Hydrotreating of Qaiyarah deasphalted residue

✍ Scribed by Abdul-Halim A.-K. Mohammed; Hussain H. Al-Soufi; Karim H.N. Losan; Ihsan Najeeb

• Publisher: Elsevier Science
• Year: 1988
• Tongue: English
• Weight: 451 KB
• Volume: 67
• Category: Article
• ISSN: 0016-2361
• DOI: 10.1016/0016-2361(88)90009-9

✦ Synopsis

Qaiyarah reduced crude (QRC), which constitutes 70.5 wt y0 original crude oil, was deasphalted with npentane under specified conditions. The deasphalated oil (64.4 wt % of QRC) with sulphur content 4.2 wt % was hydrotreated on commercial Co-MO-alumina catalyst on a trickle-bed reactor. The temperature varied from 34&4oo"C with liquid hourly space velocity (LHSV) ranging from 0.69-2.9 h-l. Hydrogen pressure was kept constant through the experiment at 8.0 MPa, with a hydrogen/oil ratio of about 300 v/v. The hydrodesulphurization reaction of the deasphalted oil followed second-order kinetics. Desulphurization rate constants were calculated using a second-order equation (k) and a model comprising two parallel first-order reactions (k, and k,). The apparent activation energy (E,) was calculated based on the values of k, k, and k2.

A study of the change in saturates, aromatics and polar aromatics of feedstock and hydrotreated products during the hydrotreatment process indicates that the saturates increase significantly while the aromatics plus polar aromatics decrease.