Heavy oil catalytic cracking

Details Heavy oil catalytic cracking Heavy oil catalytic cracking

C - Chemistry, Metallurgy

10

G

196/111

C10G 11/18 (2006.01)

Patent

CA 1320924

F-3734 HEAVY OIL CATALYTIC CRACKING ABSTRACT A fluid catalytic cracking process and apparatus is described which includes a high temperature stripper (hot stripper) to control the carbon level and sulfur on spent catalyst, followed by catalyst cooling to control the regeneration inlet temperature. The high temperature stripper operates at a temperature between 55°C (100°F) above the temperature of a catalyst-hydrocarbon mixture exiting a riser and 816°C (1500°F). The regenerator inlet temperature is controlled to obtain the desired regeneration temperature 9 regenerator outlet temperature, and degree of regeneration. The regenerator is maintained at a temperature between 55°C (100°F) above that of the catalyst in the high temperature stripper and 871°C (1600°F). The present invention has the advantage that it separates hydrogen from catalyst to eliminate hydrothermal degradation, and separates sulfur from catalyst as hydrogen sulfide and mercaptans which are easy to scrub. The catalyst cooler enables the regenerator and high temperature stripper to be run independently at respective desired temperatures.

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