Alumina shaped body and its preparation method and application as well as catalyst and its preparation method and hydrotreatment method

Abstract

The invention discloses an alumina formed body, a preparation method and an application thereof, and a production forming system. The preparation method comprises the following steps: optionally drying a formed body of a silicon-containing hydrated alumina composition having a phi value being 5 or less and containing hydrated alumina, a compound having at least two proton acceptor sites and a silicon-containing compound, and calcining the dried formed body in an oxygen-containing atmosphere in the presence of water steam. The invention also discloses a catalyst having a hydrogenation catalysiseffect and using the alumina formed body as a carrier, a preparation method thereof, and a hydrotreatment method. The formed body having a high strength is prepared from hydrated alumina wet gel, sothe step for drying the hydrated alumina wet gel is omitted, extra water introduced for processing dry glue powder into a formable material is avoided during the preparation of a formed raw material,the total process flow is simplified, the total operating energy consumption is reduced, dust pollution initiated by pseudo-boehmite dry glue powder used as a raw material is avoided, and the workingenvironment is improved.

Description

Technical field [0001] The present invention relates to the technical field of alumina molding. Specifically, the present invention relates to an alumina molded body and a preparation method and application thereof. The present invention also relates to a catalyst using the alumina molded body as a carrier and a preparation method thereof. Hydrotreating method using this 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 better pore structure, suitable specific surface area and higher heat resistance. Carrier use. This kind of alumina is usually obtained from dried hydrated alumina, such as pseudo-boehmite, which is formed, dried, and calcined at high temperature. [0003] Based on the above understanding, such as figure 1 As shown, the prepared hydrated alumina wet gel needs to be dried to obtain pseudo-boehmite dry rubber powder, and then ...

AI Technical Summary

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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