Abstract: To eliminate the factors affecting the stable operation of FCC naphtha adsorptive desulfurization (S Zorb) units, based on the accumulated experience and know-how in refining and chemical engineering design, SINOPEC Engineering Incorporation applies various technology innovations and transplantations in the localization of the first seven S Zorb units, such as developing a dustfall device for reactor to prolong the service life of back-flush valve, improving regeneration system to solve the caking of adsorbent, arranging feed/reactant heat exchangers in parallel two-row to maintain continuous operation, and adopting lock hopper control system to ensure the transport of adsorbent smoothly. After completing design and construction, these units go on stream successfully and their operation cycles prolong significantly, furthermore, their adsorbent consumption and energy consumption are reduced as compared with base case, which indicates a new generation of S Zorb technology is developing to support the upgrade of gasoline quality.

Key words: S Zorb, FCC naphtha, desulfurization, dustfall device, adsorbent