Continuous production process of 3, 3 '-dichlorobenzidine hydrochloride

The invention relates to the technical field of chemical engineering, in particular to a continuous production process of 3, 3 '-dichlorobenzidine hydrochloride. The preparation method comprises the following steps: preparing 2, the preparation method comprises the following steps: dissolving 2-chloronitrobenzene, sodium hydroxide and a supramolecular compound beta-cyclodextrin into water, stirring and heating, then stopping the reaction, sequentially cooling and filtering to obtain a solid, sequentially washing with diluted hydrochloric acid and water until the solid is neutral, drying at normal pressure, recrystallizing with absolute ethyl alcohol and the solid, then adding toluene for dissolving, and filtering to obtain the 2, 2 '-dichlorohydrazobenzene. The preparation method comprises the following steps: adding 3, 4-dimethoxy-3, 4-dimethoxy-3, 4-dimethoxy-3, 4-dimethoxy-3, 4-dimethoxy-3, 4-dimethoxy-3, 4-dimethoxy-3, 4-dimethoxy-3, 4-dimethoxy-3, 4-dimethoxy-3, 4-dimethoxy-3, 4-dimethoxy-3, 4-dimethoxy-