64 / 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
57
47
Fig (11) - The KTI Process - Source 1
The top stream is oil vapour which is condensed before entering a hot soak vessel
where heavy impurities settle and recycled back to the front end of the wiped film
evaporator. The hot soak vessel operates at 150 to 250
o
C and the residence time
is 11 to 30 hours depending on the quality of the feedstock. The overflow of the
hot soak vessel joins the gasoil stream and goes into the catalytic hydro-treating
reactor operating at 320
o
C and 870 psi pressure to reduce or eliminate the
impurities of metals, sulpher, nitrogen, chlorine and oxygen. The rest is to
separate and recycle the hydrogen and a fractionation tower finally to separate
the diesel, light and heavy base oils. The KTI Process recovers over 95% of lube
oil components, much higher than other conventional processes though some
sources quote 82%
4
.
Like in other processes, the hydrofinishing step is capable of destroying PCBs
and other similar carcinogenic contaminants. The waste water is treated according
to local regulation of the plant. The base oil quality is equal or better than virgin
base stocks.