63 / 222
مجلة النفط والتعاون العربي
161
العدد
- 2017
أربعون
المجلد الثالث و ال
2016
أوابك العلمية لعام
�
ص لبحوث العلمية الفائزة بجائزة
�
عدد خا
56
46
Fig (10) - Snamprogetti Process - Source 1, 3
The heavy base oil can be separately heated and recycled in batch mode to the
solvent extraction stage to improve the cut.
The base oil yield is 87%. The hydro-treater operates at 250 to 450
o
C and the
hydrogen is reported to be between 15 and 850 normal litres/litre
1
of oil. One
plant of 55 thousand tons a year is in Italy.
The Kinetic Technology International (KTI) Process:
1, 4, 67, 107
Fig (11). Patented in 1990, this process passes settl d and filtered used oil into a
distillation column to separate water and light hydrocarbons, which are used as
process fuel or burned in a special incinerator (not shown in the diagram). The
pre-treated oil is then passed into a predistillation column operating under
vacuum and 220
o
C to remove a gasoil stream.
The bottom is partially re-boiled and sent back to the predistillation column and
the other part goes in to a wiped film evaporator operating under very low vacuum
and 345
o
C. The bottom stream of the wiped film evaporator is an asphaltic residue
carrying some contaminants and is partially recycled.