
190 Refining Used Lubricating Oils
TABLE 7.19
Exxon Process: Effect on Distillate Quality of Pilot Heat Soaking Before WFE
(Pope Pilot Plant) Distillation of Dewatered/Defueled Oil from Table 7.17
Luwa Dewatered/Defueled Oil
Heat soaking None Yes (pilot plant)
Temperature, °C — 280 320
Residence time, h — 1.0 1.0 0.5 1.0 2.0
WFE (Pope) Distillation
Temperature, °C 289 292 289 289 292 298
Pressure, kPa 0.5 0.4 0.4 0.5 0.4 0.4
Phosphorus, ppm 240 25 6/3 8 6/3 5
Sludge, ppm at 310°C 2030 450 490 460 490 390
Source: Exxon US Patent 4,512,878.
TABLE 7.17
Exxon Process: Continuous A&V Distillation Dewatering/
Defueling of Used Oil (Feedstock B in Table 7.15)
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