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2016
أوابك العلمية لعام
�
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
25
Figure 12 Revivoil simplified process flow diagram
Source: Petder (2012)
4.6
STP Process
STP (Studi Tecnologie y Progetti) is the supplier of this re-refining technology which is
based on thin film evaporation and hydrofinishing.
4.6.1
Process description
The basic steps of the process are as follows:
Dehydration and lights removal:
The stocked used oil is pumped through a filter and preheated through heat exchangers
which help in recovering heat from finished products. It is then treated with chemical
additives. The treated oil is flashed in the flash drum to remove water and light
hydrocarbons. Gases are burnt in a thermal oil furnace. Water and hydrocarbons are
condensed and separated in a settler.
Flash
VGO
Water, light
hydrocarbons
Fresh H2
Flash
Amine
absorber
Light hydrocarbons
Stripper
Fractionation
column
Hydrogenation
reactor
Asphaltenes
Re-refined base oil
Regenerated amine
Used amine
Recycled H2