Purification method of crude 2,3-dimethyl pyridine

The invention discloses a purification method of crude 2,3-dimethyl pyridine, which mainly includes the following steps: adding ethanol, phenol, cyclohexane, dibasic acid and zirconium oxide catalyst in crude 2,3-dimethyl pyridine and then conducting salification, crystallization, washing, resolving, extraction and desolvation in sequence to obtain refined 2,3-dimethyl pyridine. The preparation method is simple; zirconium oxide catalyst is added in reaction, therefore, the reaction degree and the reaction speed are high; the purification of the 2,3-dimethyl pyridine can be effectively conducted by simple technological operation; and the obtained 2,3-dimethyl pyridine is high in purity.