Catalytic cracking process

Patent · Tue May 23 04:00:00 EDT 1978

OSTI ID:6555387

Schwarzenbek, E F

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.

• Assignee: TIC; EDB-79-017212; ERA-04-009623
• Patent Number(s): US 4090948
• OSTI ID: 6555387
• Country of Publication: United States
• Language: English

Related Subjects

02 PETROLEUM
020400* -- Petroleum-- Processing
CATALYSTS
CATALYTIC CRACKING
CHEMICAL REACTIONS
COKE
CRACKING
DECOMPOSITION
ENERGY SOURCES
FOSSIL FUELS
FUELS
GAS OILS
INORGANIC ION EXCHANGERS
ION EXCHANGE MATERIALS
MINERALS
PETROLEUM
PETROLEUM FRACTIONS
PETROLEUM PRODUCTS
PYROLYSIS
RECYCLING
REGENERATION
THERMOCHEMICAL PROCESSES
ZEOLITES