A hydrated alumina composition, molded body, preparation method, catalyst, and preparation method thereof

Abstract

The invention discloses a hydrated alumina composition and a preparation method thereof, a molding body, a preparation method and applications thereof, and a production molding system. The hydrated alumina composition contains hydrated alumina and a compound having at least two proton acceptor sites, wherein the [phi] value of the composition is 1.8-5. The present invention further discloses a catalyst using a molding body formed from the hydrated alumina composition as a carrier and having hydrogenation catalysis effect, and a preparation method thereof, and a hydrotreating method. Accordingto the present invention, the high-strength molding body is prepared by using the hydrated alumina wet gel as the starting raw material, such that the hydrated alumina wet gel drying step is eliminated; during the preparation of the molding raw material, the pseudoboehmite dry glue powder is blended into the moldable material without the adding of water, such that the total process is simplified,the operation energy consumption is reduced, and the dust pollution caused by the application of the pseudoboehmite dry glue powder as the raw material is avoided; and the catalyst using the molding body prepared from the hydrated alumina composition as the carrier has high catalytic activity in the hydrogenation of hydrocarbon oils.

Description

technical field [0001] The present invention relates to the technical field of alumina forming. Specifically, the present invention relates to a hydrated alumina composition and a preparation method thereof. The present invention also relates to a hydrated alumina formed body and an alumina formed body formed from the hydrated alumina. The present invention further relates to a catalyst having hydrogenation catalysis using the shaped body formed from the hydrated alumina composition as a carrier, a method for its preparation, and a method for hydrogenation 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, an...

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 and has no possibility of industrial application. sex, which is the biggest problem facing the technology

Images