Abstract: On the basis of DCC technology, CNOOC Dongfang Petrochemical Co., Ltd. has adopted the DCC-plus technology developed by RIPP for increasing propylene yield and decreasing dry gas and coke yields since Feb. 2014. To meet the actual production requirements, adjustment and improvement are conducted on the original designed DCC-plus unit for olefin production to produce more gasoline and diesel. The commercial results indicate that the total liquid yield of DCC-plus unit reaches 82.23%, and the propylene yield is 8.07% under the moderate operation condition using atmosphere residue of the mixed Lufeng / Weizhou crude oil as feedstock, and the commercial performance shows that DCC-plus process has a good flexibility of product slate.

Key words: catalytic cracking, propylene, commercial test, operation flexibility