초록 ▼

Process for reduction of sulfur oxides emissions to the atmosphere from FCC regenerators. Spent FCC cracking catalyst containing sulfur and coke deposits is stripped at 500°to 700°C. for 1 to 10 minutes with steam to remove at least a portion of said sulfur deposits from said catalyst prior to catal

Process for reduction of sulfur oxides emissions to the atmosphere from FCC regenerators. Spent FCC cracking catalyst containing sulfur and coke deposits is stripped at 500°to 700°C. for 1 to 10 minutes with steam to remove at least a portion of said sulfur deposits from said catalyst prior to catalyst regeneration.

대표청구항 ▼

In a process for catalytic cracking of a sulfur containing hydrocarbon charge by contacting said charge at cracking temperature with a circulating inventory of cracking catalyst to produce cracked vapor product and spent catalyst with deposits of coke and sulfur compounds, wherein at least a portion

In a process for catalytic cracking of a sulfur containing hydrocarbon charge by contacting said charge at cracking temperature with a circulating inventory of cracking catalyst to produce cracked vapor product and spent catalyst with deposits of coke and sulfur compounds, wherein at least a portion of said spent catalyst is regenerated with an oxygen-containing gas at regeneration conditions including a regeneration temperature higher than said cracking temperature and sufficient to burn at least a portion of said coke and said sulfur deposits to generate oxides of carbon and sulfur oxides and regenerated catalyst with reduced coke content which is recycled to contact said hydrocarbon charge, the improvement comprising subjecting said spent catalyst to stripping at a temperature of 500°to 700°C with steam for about 1 to 10 minutes, said improved process being further characterized by the absence of oxygen during said stripping and the absence of any SOx removal additives on said catalyst.