Removing sulfur oxides from flue gases of FCC units.

摘要

An improved process for reducing SOx in the flue gas from FCC regenerators operated in complete combustion mode is disclosed. The FCC riser is modified to include an SOx desorption zone (D) upstream from the zone in the riser in which regenerated cracking catalyst (A) contacts hydrocarbon feedstock (E). The circulating catalyst inventory (A) includes a regenerable SOx adsorbent. In the SOx desorption zone (D), the hot circulating catalyst inventory (A) is mixed with a reducing gas (B) and water vapor (C) and the gas/solid mixture is maintained in that zone for sufficient time to desorb.