Abstract: The operation of the 1.8 Mt/a gas oil hydrotreating unit and the effect on the FCC product distribution in SINOPEC Wuhan Company as well as the problems using the mixture of LCO and gas oil as the unit feed were introduced. The measures for solving the problems were suggested. The RVHT technology and related catalysts developed by SINOPEC Research Institute of Petroleum Processing were adopted to process the mixed feed of CGO and VGO. The sulfur and nitrogen content of the hydrotreated effluent is less than 1 000 μg/g and 1 200 μg/g, respectively. Compared with the gas oil without hydrotreating, in the cases of feeds containg hydroteated gas oil of 89.50% in 1# FCC unit and 65.53% in 2# FCC unit, the gasoline yield increases 3.590% and 1.905%, respectively, though the yield of LCO is not improved significantly, however, the yield of slurry, coke and dry gas decreases. When VGO mixed with FCC LCO is used as hydrotreating unit feed, the hydrogen consumption and the reaction temperature rise markedly, while the effect on the catalysts reactivity and running cycle is less. The fluctuation of system pressure during operation is mitigated by increasing return hydrogen from circulation line and thereby decreasing the hydrogen/oil ratio in reactor inlet.

Key words: gas oil hydrotreating unit, FCC, product distribution, mixture of the LCOand gas oil