Hydrotreating of vacuum gasoil in mixture with delayed coking products on industrial NiMo/Al2O3 catalyst

Abstract

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.

Development, Status, and Prospects of Coal Tar Hydrogenation Technology

“…The process converts the heavy ends of coal tar into light‐fraction oil and coke by delayed coking and the light‐fraction oil is hydro‐treated to produce naphtha and diesel products. The process is classified into the delayed coking tar hydrogenation of full‐range coal tar and heavy distillate …”

“…Thep rocess is classified into the delayed coking tar hydrogenationo ff ull-rangec oal tar and heavy distillate. [18,19]…”