
160 Refining Used Lubricating Oils
TABLE 7.2
Sotulub Process: Processed without Strong Base Pretreatment
Distillation Yield = 62.35%
Product
Yield
(%)
Acidity
(TAN) mg
KOH/g
Viscosity
cSt at
40°C Color Appearance
Gas oil 6.99 4.70 3.70 5 Cloudy
Light cut 12.40 0.10 30.57 <4 Cloudy
Heavy cut 49.95 0.41 75.98 4.5 Cloudy
Residue 20.27 — — — —
Water + gasoline +
losses (dist.)
10.39 — — — —
Metals content Ba Ca Pb Zn P Cr Fe Si
Used oil 8 692 1138 694 704 5 84 77
Light cut <2 <1 6 <1 8 <0.5 <0.5 26
Heavy cut <2 <1 5 <1 <5 <0.5 <0.5 6
Gas oil <2 <1 39 2 101 <0.5 8 327
Residue 85 4901 2529 3469 2570 36 652 228
Source: Sotulub Patent Fr 93 03275.
TABLE 7.3
Sotolub Process: ...