Abstract: A process for removing catalyst fines and more than 99% of sulfur oxides in the regenerator effluent gas of a fluid catalytic cracking system, which comprises contacting within a venturi structure a gaseous effluent containing sulfur oxides with a liquid scrubbing mixture; passing the admixture of said gaseous effluent and liquid scrubbing mixture through a constricted passage of the venturi structure to increase the velocity thereof; separating the admixture into a liquid portion and a gas portion; delivering the gas portion of the separation step to a packed tower beneath the packed section thereof; contacting the gas portion with liquid scrubbing mixture in the packed section of the tower to form a gaseous overhead effluent substantially free of sulfur oxides and a bottoms liquid; combining the bottom liquid from the packed section of the tower with the liquid portion from the separating step to form a combined liquid bottoms; adjusting the pH of the combined liquid bottoms with a basic solution to form a

Abstract: A process for removing catalyst fines and acidic gases from a fluid catalytic cracking process regenerator gaseous effluent by scrubbing the effluent with an aqueous scrubbing mixture maintained within a critical pH range in a jet ejector venturi scrubbing system.