Hydrogenation protection catalyst, preparation method and application thereof, and hydrocarbon oil hydrotreatment method

Abstract

The invention relates to the technical field of hydrocarbon oil hydrogenation, and concretely discloses a hydrogenation protection catalyst, a preparation method and an application thereof, and a hydrocarbon oil hydrotreatment method. The catalyst contains a carrier and hydrogenation active components supported on the carrier, and the carrier is obtained through forming a hydrated alumina composition having a phi value being 1.8-5 and containing hydrated alumina, a compound having at least two proton acceptor sites and an alkali earth metal-containing compound. The invention also discloses thehydrocarbon oil hydrotreatment method using the catalyst. The carrier of the catalyst, having a high strength, is prepared from hydrated alumina wet gel, so the step for drying the hydrated alumina wet gel is omitted, the total process flow is simplified, the total operating energy consumption is reduced, and dust pollution initiated by pseudo-boehmite dry glue powder used as a raw material to prepare the carrier is avoided. The catalyst has a high catalytic activity, and can effectively reduce the content of metal impurities in hydrocarbon oil and prolong the service life of a hydrogenationcatalyst main agent.

Description

technical field [0001] The present invention relates to the technical field of hydrocarbon oil hydrogenation. Specifically, the invention relates to a hydrogenation protection catalyst and its preparation method and application. The invention also relates to a hydrocarbon oil hydrogenation treatment method using the hydrogenation protection catalyst. Background technique [0002] In the traditional catalyst preparation method, alumina shaped body, especially γ-alumina shaped body, is often used as the carrier of supported catalyst because of its good pore structure, suitable specific surface area and high heat resistance stability. use. This kind of alumina is usually obtained from dried hydrated alumina, such as pseudo-boehmite, which is shaped, dried, and then calcined at high temperature. [0003] Based on the above understanding, if figure 1 As shown, the prepared hydrated alumina wet gel needs to be dried to obtain pseudo-boehmite dry rubber powder, and then the pseud...

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Problems solved by technology

[0014] (1) Pseudo-boehmite that has not been completely dried has strong viscosity, is difficult to transfer, and easily causes secondary dust pollution;

[0015] (2) Drying starts from the surface. The drying of the wet solid product separated from the mixture obtained from the gelling reaction is incomplete drying, so there is a sandwich biscuit phenomenon, that is, the surface of part of the pseudo-boehmite is dried (that is, the dried surface is substantially free of free water), while the interior is still wet (that is, for the non-dried interior, the content of free water is basically maintained at the level before drying), since the surface is dried, Therefore, hard particles are formed. When peptizing agent and / or binder are added to this incompletely dried pseudo-boehmite and kneaded, the hard particles formed during the drying process are in the process of extrusion. It is easy to cause blockage and affect production efficiency;

[0016] (3) It is difficult to stably control the dry base of pseudo-boehmite. The instability of the dry base will cause great interference to the molding process, making the molding process very unstable, resulting in an increase in the amount of unqualified products and low production efficiency;

[0017] (4) CN103769118A adopts a conventional molding process when molding, yet because the dry basis (35%-50%) of the pseudo-boehmite it adopts is far lower than the conventional dry basis content (about 70%), that is The water content is high, and there is basically no extrusion pressure during the extrusion molding process. Therefore, the carrier obtained after the extrudate is dried and roasted has basically no mechanical strength. As long as a little external force is applied, it will be pulverized and has no possibility of industrial application. sex, which is the biggest problem facing the technology

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