Analysis and deep hydrodesulfurization reactivity of Saudi Arabian gas oils

Taegon Kim, Syed Ahmed Ali, Khalid Alhooshani, Joo Il Park, Mohammed Al-Yami, Seong-Ho Yoon, Isao Mochida

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Gas oils obtained from Arabian Light (AL-GO), Arabian Medium (AM-GO) and Arabian Heavy (AH-GO) crude oils were subjected to detailed analysis in terms of reactive and refractory sulfur, nitrogen, as well as aromatic species. Deep hydrodesulfurization (HDS) of these gas oils over SiO2-Al2O3-supported CoMo and NiMo catalysts was studied using autoclave reactor either in one- or two-stage operations. AL-GO was easily and deeply desulfurized to 15ppm over CoMo/Al2O3-SiO2 (catalyst X) at 340°C and 5MPa (H2) for 2h. At the same conditions, AM-GO and AH-GO could be desulfurized to 70 and 78ppm, respectively. Two-staged HDS, by combining CoMo and NiMo catalysts, in successive steps resulted in effective deep HDS. The replacement of hydrogen atmosphere after the first-stage (1h) enhanced the AH-GO HDS during the second-stage (1h) to 9ppm. However, replacing the hydrogen in the second-stage with 5% H2S in hydrogen inhibited the HDS, resulting in product sulfur content of 15ppm. Analysis of sulfur species indicate that significant fraction of reactive and refractory sulfur species were removed during the first-stage whereas the remaining refractory sulfur species were removed during the second-stage. Kinetic analysis indicates overwhelming influence of refractive sulfur species on the overall HDS. The results from this study show that two-stage scheme with optimum catalysts in series can be applied to overcome the difficulty to achieve deep HDS of AH-GO.

元の言語英語
ページ(範囲)1577-1582
ページ数6
ジャーナルJournal of Industrial and Engineering Chemistry
19
発行部数5
DOI
出版物ステータス出版済み - 9 25 2013

All Science Journal Classification (ASJC) codes

  • Chemical Engineering(all)

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