Alkaline earth metal-containing hydrated alumina composition, molded body, preparation method and application, catalyst and preparation method

Abstract

The invention discloses an alkaline earth metal-containing hydrated alumina composition, a molded body, a preparation method and application, a catalyst and a preparation method. The composition contains hydrated alumina, a compound with at least two proton acceptor sites and an alkaline earth-containing hydrated alumina composition. Metal compounds, the value of this composition is 5 or less. The invention also discloses a catalyst with a hydrogenation catalytic effect using a molded body formed of the alkaline earth metal-containing hydrated alumina composition 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, and when preparing the molding raw material, there is no need to introduce additional water to the molded body. Boehmite dry glue powder is prepared into formable materials, which simplifies the overall process flow, reduces overall operating energy consumption, and avoids dust pollution caused by using pseudo-boehmite dry glue powder as raw material, which greatly saves Improved working environment.

Description

Technical field [0001] The present invention relates to the technical field of alumina molding. Specifically, the present invention relates to an alkaline earth metal-containing hydrated alumina composition and a preparation method thereof. The present invention also relates to an alkaline earth metal-containing hydrated alumina formed from the alkaline earth metal-containing hydrated alumina Aluminum molded body and alumina molded body. The present invention further relates to a catalyst with hydrogenation catalysis using a molded body formed from the alkaline earth metal-containing hydrated alumina composition as a carrier, a preparation method thereof, and a catalyst using the catalyst Hydroprocessing method. 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 better pore structure, suitable specific surface area and higher heat resistance. Carrier...

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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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