Abstract: The sulfur transfer additive RFS09 was used in a 1.2 Mt/a FCCU (MIP) in CNOOC Huizhou Petrochemical Company. The application results showed that, at excessive oxygen content of 4.2%~5.5%, and when the accumulation amount of RFS09 reaches 2.56% of the catalyst inventory, the contents of SO3 and SO2 in the flue gas reduce from 527.5 mg/Nm3 and 263.0 mg/Nm3 to 16.0 mg/Nm3 and 14.0 mg/Nm3, respectively, the remove rate reaches 96.97% and 94.67% respectively. Meanwhile, the caustic consumption is decreased by over 90%. The cost accounting of benefit shows that, using the sulfur transfer agent to eliminate the acid mist will not increase the running cost of the company.

Key words: sulfur transfer additive, FCC flue gas, acid mist, SO3, economic benefit