Patent ID: 6129833
Filing Date: 2000-10-10
Classification: B01J,C10G

Abstract:
A process for the cyclic fluidized catalytic cracking of a hydrocarbon feedstock containing organic sulfur compounds, which process comprises:cracking the hydrocarbon feedstock under fluidizing conditions using a particulate cracking catalyst in a reactor zone, whereby the cracking catalyst is deactivated by sulfur-containing coke deposits;passing the deactivated cracking catalyst to a regenerator zone;removing the sulfur-containing coke deposits from the deactivated cracking catalyst in the regenerator zone by burning with an oxygen containing regeneration gas, thereby forming sulfur oxides;absorbing the sulfur oxides in the regenerator zone with a fluidizable particulate sulfur oxide catalyst/absorbent additive comprising about 5 to about 15 wt. % of copper (Cu) and about 5 to about 25 wt. % of lithium oxide; andremoving the absorbed sulfur oxide from the particulate sulfur oxide-reducing additive as a sulfur-containing gas comprising hydrogen sulfide in the reactor zone.