Method for recycling Al resources in Friedel-Crafts reaction

The invention relates to a method for recycling Al resources in a Friedel-Crafts reaction. The method comprises steps performed after the Friedel-Crafts reaction as follows: (1), a reaction system is concentrated, a reaction solvent is recovered, a replacement solvent is added to disperse concentrated residues when the size of the reaction system is concentrated to 20%-50% of the original size, and concentration is continued until the reaction solvent is completely eliminated; (2), the temperature of the system obtained after the step (1) is controlled to range from subzero 20 DEG C to 100 DEG C, water is added to the system, the mixture is sufficiently mixed and filtered, the replacement solvent is recovered after filtrate is concentrated, meanwhile, a product of the Friedel-Crafts reaction is obtained, aluminum(III) chloride hexahydrate is obtained after a filter cake is dried, and the mole ratio of the added water to aluminum (III) chloride is (1-10):1. According to the method, no wastewater or acid gas is produced, the operation is simple, and environmental protection is facilitated.