Abstract: Based on the analysis of DCC process unadaptable to inferior feedstock，a novel high efficient fast fluidized bed with special structure for heavy oil catalytic cracking was developed for production of propylene，and accordingly to form a process called RTC（Residue To Chemicals）. The old DCC unit in SINOPEC Anqing Company was revamped with the new RTC process by replacing the previous reactor of riser plus dense phase bed with the new developed fast fluidized bed reactor. Subsequently, the commercial application was completed. The commercial application results showed that in comparison with DCC，RTC not only showed excellent adaptability to inferior feed blended with hydrotreated residue，but also produced more propylene and ethylene with higher selectivity while coke and slurry yields decreased. In addition，the gasoline property was improved due to lower olefin content，higher aromatics and higher RON by applying RTC process.

Key words: high efficient deep catalytic cracking, chemicals, fast fluidized bed, inferior resid