactive nitrogen and carbon residue containing hydrocarbon contaminants in the oil feed will deposit on the spent catalyst and thus minimize the deactivation of the freshly regenerated catalyst used in the subsequent cracking of the oil feed.
By contacting the oil feed first with the recycled spent catalyst, this invention allows the refiner to utilize the full activity and selectivity characteristics of the freshly regenerated catalyst in order to obtain higher yields of the desired products from the cracking operations.
REFERENCES:
patent: 2379159 (1945-06-01), Kanhofer
patent: 3186805 (1965-06-01), Gomory
patent: 3380911 (1968-04-01), Owen
patent: 3639228 (1972-02-01), Carr et al.
patent: 3679576 (1972-07-01), McDonald
patent: 3812029 (1974-05-01), Snyder
patent: 3888762 (1975-06-01), Gerhold
patent: 3997428 (1976-12-01), McKenna
Gantz Delbert E.
Schmitkons G. E.
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