Study of the Influence Exerted by Addition of Coker Gas Oil to Straight-Run Gas Oil on the Process of Hydrotreating in the Presence of CoMo/Al2O3 Catalyst

• Published in: Russian journal of applied chemistry 2019-08, Vol.92 (8), p.1077-1083
• Main Authors: Aleksandrov, P. V., Bukhtiyarova, G. A., Reshetnikov, S. I.
• Format: Article
• Language: English
• Subjects: Additives; Aluminum oxide; Catalysis; Catalysts; Chemistry; Chemistry and Materials Science; Chemistry/Food Science; Dilution; Gas oil; Hydrodesulfurization; Industrial Chemistry/Chemical Engineering; Raw materials; Sulfur
• ISSN: 1070-4272; 1608-3296
• DOI: 10.1134/S1070427219080044

Behavior of the CoMo/Al 2 O 3 catalyst was experimentally studied in the course of hydrotreating of a straight-run gas oil with high content of sulfur (>2 wt %) and its mixture (up to 30 wt %) with light coker gas oil in the temperature range 335–365°C and liquid hour space velocity of feedstock deliver of 0.8–2.5 h −1 . It was shown that addition of gas oil to the straight-run gas oil in hydrotreating under the conditions corresponding to the working conditions of the existing domestic hydrotreating installations [L-24-5, L-24-6, L(Ch)-24-7] has oppositely directed effects, depending on temperature and feedstock delivery rate. For example, the additives lead in the temperature range 335–350°C to an increase in the content of sulfur in hydrotreating products. At a temperature of 365°C, better sulfur-related parameters are reached in processing of feedstocks containing light coker gas oil. The observed dependences are accounted for as follows: the dilution of the straight-run gas oil by addition of light coker gas oil leads to a decrease in the content of difficulty converted sulfur-containing compounds, but makes larger the content of nitrogen-containing compounds inhibitors of the hydrodesulfurization reaction, the influence of which on the reaction rate becomes weaker with increasing temperature.