Combination process for producing lubricating base oil

The present invention discloses a method for producing a lubricating oil base oil. To de-oil or light distillate oil as raw materials, hydrocracking - composition process for producing a lubricating base oil dewaxing. Hydrocracking unit tail end of an oil supply oil directly ISODEWAXING raw material unit, a new once-through hydrogen ISODEWAXING oil tail unit, which is returned directly to the tail hydrogen hydrocracking unit do make-up hydrogen. Since the two units to achieve the depth of the joint is only a hydrogen circulation system, construction investment and operating costs of the device significantly reduced, product quality has improved.