Synthetic method for 2,6-dichlorophenol

The invention discloses a synthetic method for 2,6-dichlorophenol. Phenol, chlorobenzene and N-methylaniline are added in a chlorination kettle, stirring is carried out, the temperature is risen slowly to 65-75 DEG C, the air suction speed of chlorine is adjusted to 5-30 cubic liters/h, the chlorination temperature is kept at 70-100 DEG C, chlorination is finished, and then nitrogen is employed to expel chlorine; the solvent in the chlorination kettle is transferred to a distillation still, then heating is carried out, vacuum-pumping is carried out, after total reflux is carried out for 0.5h, front fractions are received slowly, when the content of 2,6-dichlorophenol is more than or equal to 99.0% through middle control analysis, reception of the 2,6-dichlorophenol main fraction is started, when the content of 2,6-dichlorophenol is more than or equal to 99.3%, a reception valve is closed, and an object product is obtained. In the reaction, a solvent chlorobenzene and a catalyst N-methylaniline are used, thus the overall yield of the synthesized 2,6-dichlorophenol is more than 93%, and the purity of 2,6-dichlorophenol is more than 99.5%. The synthetic method is environmentally friendly, is safe, and meets international standards.