Abstract: To resolve the problem of blue smoke and plume tailing from scrubber, a commercial trail of improved RFS SOx transfer additive was performed on a MIP-CGP unit of SINOPEC. After the initial rapid accumulation, the system storage is about 1.5% of catalyst inventory and then the additive is steadily added with rate of 0.024 kg/t based on fresh feed, the industrial application was summed up. The results showed that the application of RFS additive has little influence on product distribution, product properties and unit operation. SO2 and SO3 in flue gas is significantly decreased, therefore the consumption of NaOH solution is also decreased. Furthermore, TDS and COD in waste water and circulating water decline obviously. Blue smoke is diminished and plume tailing is well controlled.

Key words: FCC, flue gas, scrubber, plume, SOx transfer additive