Abstract: The combined process consistent of high pressure hydrotreating and hydrofinishing, developed by SINOPEC Fushun Research Institute of Petroleum and Petrochemical, was adopted for the regeneration of waste lubricant oil in a bench scale hydrotreating unit. The oil fraction below 510 ℃ obtained by distillation of waste lubricant was used as hydrotreating feed. The test goal is to retain the majority of high-quality base oil component and simultaneously remove the impurities and saturate the aromatics in the feed. The test results show that at the reaction conditions of pressure of (base+5) MPa, hydrotreating/hydrofinishing reaction temperature of (base+20) ℃/(base+10)℃,respectively and liquid volume space velocity of base/(base+1.0) h-1, respectively, and hydrogen/oil volume ratio of 800, the color of produced oil reaches +30, the > 400 ℃ fraction produced has a pour point of -18 ℃, viscosity (100 ℃) of 6.856 mm2/s and VI of 100, which can meet the standard requirements of SINOPEC HVI Ⅱ6# base oil. The fraction of 320-400 ℃ has a pour point of -23 ℃ with viscosity (100 ℃)of 3.218 mm2/s and VI of 100, which meets the standard requirements of SINOPEC HVI Ⅱ3# base oil or 3 # industrial white oil product. The fraction of 280-320 ℃ with pour point of -45 ℃, viscosity (40 ℃) of 6.725 mm2/s meets the standard requirements of PetroChina 40# universal transformer oil. The liquid yield of >320 ℃ fraction is 82.6% and the total liquid yield is more than 98%.

Key words: waste lube oil, hydrotreating, hydrofinishing, noble metal