FCC gasoline auxiliary riser olefin reduction technology

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The FCC gasoline assisted riser olefin reduction technology: Developed by China University of Petroleum (Beijing), this technology involves the directional catalytic conversion of FCC gasoline in an assisted riser; it achieves a reduction in the olefin content of FCC gasoline through reactions such as isomerization, hydrogen transfer, cyclization, aromatization, and dealkylation. This technology has been put into industrial use at the North China Petrochemical Branch, Binzhou Petrochemical Company, and Fushun Petrochemical Branch of China National Petroleum Corporation. To reduce the olefin content in gasoline, the 1.0 Mt/a RFCC unit at the North China Petrochemical Branch underwent technical modifications in January 2003, with the original pre-raising section for FCC gasoline being transformed into an auxiliary rising pipe system for olefin reduction in FCC gasoline. Industrial application results show that the volume fraction of olefins in FCC gasoline decreased from 43% to around 35%; aside from a 0.5-unit drop in the RON value compared to before the modification, it had little impact on the main properties of the product. Compared with the original process, the yields of liquid and light oil increased by 1.5 and 5.7 percentage points respectively, while the yields of dry gas and coke decreased by 0.8 and 1.3 percentage points respectively.