Abstract: The main causes of lower processing capacity than the design value of the 900 kt/a S Zorb unit in SINOPEC Jinan Company were analyzed and counter measures were discussed. Since adopting measures, such as adding another feed filter, cleaning heat exchanger of feed, increase the riser outlet temperature of FCC unit, increase the direct feed supply temperature from FCC unit to S Zorb unit, adjusting the cycle rate of sorbent and frequency of regeneration, using heavy gas as fuel of heating furnace, reducing the reaction temperature and using high-purity hydrogen, the processing capacity of said S Zorb unit has an increment of about 11 t/h and the gasoline product also well meets the requirement of National Emission Standard III.

Key words: S Zorb unit, processing capacity, furnace, reaction temperature , adsorbent