FCC process for reducing sox using H.sub.2 S free lift gas

Details FCC process for reducing sox using H.sub.2 S free lift gas FCC process for reducing sox using H.sub.2 S free lift gas

1992-03-16

1993-12-07

Myers, Helane

Mineral oils: processes and products

Chemical conversion of hydrocarbons

Solids contacting and mixing

208161, 208164, 208152, 208157, 208163, C10G 1118

Patent

active

052680908

ABSTRACT:
This invention provides a method of reducing the sulfur oxide emissions from the regenerator of an FCC process that cracks a sulfur containing feedstream. The sulfur oxide emissions are reduced by using an essentially sulfur free lift gas stream to shift the sulfur concentration equilibrium between the product stream from the reaction zone and the flue gas stream from the regeneration zone. Sulfur compounds present in the FCC feed leave the reaction zone as volatile sulfurous gases in the product vapor stream or as adsorbed sulfur compounds on the catalyst. Sulfurous gas in the product vapors is mainly H.sub.2 S. By lowering the concentration of H.sub.2 S that enters the riser with the lift gas the equilibrium reaction of sulfur with hydrogen in the riser is favorably shifted to increase the production of H.sub.2 S and decrease the lay down of sulfur compounds in the coke that forms on the catalyst. As a result less sulfur enters the regeneration zone with the spent catalyst and fewer sulfur oxides are formed during regeneration.

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