Abstract: The catalytic diesel and C10+ heavy aromatics produced by a petrochemical enterprise have a large output and poor properties. In order to solve the problem of difficult processing of heavy aromatics oil, some FCC diesel and C₁₀+ heavy aromatics were modified to the coker gasoline/diesel hydrogenation unit for processing. Industrial experiments were conducted on blending heavy aromatics oil at different ratios, and the changes of raw material propertyies, main operating parameters, product properties, material balance and other data under different operating conditions were compared and analyzed. The results showed that when the inlet hydrogen partial pressure was 7.0 MPa and inlet hydrogen/oil volume ratio was 530-580, after blending about 8% heavy aromatic oil, the diesel blending component with a sulfur mass fraction of 7.3 μg/g, a cetane number of 49.2 and a polycyclic aromatic hydrocarbon content of 6% was obtained. Under the conditions of low pressure and low hydrogen/oil ratio, the saturation of aromatics can reach equilibrium at low reaction temperature, and the amount of heavy aromatics can be adjusted according to the equilibrium conversion rate.

Key words: C₁₀+ heavy aromatics, coker gasoline/diesel, hydrogenation, polycyclic aromatics, cetane number