Abstract: In order to maximize the efficiency of resource utilization, a company carried out an industrial test of mixing about 5% deep catalytic cracking(DCC-plus) diesel fraction into 2.1 Mt/a naphthenic low-quality gas oil hydrocracking unit according to the feed characteristics of DCC-plus diesel and gas oil hydrocracking unit. The industrial test results showed that the yield of jet fuel increased by 1.93 percentage points, the smoke point of jet fuel increased by 1.2 mm, and the cetane value of hydrogenated diesel increased by 1.9 units, which improved the properties of jet fuel and diesel. After blending DCC diesel , the temperature rise of refining reactor increased obviously, and the consumption of hydrogen and electricity increased significantly. It is estimated that after blending DCC-plus diesel, which was originally used as a fuel oil blending component, was converted into heavy naphtha, jet fuel and diesel components with higher added value.The profit was 467 Yuan/t (in terms of DCC-plus diesel), and the economic benefit was 40.368 million Yuan/a.

Key words: deep catalytic cracking diesel, gas oil, hydrocracking, naphtha, jet fuel