Мо and Co-Mo catalysts for processes of hydrodesulfurization and hydrogenation of aromatic hydrocarbons in the composition of kerosene, deasphaltisate and natural gas are considered.
BACKGROUND:The relationship between the chemical composition, texture, and the shape of the granules of the protective bed upstream hydrotreating, that influences the degree of metal removal from the residual vacuum gas oil, is a critical issue in oil refining.
RESULTS:The character of the metal and sulphur distribution on the surface and in the volume of granules of the protective beds was studied for the model mixtures enriched with typical compounds deactivating hydrodesulphurization catalysts. The protective bed was operated along with the demetallization catalyst synthesized using local mineral raw materials (e.g., Angren high-quality enriched kaolin) and production wastes (spent alumina sorbent from Shurtan gas chemical complex).CONCLUSION: It is shown, the use of a two-bed protective system most effectively extended the life-time of the main hydrotreating catalyst. The spent and deactivated Al-Co-Mo catalyst can be efficiently used in the synthesis of the catalyst used for the pre-cleaning upstream hydrotreating.
The dynamics of the accelerated formation of corrosion products of equipment in the process of obtaining diesel and oil fractions from sour oil with a high concentration of resinous asphaltic substances and derivatives of petroleum acids are investigated in this work. The following experimental data is obtained: the genesis of the phase composition during the synthesis of granules of the protective layer from kaolin phosphate mass, followed by their modification with Ni 2+ ions in order to control the surface acidity and the hydrogenating function focused on the conversion of reactive alkenes. The mechanism and conditions for the formation of samples of catalysts of the protective layer of the core type contain ing the weight of 2.5%, are discussed. NiO in the surface layer, and 5 times less in the inner part of the granules which consist of particles of clay mineral cemented Al (H 2 PO 4) 2 , as well as other products of dissolution of kaolinite and hydromica with phosphoric acid, are also studied. The results of the study of the efficiency of removal of corrosive iron and impurity elements of petroleum origin in granules of the developed protective layer are presented. It has been established that the use of granules of a protective layer in optimal shape and size, together with a reduced tendency to form a solid crust of sediments, limited the increase in pressure drop on the layer of CoMo catalyst of hydrofining oil distillates and the deasphalted vacuum residue of highsulfur tarry oil.
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