Alumina hydrate composition and catalyst containing zsm-22 type molecular sieve, preparation method and hydroisomerization method

Abstract

The invention discloses a hydrated alumina composition containing a ZSM-22 type molecular sieve, and a preparation method thereof, and a molding body, a preparation method and applications thereof. The hydrated alumina composition contains hydrated alumina, a ZSM-22 type molecular sieve and a compound having at least two proton acceptor sites, wherein the [phi] value is less than 5. The present invention further discloses a hydroisomerization catalyst using a molding body formed from the hydrated alumina composition as a carrier, and a preparation method thereof, and a hydroisomerization method. According to 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 stepis eliminated, the total process is simplified, the total operation energy consumption is reduced, the dust pollution caused by the application of the pseudoboehmite dry glue powder as the raw material is avoided, and the working environment is greatly improved; and the obtained catalyst has good catalytic activity in the hydroisomerization reaction.

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 containing ZSM-22 molecular sieve and its preparation method, and the present invention also relates to the hydrated alumina formed from the hydrated alumina composition. Aluminum molded body and alumina molded body, the present invention further relates to a hydroisomerization catalyst using the molded body formed from the hydrated alumina composition as a carrier, a preparation method thereof, and a hydroisomerization process using the catalyst method. Background technique [0002] ZSM-22 molecular sieve is a new type of aluminosilicate molecular sieve material developed in the 1980s by Dwyer et al. of Mobil Corporation of the United States. It belongs to the orthorhombic crystal system, the space group is Mmc21, and the unit cell parameter is a=13. ZSM-22 molecular sieve has a TON structural topolo...

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Problems solved by technology

[0015] (1) Pseudo-boehmite that has not been completely dried has strong viscosity, is difficult to transfer, and easily causes secondary dust pollution;

[0016] (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;

[0017] (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;

[0018] (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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