Method for synthesizing o-phenylenediamine through continuous ammoniation

The invention relates to a method for synthesizing o-phenylenediamine by continuous ammoniation, which comprises the following steps: adding o-dichlorobenzene into a continuous reaction kettle, adding liquid ammonia while stirring, heating to 85-100 DEG C, controlling the reaction pressure at 5-6 MPa, adding a catalyst, reacting for 6 hours, separating out an oil phase at 100 DEG C after the reaction is finished, and carrying out vacuum distillation to obtain o-phenylenediamine, the molar ratio of the orthodichlorobenzene to the liquid ammonia is controlled to be 1: (5-10), and the dosage of the catalyst is 1-1.5% of the weight of the orthodichlorobenzene; the catalyst comprises cuprous chloride and a synergy body, the synergy body is structurally a phosphorus ligand skeleton structure and can serve as a strong power supply ligand, when the synergy body is combined with cuprous chloride, the space structure and the electronic effect of a metal center can be influenced, the catalytic activity of a catalytic sy