Closed FCC cyclone system

Patent · Tue May 13 04:00:00 EDT 1986

OSTI ID:5516394

Kam, A Y; Krambeck, F J; Schatz, K L

An apparatus is described for the fluid catalytic cracking of a hydrocarbon feed in a closed cyclone system. The apparatus consists of: a reactor vessel; a riser conversion zone defined by a vertically disposed elongated tubular conduit means having an upstream end and a downstream end, the downstream end terminating within the reactor vessel; the riser conversion zone having a suspension of hydrocarbon feed and catalyst introduced into the upstream end thereof and a mixture of the catalyst and cracked hydrocarbon feed exiting from the downstream end thereof; a primary cyclone connected to the downstream end by a first enclosed conduit; a first surge capacity means located on the first enclosed conduit, for accommodating a sudden increased rate of flow of the mixture within the first enclosed conduit, the first surge capacity means being substantially closed during a normal rate of flow of the mixture within the first enclosed conduit, wherein the first surge capacity means comprises first means for preventing catalyst flow therethrough when the first surge means is substantially closed and first means for allowing stripping gas flow therethrough when the first surge means is substantially closed; a secondary cyclone connected to the primary cyclone by a second enclosed conduit, the first and the second conduits completely separating the material conducted therein from the atmosphere of the reactor vessel; means defining a catalyst stripping zone; and means for passing at least a portion of stripping gas from the catalyst stripping zone to the riser conversion zone.

• Assignee: Mobil Oil Corp., New York, NY
• Patent Number(s): US 4588558
• OSTI ID: 5516394
• Country of Publication: United States
• Language: English

Related Subjects

02 PETROLEUM
020400* -- Petroleum-- Processing
CATALYSTS
CATALYTIC CRACKING
CHEMICAL REACTIONS
CHEMICAL REACTORS
CONCENTRATORS
CRACKING
CYCLONE SEPARATORS
DECOMPOSITION
DISPERSIONS
EQUIPMENT
FLOW RATE
FLUID FLOW
GAS FLOW
HYDROCARBONS
INERTIAL SEPARATORS
MIXTURES
ORGANIC COMPOUNDS
POLLUTION CONTROL EQUIPMENT
PYROLYSIS
SEPARATION EQUIPMENT
THERMOCHEMICAL PROCESSES