Two stage catalytic cracking process

Details Two stage catalytic cracking process Two stage catalytic cracking process

1982-12-03

1984-03-13

Gantz, Delbert E.

Mineral oils: processes and products

Chemical conversion of hydrocarbons

Plural serial stages of chemical conversion

208 77, 208155, 208156, 208 97, 422142, 422144, 502 42, C10G 5102, B01J 826, B01J 828

Patent

active

044366132

ABSTRACT:
A two-stage cascade flow fluid catalytic cracking process capable of converting high molecular weight hydrocarbons containing catalyst poisons into products of lower molecular weight with high activity cracking catalyst susceptible to catalyst poisons, the cascade flow process resulting in higher yields of desired motor fuel fractions than those obtainable with conventional riser flow fluid catalytic cracking processes. Catalyst poisons, e.g. nitrogen compounds, sulfur compounds, heavy metal compounds and high Conradson Carbon Residues, are removed from the heavy hydrocarbon charge stocks by first contacting the charge stock containing catalyst poisons with a low activity catalyst comprising used catalyst from the process under fluid catalytic cracking reaction conditions effective for the conversion of a minor portion of the heavy feed hydrocarbons to hydrocarbons of lower molecular weight, recovering gas oils from the products of said first fluid catalytic cracking reactor and subjecting the gas oils to more severe cracking conditions in the presence of high activity cracking catalyst, e.g. a molecular sieve catalyst.

REFERENCES:
patent: 2444131 (1948-06-01), Delattre-Seguy
patent: 2461958 (1949-02-01), Bonnell
patent: 3143491 (1964-08-01), Bergstrom
patent: 3494858 (1970-02-01), Luckenbach
patent: 3761391 (1973-09-01), Conner
patent: 3856659 (1974-12-01), Owen
patent: 3894933 (1975-07-01), Owen et al.
patent: 4116814 (1978-09-01), Zahner

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