Abstract: Taking the S-Zrob gasoline desulfurization unit (1.5 Mt/a) in a Sinopec company as a research subject, this study introduced the running conditions after improvement of the unit. Two typical problems during operation were analyzed: (i) coking in feed heat exchanger E101 and (ii) degassing line wear leakage of D105 for receiving the used catalyst. The results showed that (i) strictly controlling the raw material source and prohibiting the gasoline with high content of gum or the non-transparent gasoline entering into the S-Zorb equipment are important to ensure the long period operation for feed heat exchanger E101; (ii) controlling the hydrogen flow rate of D105 for extraction and line speed in a reasonable range, at the same time, upgrading the material of degassing line. And (iii) in addition, strictly controlling the amount of fine powder in the system; and periodically measuring the thickness of the weak point of pipeline to ensure the long period operation of the unit.

Key words: adsorption desulfurization, leakage, degas, differential pressure