Abstract: The original design of 0.9 Mt/a diesel hydro-upgrading unit in a refinery adopted the FCC diesel hydro-conversion technology (FD2G) developed by SINOPEC (Dalian) Research Instituteof Petroleum and Petrochemicals Co.,Ltd.(FRIPP). In order to cope with changes in the oil product market, the company decided to adopt diesel hydrocracking technology (FDHC）developed by FRIPP after the completion of the unit.By changing the feedstocks, changing the catalyst system and revamping the local process, the production scheme was adjusted from gasoline scheme to jet fuel scheme. The results of calibration showed that the yield of heavy naphtha was 21.90%, the potential content of aromatics was 48.5%, the yield of jet fuel was 33.33 %, the yield of refined diesel was 31.93 %, and content of sulfur and nitrogen was lower than that of raw diesel, which could be used as the blending component of diesel meeting the standard of China Ⅵ. As the first time that the diesel hydro-upgrading unit was successfully revamped from FD2G technology into FDHC technology in China, this industrial application can provide reference for same type units.

Key words: FD2G technology, FDHC technology, modification, diesel, jet fuel