Catalytic hydrogenation method for inferior wax oil

The invention discloses a catalytic hydrogenation method for inferior wax oil. The method comprises the steps: (1) introducing the inferior wax oil to a first reaction zone for first hydrofining in the presence of hydrogen gas; (2) introducing effluent of the first reaction zone to a flash vaporization section for flash vaporization, so as to obtain a gas-phase component and a liquid-phase component; (3) introducing the liquid-phase component to a second reaction zone, and subjecting the liquid-phase component to countercurrent contact with hydrogen gas introduced from the bottom of the second reaction zone, so as to carry out second hydrofining; and (4) mixing effluent of the second reaction zone with the gas-phase component obtained in the step (2), and then, introducing the mixture into a gas-liquid separation system and a fractionating system sequentially. According to the method disclosed by the invention, the sulfur content and nitrogen content of high-sulfur and high-nitrogen inferior raw materials can be remarkably lowered, and the operating cycle of a catalytic hydrogenation device can be prolonged.