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To examine the infl uence exerted on the degree of hydrogenation and hydrogenolysis by the content of olefi n (diolefi n) and polycyclic aromatic hydrocarbons at different fractional compositions of distillate mixtures, joint hydrotreating of vacuum gasoil with benzine and light and heavy coking gasoils was performed. The study was carried out in a laboratory installation under a hydrogen pressure of 5.0 MPa, temperature of 375°C, volumetric fl ow rate of raw materials of 1 h -1 , and H 2 /raw material ratio of 1000/1. The effect of the composition of raw materials and process conditions on the chemical composition and quality parameters of the resulting products was demonstrated. It was shown that a pronounced competition between olefi n and polycyclic aromatic hydrocarbons in hydrogenation reactions is observed for mixtures of heavy vacuum gasoil and light coking gasoil, in contrast to mixtures of straight-run diesel fraction and light coking gasoil.

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