Method for controlling regenerator temperature in a fluidized catalytic cracking process

Patent · Tue Dec 08 04:00:00 EST 1981

OSTI ID:5829957

Castagnos, L F; Menzies, W R; Pratt, R E

An improved method is described for controlling the fluidized dense catalyst phase temperature in the regeneration zone of a fluid catalytic cracking unit. In this method, the level of the fluidized catalyst bed above the riser discharge in the reaction vessel is adjusted in response to a change detected in the temperature of the fluidized dense catalyst phase of the regeneration zone. Adjustment of the catalyst bed level in the reaction zone affects the coke laydown on the catalyst in the reactor and, consequently , the amount of heat liberated in the regeneration zone upon combustion of the coke contained in the partially deactivated catalyst. A reactor bed level is attained where the resulting coke laydown on the catalyst is sufficient to maintain the desired temperature in the fluidized dense catalyst phase. Also, as a part of this improved method, the amount of oxygen-containing regeneration gas supplied to the regeneration zone is adjusted to provide sufficient oxygen to effect substantially complete combustion of the coke to carbon dioxide and to maintain the oxygen content of the flue gas at a desired level within the range of from about 1 to about 10 mol %. Maintaining the oxygen content of the flue gas within this range provides a flue gas having a carbon monoxide content of from 0 to 500 ppm. The residence time of catalyst in the regeneration zone fluidized dense catalyst phase is adjusted to provide a regenerated catalyst with a low level of residual carbon-on-regenerated catalyst.

• Assignee: Texaco Inc
• Patent Number(s): US 4304659
• OSTI ID: 5829957
• Country of Publication: United States
• Language: English

Related Subjects

01 COAL, LIGNITE, AND PEAT
010406 -- Coal & Coal Products-- Pyrolysis & Cracking-- (-1987)
02 PETROLEUM
020400* -- Petroleum-- Processing
CATALYSTS
CATALYTIC CRACKING
CHEMICAL REACTIONS
COKE
CONTAMINATION
CONTROL
CRACKING
DECOMPOSITION
FLUIDIZATION
HYDROCARBONS
ORGANIC COMPOUNDS
PYROLYSIS
REGENERATION
TEMPERATURE CONTROL
THERMOCHEMICAL PROCESSES