The invention discloses a method for synthesizing o-chloro-p-aminotoluene from o-chloro-p-nitrotoluene through
catalytic hydrogenation. The method comprises the following steps: enabling the o-chloro-p-nitrotoluene to be dissolved in a methyl
alcohol solvent according to a
mass ratio of 1 to 1, and adding a
raney nickel catalyst; after dissolving, feeding
hydrogen, wherein a
molar weight proportion of the o-chloro-p-nitrotoluene to the
hydrogen is 1 to (3.5 to 4), controlling a
reaction temperature to be 90-95 DEG C, and controlling a reaction pressure to be 1.6-2.2 MPa; while an input amountof the o-chloro-p-nitrotoluene is 1
ton, reducing reaction time is about 5-6 hours; transferring reducing solution to a
solvent distillation column, performing atmospheric
distillation to obtain coarse o-chloro-p-aminotoluene; transferring the coarse o-chloro-p-aminotoluene to a rectifying
tower, performing negative pressure
distillation to obtain refined o-chloro-p-aminotoluene, wherein a purityof the o-chloro-p-aminotoluene measured by using a gas chromatographic method is greater than 98.00%. Multi-
sulfur waste water and multi-
sulfur waste residues are not generated in a production process, the method is energy-saving and
environmentally friendly, an operating process of the technology is simple and controllable, and production cost is reduced.