Abstract: Taking the catalytic cracking (FCC) slurry from a certain petrochemical company as the raw material, a combined process of hydroupgrading and distillate cutting is employed. The test results show that the optimal process conditions for hydroprocessing are as follows:a reaction temperature of 320 ℃,a reaction pressure of 8 MPa,a volumetric space velocity of 0.6 h^-1, and a hydrogen-to-oil volume ratio of 1000.The distillation fractionation of the hydrogenation product is carried out, and the fraction between 400 ℃ and 540 ℃ can be used as a high-quality aromatic rubber plasticizer.The yield of this product is 37.53%, the CA (thepercentage of carbon atoms on the aromatic ring to the total number of carbon atoms) is 21.92%, and the mass fraction of PCA is 2.90%.The product properties all comply with the standards of GB/T 33322 for product A1820.The comparative analysis of the Fourier transform infrared spectroscopy (FT-IR) and nuclear magnetic resonance hydrogen spectroscopy (¹H-NMR) spectra of the products revealed that most of the polycyclic aromatic hydrocarbons in the feedstock oil underwent side-chain hydrogenation cracking and hydrogenation saturation reactions, converting into short-side-chain alkane molecules, and the product structure gradually became stable.

Key words: hydroupgrading, distillate cutting, polycyclic aromatic hydrocarbons, rubber plastizing agent