Abstract: To reduce the diesel/gasoline ratio, SINOPEC Fushun Research Institute of Petroleum and Petrochemicals has developed a diesel middle pressure hydrocracking FDHC technology, consisting of hydrocracking and hydrorefining processes. The problems of lower smoke point of jet fuel produced by middle pressure hydrocracking process and the quality reduction of products at the end of running are solved. The optimized catalyst system, feedstocks, and operation conditions make the FDHC technology suitable to process straight-run diesel fraction, meanwhile the high quality jet fuel, feedstocks for catalytic reforming and steam cracking can flexibly be produced. The smoke point of jet fuel produced reaches 28.1 mm, which can be used as 3# jet fuel. The BMCI of unconverted diesel oil is only 9.5, a high quality feed for steam cracking unit.

Key words: straight-run middle distillate, middle pressure hydrocracking, jet fuel, steam cracking feed, reforming feed