Method for preparing sulfurization type hydro-cracking catalyst

Abstract

The invention discloses a preparation method of a sulfurization type hydro-cracking catalyst. The preparation method comprises the following steps: selecting a hydro-cracking catalyst carrier component, wherein the carrier component at least comprises a molecular sieve and an amorphous acidic component; adding water into the carrier component powder, pulping so as to obtain slurry (c), then adding sulfo-molybdate and/or sulfo-tungstate slurry (a) and a nickel salt and/or cobalt salt solution (b) into the slurry (c), adding a surfactant at the same time, evenly mixing, filtering, washing, and drying in the protection of inert gas, adding an adhesive, kneading, forming, and finally drying and burning in the protection of inert gas so as to obtain the sulfurization type hydro-cracking catalyst. The preparation method makes the active metal be evenly distributed on the carrier so as to generate more II type Ni(Co)Mo(W)S active phases with a higher activity; thus the catalyst has a high sulfurization degree and a high utilization rate of active metal, the hydrogenation activity and acidity of the catalyst are more reasonably matched, so the hydrogenation activity and selectivity of the catalyst are both improved.

Description

technical field [0001] The invention relates to a preparation method of a sulfurized hydrocracking catalyst. Background technique [0002] In recent years, with the decrease of oil reserves, the rising international oil price, and the trend of heavy and inferior crude oil becoming more and more serious, the market demand for high-quality middle distillate products continues to increase. Therefore, it is particularly important to increase the production of middle distillates, increase the ratio of diesel to gasoline, and improve the contradiction between supply and demand. The key to solving this contradiction lies in the development of hydrocracking catalysts with high selectivity for middle distillates. Most of the metal active components of the current industrialized hydrocracking catalysts exist in the form of oxides, but in actual use, the active metal oxides on the catalyst need to be converted into sulfides. Therefore, the catalysts need to be sulfurized or Called pre...

AI Technical Summary

Problems solved by technology

[0003] Conventional catalyst vulcanization methods use "in-vessel" vulcanization or "in-situ" vulcanization, that is, the catalyst in the oxidized state is first loaded into the hydrogenation reactor, and then hydrogen and sulfurizing agent are introduced into the reactor during the process of continuous heating. Pre-sulfurization, this method brings the following problems: (1) special pre-sulfurization equipment should be set up on the hydrogenation unit; (2) the vulcanizing agent added during the vulcanization process and the water and hydrogen sulfide generated by the reaction can easily cause high pressure Corrosion of reactors and related equipment, resulting in equipment damage and potential safety hazards; (3) The vulcanization process is longer, delaying the start-up time

(4) The vulcanizing agent used is flammable and toxic, and pollutes the environment during the vulcanization process; (5) The cost of pre-vulcanization in the device is relatively high

The above-mentioned methods all carry out pre-sulfurization treatment to the ready-made oxidized catalyst, so there are following deficiencies in the preparation process: the oxide MoO of hydrocracking catalyst active metal Mo, W, Co, Ni 3 、WO 3 , CoO, NiO have a strong interaction with the surface of the support, resulting in difficult and incomplete sulfidation of the active metal component, reducing the hydrogenation activity of the catalyst, and causing serious environmental pollution during the sulfidation process

The process is simple and the degree of sulfidation is high, so that the prepared sulfide hydrocracking catalyst has high activity and selectivity, but the catalyst prepared by kneading method has poor metal dispersion uniformity and low metal utilization rate, which affects the activity of the catalyst. and product properties