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مجلة النفط والتعاون العربي
161
العدد
- 2017
أربعون
المجلد الثالث و ال
2016
أوابك العلمية لعام
�
ص لبحوث العلمية الفائزة بجائزة
�
عدد خا
50
40
Fig (4)
–
Sotulub Process
–
Source 1
the reboiler can be replaced by a centrifuge to separate the asphalt and heavies
3.
The base oil yield
is 62.76%
1
.
Two units are reported, one in Tunisia at 16 thousand tons a year and in Kuwait
at 20 thousands. But Tunisia is said to have added another stage later to hydro-
treat the products and improve the quality.
The Mohawk and CEP Mohawk Process:
1, 3, 107
In the early 1980s, a plant was constructed in Vancouver, Canada at 600 barrels
a day to treat used oil by subjecting it to a chemical treatment by a hydroxide or
a combination of this and a weak acid. Water and gasoline are then removed by
flash distillation and then gasoil is removed by vacuum distillation. The final step
uses another vacuum step and a thin film evaporator to get the base oil cuts and
bottom’s asphalt combined with the unwanted contaminants. The yield of base
oil is 65%. A hydro-treating step can be added for the full base oils cut before
final distillation breaks them into the desired cuts of Group I base oils as shown
in Fig (5).