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البحـث الأول
مجلة النفط والتعاون العربي
161
العدد
- 2017
أربعون
المجلد الثالث و ال
2016
أوابك العلمية لعام
�
ص لبحوث العلمية الفائزة بجائزة
�
عدد خا
47
37
Fig (2) Alternative Virgin Base Oil Processing Source: 2
Used Oils Re-refining Processes:
Since base oils are not actually destroyed by use but get contaminated, the
question of re-refining them may be called a cleaning process.
The first important step is testing the collected used oils “to ensure quality
because used lubricating oil from a wide variety of sources may contain chemical
or physical contaminants that are hazardous or prevent that oil from being used
in the re-
refining process.”
1
This also relate to different regulations around the
world.
Generally, the re-refining processes involve similar steps such as:
1-
Filtration and settling of the collected oil.
2-
Removing water and light hydrocarbons from the feed by pre-flash
distillation.
3-
Removing gasoil by feeding to a vacuum column.
4-
Rejecting heavy materials and contaminants by vacuum distillation or
wiped film evaporation or both.
5-
Treating the remaining oil with solvent or hydrogen to get base stocks
close to virgin oils.
Generally, there are three major categories of processes to treat used lubricating
oils: