System and method for producing chemical raw materials from distillate oil

The invention discloses a system and a method for producing chemical raw materials from distillate oil. The method comprises the following steps: selectively saturating polycyclic aromatic hydrocarbon in distillate oil through mild pre-hydrotreating to obtain monocyclic aromatic hydrocarbon, reducing the polarity of the aromatic hydrocarbon in the raw material, and separating the aromatic hydrocarbon from non-aromatic hydrocarbon in a simulated moving bed adsorption separation device to obtain adsorptive separation heavy aromatic hydrocarbon and adsorptive separation non-aromatic hydrocarbon, and the adsorbed and separated heavy aromatics enter a heavy aromatics lightening reactor to obtain high-purity light aromatics and a high-quality ethylene cracking material, and the adsorbed and separated non-aromatics are discharged from the device. According to the invention, the separation purity of the adsorption separation device can be obviously improved, the energy consumption is reduced, and the yield of high-va