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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
53
43
The process does not cause pollution except for some solvent losses and produces
relatively good quality base oils. Avista Oil Company owns and operate a 35
million gallons a year re-refinery in the US and another three plants in Saudi
Arabia (2003) and one in Denmark (2008).
Fig (7) - Avista Process - Source 3
Viscolube and the Revivoil Process:
1, 15, 87
Fig (8). The original Viscolube process is an example of chemical treatment,
distillation and clay. After settling and filtration the used oil feed is treated with
30% caustic soda (sodium hydroxide) solution to neutralize fatty acids and
chlorides before water and light hydrocarbon removals are made in a pre-flash
tower operating under vacuum and 120 to 140
o
C. The bottom of the pre-flash
column goes to a settling tank where impurities are removed before the used oil
is heated to 360
o
C and flashed in a deasphalting and fractionating vacuum tower
with a cyclone separator in its bottom. The side streams of base oils are stripped
by steam in in the next columns and treated by clay to remove odour and improve
colour. The light products can be used as fuel in the plant. The process is a