58 / 222
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
51
41
Fig (5) - Mohawk Process with Hydro-treater - Source 1
However, Mohawk and Chemical Engineering Partners (CEP) later combined to
use the initial stages of the Mohawk process and adding a hydro-treating stage of
three reactors in series operating at a pressure of 1300 psig and 315
o
C to reduce
sulpher and other contaminants and to improve base oil yield to the level of group
II base stocks as shown in Fig (6).
CEP's leading technology since 1988 is said to produce API Group II quality base
oil with recoveries in excess of 70%
93
. CEP licenses a number of re-refining
plants where ten are operational globally and two more in design, approaching
nearly a total of billion litres of re-refining capacity
93
which can produce Group
II base oils.
The minimum economic size, according to CEP
1
, is 15 thousand tons a year and
the yield of base oil is 74%, 4% light oil, 4% gasoil and 13% asphalt, a great
improvement over the original Mohawk. The process is used in Canada, USA and
Finland, Australia (20 thousand tons a year) and Indonesia (50 thousand tons a
year Mohawk).
Fig (4) Sotulub Process. Source: 1