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أوابك العلمية لعام
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ص لبحوث العلمية الفائزة بجائزة
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عدد خا
مجلة النفط والتعاون العربي
161
العدد
- 2017
أربعون
المجلد الثالث و ال
Re-refining of Used Lubricating Oil and its Economic and Environmental Implications
39
temperature of 400ºC. The oil obtained in this stage is free of solid impurities, and metal
and other elements.
Discoloration and purification stage:
At this stage, the visual appearance of the base oils is improved. The chlorinated
compounds are removed through the addition of Sodium.
The simplified process flow diagram is illustrated in Figure 22
4.15.2
Process features and drawbacks
It is claimed that it is a high performance process in which control of the temperature is
highly important for obtaining the required results. The process is considered to be
clean technology according to the IACT (International Association for Clean
Technology). The TÜV analysis (Technische Überwachungsverein) shows the total
elimination of PCBs. The main drawback is the handling of sodium, which is complex
and hazardous.
Figure 22 ENTRA simplified process flow diagram
Source
: Audibert (2006)
Waste
oil
Fuel
gas
Diesel oil
Base oil
Spindle
Fuel
Vacuum
towers
Fuel
Tubular
reactors
Clay
Sodium