Abstract: The distribution of S Zorb units in China and the operation data of 28 industrial units in 2023 were introduced. By comparing the 2023 operation data of different S Zorb units, it was found that although there were significant differences in the sulfur and olefin content of raw material, main operating parameters, octane loss and adsorbent activity, all the units could stably produce gasoline that met the China VI standard, which indicated that the S Zorb unit has a good adaptability. Based on the summarized operation data of SINOPEC S Zorb units since 2011, it was found that sulfur content in raw material of SINOPEC S Zorb plant fluctuated greatly, and the olefin content was decreasing year by year, however, the desulfurization rate of the units was basically unchanged, and the olefin saturation reaction and octane number loss changed greatly.

Key words: S Zorb, unit distribution, operating parameters, olefin