Preparation method of hydrofining catalyst for high-activity coker gasoline

Abstract

The invention discloses a preparation method of a hydrofining catalyst for high-activity coker gasoline. The preparation method is characterized in that the hydrofining catalyst is prepared by one-time co-impregnation roasting of a TiO2-Al2O3 carrier and an impregnating solution; the carrier employs a TiO2-Al2O3 composite carrier; the impregnating solution contains elements of Mo, Ni, W, Co, P and Mg, and additives; after impregnation roasting, a Mo-Ni-W-Co-Mg-P / TiO2-Al2O3 hydrotreating catalyst with specific surface area of 150-250 m<2> / g, pore volume of 0.3-0.8 ml / g, pore size of 6-11 nm and strength higher than 120 N / cm is obtained. The TiO2, MgO and additives added in the hydrotreating catalyst can enhance dispersion and stability of the active metal elements, so that the catalyst gains high hydrogenation activity, enables the coker gasoline to carry out hydrofining at lower reaction temperature, slows the rate of coking and has good desulfurization and denitrification effects.

Description

technical field [0001] The invention belongs to the hydrofinishing technology of petroleum hydrocarbon products, and relates to a method for preparing a highly active coking gasoline hydrofinishing catalyst. Background technique [0002] Delayed coking is a process in which residual oil undergoes a deep thermal conversion reaction under relatively high reaction temperature and reaction time to generate coking gas, coked diesel oil, heavy distillate oil and petroleum coke. Delayed coking is currently the most important means of heavy oil processing, and its purpose is to decarbonize the residual oil and obtain distillate oil to the maximum extent. Coking gasoline is a distillate of delayed coking. Compared with straight-run gasoline, it has higher sulfur, nitrogen, and olefin content, and its nitrogen content is about 100 times that of straight-run gasoline, and its shape is more complex. With continuous expansion, the output of coker gasoline is expanding. For this reason, ...

AI Technical Summary

Problems solved by technology

The coking gasoline hydrofining catalysts currently used are all general hydrofining catalysts, but due to the high content of sulfur, nitrogen and olefins in coking gasoline, the bed is easy to coke during hydrogenation, and the pressure drop of the bed rises too fast. Catalyst life shortened

CN100998952A prepared a coker gasoline hydrorefining catalyst containing Mo, W, Ni and P. The catalyst has a high metal content and has good low-temperature activity when the coker gasoline is refined and processed, and can reduce the inlet temperature of the reactor. The reaction of olefin saturation, desulfurization and denitrogenation is carried out at low temperature, the coking speed is slow, and the regeneration period is long. However, the catalyst is prepared by the double impregnation method, the preparation process is cumbersome, and the desulfurization and denitrogenation effects are not good at lower temperatures.

CN1990830A discloses a method for hydrofining of coker gasoline. In this method, the raw material oil is mixed with hydrogen and enters into a low-temperature reaction for reaction, and the reaction effluent enters a high-temperature reactor for reaction after heating up in a heating furnace to obtain refined gasoline fractions , this method reduces the coking speed and prolongs the catalyst life, but this method changes the entire hydrogenation process