Alumina shaped body, preparation method and application thereof, catalyst, preparation method and hydrotreating method

Abstract

The invention discloses an alumina shaped body and its preparation method and application. The preparation method includes hydrated oxidation of boron-containing alumina containing hydrated alumina and a compound with at least two proton acceptor sites and a value of 1.8-5. The shaped object of the aluminum composition is optionally dried and then fired in an oxygen-containing atmosphere in the presence of water vapor. The invention also discloses a catalyst with hydrogenation catalysis using the alumina shaped body as a carrier, a preparation method and a hydrogenation treatment method. The present invention uses hydrated alumina wet gel as the starting material to prepare a molded body with higher strength, omitting the step of drying the hydrated alumina wet gel. When preparing the molding raw material, there is no need to introduce additional water to dry the glue. The powder is modulated into formable materials, which simplifies the overall process flow, reduces the overall operating energy consumption, avoids dust pollution caused by using pseudo-boehmite dry glue powder as raw material, and greatly improves the operating environment.

Description

technical field [0001] The present invention relates to the technical field of alumina molding. Specifically, the present invention relates to an alumina molding and its preparation method and application. The present invention also relates to a catalyst using the alumina molding as a carrier and its preparation method. The present invention further relates to a hydroprocessing method using the catalyst. Background technique [0002] In traditional methods, alumina shaped bodies, especially γ-alumina shaped bodies, are often used as adsorbents or supported catalysts because of their good pore structure, suitable specific surface area and high heat resistance stability. carrier used. 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 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, which is not suitable for industrial applications. possibility, which is the biggest problem facing the technology

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