One method of synthesis of p-chlorophenyl hydrazine hydrochloride

The present invention discloses a method for synthesizing p-chlorophenyl hydrazine hydrochloride, comprising the steps of: chlorobenzene bromine, hydrazine hydrate as the starting material, a phase transfer catalyst, solvent, reaction catalyst; After completion of the reaction, filtered the solid was isolated, the solvent was distilled off the filtrate; hydrochloric acid was added to the residue obtained was distilled, after stirring was filtered; the cake washed with water and dried to give p-chlorophenyl hydrazine hydrochloride. The present invention solves the conventional diazotization Dui chloro commonly used to restore a large number of problems caused by acidification of wastewater to bromine chlorobenzene, hydrazine hydrate as the starting material, a phase transfer catalyst, solvent, reaction catalyst, the reaction step simple, greatly reducing the amount of waste water produced during the synthesis chlorophenyl hydrazine, to avoid reduction of sodium sulfite sulfur dioxide, the present method of reacting an excess of hydrazine hydrate and the solvent can be recycled and reused, green.