The invention relates to the field of the production of aromatic compound 2,7-dibromo fluorenone and particularly relates to a method for preparing the 2,7-dibromo fluorenone, which is characterized by comprising the following steps of: (1) taking industrial 2,7-dibromo fluorine, a benzene series solvent, potassium hydroxide, quaternary ammonium salts, and adding the constituents in a four-opening bottle; (2) heating to a temperature of 80-90 DEG C for reaction, and inletting air for oxidization; (3) depressurizing and distilling, and obtaining a yellow 2,7-dibromo fluorenone crystal after condensate is crystallized; and (4) carrying out once washing by water, and drying to obtain the product, i.e. the 2,7-dibromo fluorenone. The benzene series solvent is toluene or xylene. Compared with the prior art, the method for preparing the 2,7-dibromo fluorenone has the beneficial effects that: the reaction temperature is low, and the operation is simple and convenient; the low-cost potassium hydroxide is taken as a catalyst, thus, the cost is low; the benzene series solvent can be recovered and recycled through depressurizing and distilling, the amount of washing water is little and the treatment is easy, and the pollution to the environment is little; and the gas-phase chromatographic purity of the product is higher than 99.2%, the yield is higher than 85%, and thus, the production requirements are met.

Jia Liu

Papers

Method for preparing 2,7-dibromo fluorenone