
240 Refining Used Lubricating Oils
TABLE 7.40
IFP Process: US Patent 5,759,385: Properties After Hydrotreatment
Units
VD Cut
(1 + 2)
Hydrogenated
VD Cut (1 + 2) BS Cut
Hydrogenated
BS Cut
Specic gravity at
15°C
— 0.8768 0.872 0.895 0.893
Color ASTM D1500 — 8− 1− 8+ 2.5
Pour point °C −9 −6 −9 −6
Viscosity at 40°C cSt (10
−6
m
2
/s) 49.39 47.39 377 373.48
Viscosity at 100°C cSt 7.12 7.00 25.40 25.10
Viscosity index — 101 104 89 88
Total nitrogen ppm 180 65 375 217
Sulfur % w/w 0.47 0.182 0.786 0.443
Chlorine ppm 45 0 20 0
Phosphorus ppm 15 0 15 0
Conradson carbon % w/w 0.08 0.014 0.60 0.39
Flash point open cup °C 231 220 332 309
Neutralization
number
Total acid mg KOH/g ...