Improved resid processing in FCC units with catalyst coolers

Conference · Sat Jan 01 04:00:00 EST 1994

OSTI ID:7024399

Myers, D N; Knapik, P G; Lacijan, L A; Brandner, K J ^[1]

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1. UOP, Des Plaines, IL (United States)

Since the beginning of FCC resid processing, UOP has recognized the need to control regenerator temperatures. Excessively high regenerator temperature will result in: increased catalyst deactivation and the need for high fresh-catalyst addition rates; higher dry gas make caused by the initial contacting of feed with very hot catalyst; and decreased conversion and gasoline yield because of the lower catalyst-to-oil ratio. Depending on specific feedstock, equipment, and refiner considerations, UOP usually recommends the use of a single-stage, complete-combustion regenerator for feeds containing up to 6 wt-% Conradson carbon. This design, which eliminates the need for a CO boiler, has proven itself to be extremely efficient. The coke is burned primarily in a plug-flow combustor-riser, catalyst is well mixed, and heat transfer between catalyst and flue gas is good. As the Conradson carbon content of the feedstock increases above 3 or 4 wt-%, the advantages of a two-stage regenerator must be evaluated. Above a Conradson carbon content of about 6 wt-%, this design is usually optimum because it allows operation in a partial combustion mode and, therefore, minimizes the regenerator temperature resulting from a high delta coke operation. A CO boiler is required for the two-stage regenerator system. UOP catalyst coolers are equally applicable to both types of regenerators. With 21 commercial installations, 15 of which are revamps, UOP has demonstrated a reliable catalyst cooler design that can be applied to many regenerator styles. Refiners are more confident in their ability to process resids because of the demonstrated reliability of the UOP catalyst cooler.

• OSTI ID: 7024399
• Report Number(s): CONF-9403125--
• Country of Publication: United States
• Language: English

Related Subjects

02 PETROLEUM
020400* -- Petroleum-- Processing
CATALYSTS
CATALYTIC CRACKING
CHEMICAL REACTIONS
CONTROL
COOLING SYSTEMS
CRACKING
DEACTIVATION
DECOMPOSITION
DESIGN
ENERGY SOURCES
ENERGY SYSTEMS
FOSSIL FUELS
FUELS
MITIGATION
PETROLEUM
PETROLEUM FRACTIONS
PETROLEUM RESIDUES
PYROLYSIS
REGENERATION
TEMPERATURE CONTROL
THERMOCHEMICAL PROCESSES