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

A technology of hydrated alumina and alkaline earth metals, applied in the direction of metal/metal oxide/metal hydroxide catalysts, chemical instruments and methods, physical/chemical process catalysts, etc., can solve secondary dust pollution, transfer difficulties, and difficult Stably control the dry basis of pseudo-boehmite and other issues to achieve the effect of reducing operating energy consumption and simplifying the process

Active Publication Date: 2018-05-08
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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

Method used

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

Examples

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preparation example Construction

[0123] According to the preparation method of the hydrated alumina composition of the present invention, in a more preferred embodiment, the compound having at least two proton acceptor sites contains galactomannan and cellulose ether. The shaped bodies formed from the composition according to this more preferred embodiment have higher strength. Further preferably, the compound having at least two proton acceptor sites is preferably galactomannan and cellulose ether.

[0124] In this more preferred embodiment, based on the total amount of the compound having at least two proton acceptor sites, the content of the galactomannan may be 10-70% by weight, preferably 15% by weight. -68% by weight, more preferably 20-65% by weight; the content of the cellulose ether may be 30-90% by weight, preferably 32-85% by weight, more preferably 35-80% by weight.

[0125] The content of the alkaline earth metal-containing compound in the raw material mixture can be selected according to the co...

Embodiment 1

[0271] The hydrated alumina wet gel used in this example is to add magnesium nitrate to the hydrated alumina gel solution prepared by the acid method (sodium metaaluminate-aluminum sulfate method, obtained from Sinopec Changling Branch) during the aging process , the magnesium-containing pseudo-boehmite wet filter cake (this wet filter cake is numbered as SLB-1) obtained after washing with a belt filter, after determination, the i value of this wet filter cake is 78%, expressed as MgO The calculated magnesium content is 6% by weight.

[0272] (1) Put 240g of wet filter cake numbered SLB-1 in a beaker, then add 6g of methyl cellulose (purchased from Zhejiang Haishen Chemical Co. The sugar content is 80% by weight, purchased from Beijing Chemical Reagent Company, the same below), and after being stirred by a mechanical stirrer for 10 minutes, the obtained mixture is the magnesium-containing alumina hydrate composition of the present invention, and its property parameters are lis...

Embodiment 2

[0276] Adopt the same method as Example 1 to prepare the alumina molded body, the difference is that in step (3), during the constant temperature period, the air flow output from the outlet of the tube furnace is not circulated into the tube furnace, but at the constant temperature During this period, air was supplied from the inlet of the tube furnace to the inner space of the tube furnace at 10 L / min. The property parameters of the prepared alumina supports are listed in Table 2.

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Abstract

The invention discloses an alkaline earth metal-containing hydrated alumina composition and molded body, a preparation method and application thereof, a catalyst and a preparation method thereof. Thecomposition contains hydrated alumina, a compound containing at least two proton acceptor sites and an alkaline earth metal-containing compound. The composition has the phi value of 5 or less shown inthe description. The invention also discloses a catalyst using the molded body of the alkaline earth metal-containing hydrated alumina composition as a carrier and having hydrogenation catalysis effects, a preparation method thereof and a hydrogenation treatment method. The high strength molded body is prepared from hydrated alumina wet gel as a starting raw material so that the hydrated aluminawet gel drying process is avoided. In molded raw material preparation, water for preparation of the molded material from pseudo-boehmite dry glue powder is avoided so that the overall processes are reduced, overall operation energy consumption is reduced, the dust pollution caused by the use of pseudo-boehmite dry glue powder as a raw material is avoided and the working environment is greatly improved.

Description

technical field [0001] The present invention relates to the technical field of alumina molding. Specifically, the present invention relates to a composition of alkaline earth metal-containing hydrated alumina and a preparation method thereof. Aluminum molded body and alumina molded body, the present invention further relates to a catalyst having hydrogenation catalysis using the molded body formed from the alkaline earth metal-containing hydrated alumina composition as a carrier, a preparation method thereof and a method 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 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 calci...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J32/00B01J21/10B01J23/882B01J23/883B01J23/887
CPCB01J21/10B01J23/002B01J23/882B01J23/883B01J23/8872B01J2523/00B01J35/67B01J35/69B01J35/615B01J2523/847B01J2523/68B01J2523/22B01J2523/31B01J2523/845
Inventor 胡大为杨清河聂红刘滨曾双亲孙淑玲邓中活
Owner CHINA PETROLEUM & CHEM CORP
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