Multistage fcc catalyst stripping

Patent · Tue Oct 22 04:00:00 EDT 1991

OSTI ID:6884352

Sapre, A V

This patent describes a fluid catalytic cracking process for cracking hydrocarbons. It 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 on the catalyst to evolve spent catalyst; disengaging the spent catalyst from the hydrocarbon products; flowing the spent catalyst to a regeneration zone; passing an oxygen-containing gas upwardly through the regeneration zone at sufficient velocity to fluidize the catalyst contained within the regeneration zone; retaining the catalyst in the regeneration zone at elevated temperature for a time sufficient to effect exothermic oxidative regeneration of the catalyst by burning the coke deposited thereon, thereby heating and reactivating the catalyst; providing a catalyst stripping zone comprising three superimposed stages, the stages comprising an upper mixing stage, a central dehydrogenation/stripping stage, and a lower steam stripping stage; mixing spent catalyst with regenerated catalyst in the upper mixing stage of the catalyst stripping zone; retaining the mixture within the upper mixing stage at elevated temperature for a period of time sufficient to effect desorption of cracked products from the spent catalyst; flowing the catalyst mixture downwardly to the central dehydrogenation/stripping stage.

• Assignee: Mobil Oil Corp., Fairfax, VA (United States)
• Patent Number(s): US 5059305; A
• Application Number: PPN: US 7-649280
• OSTI ID: 6884352
• Country of Publication: United States
• Language: English

Related Subjects

02 PETROLEUM
020400* -- Petroleum-- Processing
020500 -- Petroleum-- Products & By-Products
CATALYSTS
CATALYTIC CRACKING
CATALYTIC EFFECTS
CHEMICAL REACTION KINETICS
CHEMICAL REACTIONS
COKE
CRACKING
DECOMPOSITION
HYDROCARBONS
INDUSTRIAL PLANTS
INORGANIC ION EXCHANGERS
ION EXCHANGE MATERIALS
KINETICS
MATERIALS
MINERALS
ORGANIC COMPOUNDS
PETROLEUM PRODUCTS
PETROLEUM REFINERIES
PYROLYSIS
REACTION KINETICS
SILICATE MINERALS
THERMOCHEMICAL PROCESSES
ZEOLITES