No.5 industrial white oil and preparation method thereof

The invention relates to the technical field of petrochemical engineering, and particularly discloses industrial white oil No. 5 and a preparation method thereof. According to the preparation method disclosed by the invention, hydrocracked diesel oil fraction is taken as a raw material, and the diesel oil fraction is subjected to the steps of hydrocracking, hydrogenation dearomatization and stripping to remove light components, so that the No.5 industrial white oil is obtained; the process conditions of hydrocracking are as follows: the reaction pressure is 1.0-5.0 MPa; the reaction temperature is 200-300 DEG C; the volume space velocity during feeding is 1.0-4.0 hr ; the volume ratio of the hydrogen to the diesel fraction is (200-600): 1; the process conditions of hydrogenation dearomatization are as follows: the reaction pressure is 1.0-5.0 MPa; the reaction temperature is 180 to 280 DEG C; the volume space velocity during feeding is 0.5-3.5 hr ; the volume ratio of the hydrogen to the hydrocracke