Yazan Munaf Ali’s scientific contributions

Production of low sulfur content of untreated naphtha from Al -Qayarah Refinery units has been studied in this research by using oxidation, oxidation-adsorption, and adsorption methods. The influence of time, temperature, sorbent type on sulfur reduction was investigated. The results showed that oxidation- adsorption was an efficient method for the desulfurization of naphtha where high removal efficiencies of about 93% were obtained. Also, it was concluded that by increasing temperature (up to 60C), and time (up to 5 hr) led to decreasing sulfur content from 1194ppm to about 76ppm. The results indicated that the best sequence of sulfur removal on sorbent materials were as follow: Ni/AC˃ AC ˃ Ni/γAl2O3˃ γAl2O3.

The present research investigates hydrodesulfurization (HDS) and hydrodearomatization (HAD) of raw kerosene with 0.364 wt. % sulfur and 16.498 wt. % aromatics supplied from Al-Dura Refinery. Hydrotreating reactions were carried out in one stage reactor over high metal Ni W/γ-Al2O3 prepared catalyst at different temperatures 275-350oC, pressures 32-62 bar, LHSV 1-4 hr-1, and H2/HC ratios 200-500. The prepared catalyst was pre-sulfided remarkably at low temperature and high pressure to avoid risky of sintering associated with gaining the active sulfide phase at high temperatures. Results showed an obvious differences between HDS and HAD rates due to difficulty of polyaromatics saturation compared with desulfurization. Sulfur and aromatics removal were achieved from 74.9% to 95.6% and from 1% to 12.8% respectively at different operating conditions. Advanced saturation conditions were promoted the hydrogenation reaction bath and played a significant role for achieving acceptable levels of HDS and HDA. In general, HDS and HDA increased with decreasing LHSV and increasing temperature, pressure, and H2/HC ratio. Burning quality, fire hazard, and aromatics content of kerosene were characterized by measuring of smoke point, flash point, and aniline point respectively. These properties were enhanced at different hydrotreating conditions due to the skeletal conformation change of kerosene hydrocarbons during reactions.