Vacuum residue of Jumboor crude oil above 773 K of specific gravity 1.105 and 6. I wt% sulfur , was treated with commercial pentane &hexane fractions for preparing deasphaltened oil (DAO) suitable for hydrodesulphurization process. Solvent deasphaltening was examined with mixing time 0.25 to 4 h and solvent to oil ratio 4 to 15 ml : 1g at different temperatures . The asphaltenes yield was decreased with increasing mixing time and increased with increasing solvent to oil ratio . Hexane deasphaltened oil hydrotreated on presulfided commercial cobalt-molybdenum alumina catalyst at specified operating conditions in a trickle bed reactor . The hydrotreating process applied at a range of temperatures varied from 623 to 698 K, liquid hourly space velocity (LHSV) from 0.7 to 2.2 h-1 ,H2/oil ratio about 300 liter/liter and hydrogen pressure was 4 Mpa . The results of hydrotreating process indicate high sulfur and metal removal with decreasing LHSV as well as high temperature applied . The kinetic of hydrodesulphurization and demetalization reactions followed 2nd and 1st order reactions respectively .

In Trickle Bed Reactor Basrah crude oil was hydrotreated using a common hydrotreating catalyst (Co-Mo/γ-Al2O3) . The operating conditions of this treating was, temperature (600 – 675 K) , Liquid hourly space velocity (LHSV) (0.6 – 1.9 hr-1) , constant pressure (3 Mpa) and H2/Oil ratio 300 L/L were performed. Experiments results show that aromatic content was reduced as temperature increases and LHSV decreases, as well as the aromatic saturation were greatly enhanced at the same condition .

The aim of this research is to study the kinetic reaction models for catalytic hydrogenation of aromatic content for Basrah crude oil (BCO) and vacuum gas oil (VGO) derived from Kirkuk crude oil which has the boiling point rang of (611-833)K. This work is performed using a hydrodesulphurization (HDS) pilot plant unit located in AL-Basil Company. A commercial (HDS) catalyst cobalt-molybdenum (Co- Mo) supported in alumina (γ-Al2O3) is used in this work. The feed is supplied by North Refinery Company in Baiji. The reaction temperatures range is (600-675) K over liquid hourly space velocity (LHSV) range of (0.7-2)hr-1 and hydrogen pressure is 3 MPa with H2/oil ratio of 300 H / l 2 of Basrah Crude oil (BCO), while the corresponding conditions for vacuum gas oil (VGO) are (583-643) K, (1.5-3.75) hr-1, 3.5 MPa and 250 H / l 2 respectively . The results showed that the reaction kinetics is of second order for both types of feed. Activation energies are found to be 30.396, 38.479 kJ/mole for Basrah Crude Oil (BCO) and Vacuum Gas Oil (VGO) respectively.