Process for two-phase fluid catalytic cracking system

Patent · Tue Nov 29 04:00:00 EST 1988

OSTI ID:6337770

Herbst, J A; Owen, H; Schipper, P H

This patent describes a fluid catalytic cracking process, comprising the steps of: introducing particles comprising large pore crystalline zeolite cracking catalyst, particles comprising intermediate pore crystalline zeolite cracking catalyst, and a lift gas into a first zone of a fluid catalytic cracking reactor riser, wherein the large port particles require more frequent regeneration and are more hydrothermally stable than the intermediate pore catalyst, at least one physical characteristic of the intermediate pore particles and the large pore particles differing sufficiently, such that the intermediate pore particles are more elutriatable than the large pore particles; introducing a hydrocarbon feedstock having an initial boiling point of at least 400/sup 0/F into a second zone of the riser to form a mixture under fluid catalytic cracking conditions, the second zone being located downstream of the first zone; discharging the mixture from the riser and passing a stream comprising the catalyst of the mixture to a first catalyst stripping vessel; countercurrently contacting the mixture catalyst in the first stripping vessel with upwardly passing stripping gas to upwardly direct a first portion of the catalyst.

• Assignee: Mobil Oil Corp., New York, NY
• Patent Number(s): US 4787967
• OSTI ID: 6337770
• Country of Publication: United States
• Language: English

Related Subjects

02 PETROLEUM
020400* -- Petroleum-- Processing
BOILING POINTS
CATALYSTS
CATALYTIC CRACKING
CHEMICAL COMPOSITION
CHEMICAL REACTIONS
CHEMICAL REACTORS
CRACKING
CRYSTAL STRUCTURE
DECOMPOSITION
HYDROCARBONS
INORGANIC ION EXCHANGERS
ION EXCHANGE MATERIALS
MATERIALS
MICROSTRUCTURE
MINERALS
ORGANIC COMPOUNDS
PARTICLES
PARTICULATES
PHYSICAL PROPERTIES
POROSITY
PYROLYSIS
RECYCLING
REGENERATION
THERMOCHEMICAL PROCESSES
THERMODYNAMIC PROPERTIES
TRANSITION TEMPERATURE
ZEOLITES