Abstract: The 2# gasoline and diesel hydrotreating unit in SINOPEC Shijiazhuang Refining & Chemical Company was revamped and upgraded by using the SSHT technology developed by SINOPEC Research Institute of Petroleum Processing. The upgraded unit with a new added hydrotreating reactor used FCC diesel and coker naphtha as feedstocks to produce diesel and gasoline with mass fraction of sulfur of less than 10 μg/g through deep hydrodesulfurization. However some problems occurred during the operation, including the temperature rise of the reaction system on the right side, interruption of the cold oil, large radial temperature difference of the reactor, fluctuation of the liquid level of the high-pressure separator, and the unqualified color of the diesel product. To solve these problems, the short-term and long-term solutions were proposed to ensure the stable production and quality of the products.

Key words: FCC diesel, hydrotreating, quality upgrading, operation problems