Effect of Sulfur Compound Addition on Hydrodesulfurization of Coker Gas Oil

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  • Takahashi Takeshige
    Dept. of Applied Chemistry and Chemical Engineering, Faculty of Engineering, Kagoshima University
  • Harada Yoshiko
    Dept. of Applied Chemistry and Chemical Engineering, Faculty of Engineering, Kagoshima University
  • Ueki Masaru
    Dept. of Applied Chemistry and Chemical Engineering, Faculty of Engineering, Kagoshima University
  • Kai Takami
    Dept. of Applied Chemistry and Chemical Engineering, Faculty of Engineering, Kagoshima University

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  • 熱分解重質軽油の脱硫に及ぼす硫黄化合物添加の影響
  • ネツ ブンカイジュウシツ ケイユ ノ ダツリュウ ニ オヨボス イオウ カゴウブツ テンカ ノ エイキョウ

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Abstract

To clarify the effect of sulfur compound addition on catalytic activity and catalyst deactivation, hydrodesulfurization (HDS) of coker gas oil (CGO) was carried out over demetallation catalysts, metal tolerant desulfurization catalyst and desulfurization catalysts. The initial HDS constant and catalyst life were slightly improved by the addition of 1000 ppm of dimethyldisulfide (DMDS), probably by the prevention of coking on the catalyst surface. The CH3S radical formed via thermal decomposition was important in the suppression of recombination of heavy hydrocarbon radicals which results in coke or coke precursor formation. The addition of small amounts of sulfur compounds to the CGO is expected to reduce coke formation during the early stages of HDS.<br>

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