Abstract: The operation data of FCC unit in SINOPEC Luoyang Company prior and post to revamping by FDFCC-Ⅲ technology were compared. Results showed that the revamping was successful; FDFCC-Ⅲ technology exhibited the advantages of reducing sulfur and olefin contents of gasoline, enhancing LPG yield and providing cleaner production. However, shortcomings of higher energy consumption and less propylene yield during the operation were analyzed technically and some suggestions for further improvement were put forward.

Key words: catalytic cracking, dual-riser, gasoline, propylene, advantage