Development and Commercial Application of RSDS-II Technology for Selective Hydrodesulfurization of FCC Naphtha

The FCC naphtha selective hydrodesulfurization technology (RSDS-II) has been tested with different feedstocks in pilot scale. The results show that RSDS-II technology is viable in terms of its adaptability to different feedstocks. To pro-duce gasoline with a sulfur content of less than 50μg/g by the RSDS-II technology, the gasoline RON loss is less than 1.8, 0.9 and 0.2 units, respectively, upon processing the conventional high-sulfur and high-oleifn FCC naphtha, the high-sulfur MIP naphtha, and the medium-sulfur or low-sulfur MIP naphtha. Upon using the naphtha produced from pre-hydrotreated FCC feedstock as the RSDS-II feedstock to manufacture gasoline with a sulfur content of lower than 10μg/g, the RON loss does not exceed 1.0 unit. The RSDS-II technology has been commercialized successfully at many reifneries. The result of operat-ing commercial RSDS-II unit at the Shanghai Petrochemical Company has revealed that upon processing a feedstock con-taining 38.7 v%-43.3 v%of oleifns and 250-470 mg/g of sulfur, the sulfur content in the treated gasoline ranges from 33μg/g to 46μg/g and the RON loss is equal to only 0.3-0.6 units. Till now this RSDS-II unit has been operating smoothly over 30 months. Thanks to its high HDS activity and good selectivity, the RSDS-II technology can meet the reifnery’s needs for adequate upgrading of gasoline.