Modification reaction system and modification reaction method

The invention provides a modification reaction system and a modification reaction method, and relates to the technical field of modification reaction systems.The modification reaction system comprises a feeding unit, a pretreatment unit, a pre-separation unit, a modification reaction unit and an aromatic hydrocarbon separation unit, and the feeding unit comprises a high-cleanliness light hydrocarbon feeding pipe, a naphtha feeding pipe and a refined coal tar feeding pipe; the feeding unit, the pretreatment unit, the pre-separation unit, the modification reaction unit and the aromatic hydrocarbon separation unit are sequentially connected, and raw materials input by a high-cleanness light hydrocarbon feeding pipe, a naphtha feeding pipe and a refined coal tar feeding pipe can be pretreated by arranging a pre-fractionating tower, a deoxidizing tower and a pre-hydrogenation reactor; and conveying the pretreated material to a pre-separation unit for pre-separation, conveying the pre-separated material to a modifi