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Alumina molded body, preparation method and application thereof, catalyst, preparation method, hydrotreating method and production molding system

A technology of molded body and alumina, which is applied in the direction of metal/metal oxide/metal hydroxide catalyst, physical/chemical process catalyst, catalyst carrier, etc., can solve the problems of secondary dust pollution, difficult transfer, high water content, etc. Achieve the effects of reducing operating energy consumption, avoiding dust pollution, and simplifying the process flow

Active Publication Date: 2020-06-16
CHINA PETROLEUM & CHEM CORP +1
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  • 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, which is not suitable for industrial applications. possibility, which is the biggest problem facing the technology

Method used

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  • Alumina molded body, preparation method and application thereof, catalyst, preparation method, hydrotreating method and production molding system
  • Alumina molded body, preparation method and application thereof, catalyst, preparation method, hydrotreating method and production molding system
  • Alumina molded body, preparation method and application thereof, catalyst, preparation method, hydrotreating method and production molding system

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preparation example Construction

[0049] According to the first aspect of the present invention, the present invention provides a method for preparing an alumina molded body, the method comprising the following steps: (1) molding a hydrated alumina composition to obtain a molded body;

[0050] Optionally, (2) drying the molded product obtained in step (1) to obtain a dried molded product;

[0051] (3) In the presence of water vapor, calcining the molded product obtained in step (1) or the dried molded product obtained in step (2) in an oxygen-containing atmosphere.

[0052] In step (1), the hydrated alumina composition contains hydrated alumina and a compound having at least two proton acceptor sites.

[0053] The alumina hydrate may be one or more selected from alumina trihydrate and alumina monohydrate. The hydrated alumina preferably contains alumina monohydrate, more preferably alumina monohydrate. Specific examples of the hydrated alumina may include, but are not limited to, boehmite, alumina trihydrate...

Embodiment 1

[0175] The alumina hydrate wet gel used in this example is a quasi-alumina hydrogel solution prepared by the acid method (sodium metaaluminate-aluminum sulfate method, obtained from Sinopec Changling Branch) after washing and filtering. The wet filter cake of boehmite (the wet filter cake is coded as SLB-1), after measurement, the i value of the wet filter cake is 78.2%.

[0176] (1) Put 200g of wet filter cake numbered SLB-1 in a beaker, then add 5g of methylcellulose (purchased from Zhejiang Haishen Chemical Co., Ltd., the same below) and 3g of scallop powder (galactomannan The content is 80% by weight, purchased from Beijing Chemical Reagent Company, the same below), and after stirring for 10 minutes with a mechanical stirrer, the obtained mixture is the hydrated alumina composition of the present invention (such as image 3 shown), and its properties are listed in Table 1.

[0177] (2) Extrude the hydrated alumina composition prepared in step (1) on a F-26 twin-screw extr...

Embodiment 2

[0182] (1) Mix 5 kg of wet filter cake numbered SLB-1 with 500 g of deionized water for beating for 1 minute, then send the obtained slurry into a plate and frame filter press, adjust the pressure of the plate and frame to 0.7 MPa and maintain After 15 minutes, a wet filter cake (coded as LB-1) was obtained. It has been determined that the i value of the wet filter cake numbered LB-1 is 62%.

[0183] (2) 300g of wet filter cake numbered LB-1 was placed in a beaker, and 4.5g of hydroxyethyl methylcellulose (purchased from Shanghai Huiguang Fine Chemical Co., Ltd., the same below) and 1.5g of scallop powder ( The content of galactomannan is 85% by weight (purchased from Beijing Chemical Reagent Company). After stirring for 10 minutes with a mechanical stirrer, the hydrated alumina composition of the present invention is obtained, and its properties are listed in Table 1.

[0184] (3) Extrude the hydrated alumina composition prepared in step (2) on an F-26 twin-screw extruder wi...

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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 hydrated alumina composition having a phi value being 5 or less and containing hydrated alumina and a compound having at least two proton acceptor sites, 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 catalysis effect 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, so the step for drying the hydrated alumina wet gel is omitted, the total process flow is simplified, the total operating energy consumption is reduced, dust pollution is avoided, and the working environment is improved. The catalyst prepared by adopting the alumina formed body as a carrier has an improved catalysis activity in hydrocarbon oil hydrotreatment.

Description

technical field [0001] The present invention relates to the technical field of alumina forming, specifically, the present invention relates to an alumina forming body and its preparation method and application, and the present invention also relates to a production molding system for producing the alumina forming body, the present invention It further relates to a catalyst using the alumina shaped body as a carrier, a preparation method thereof, and a hydroprocessing method 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, and then calcined at high temperature. [0003] Based on the above understanding, if ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J23/882B01J23/883B01J20/08B01J20/28B01J20/30B01J32/00C10G45/08
CPCB01J20/08B01J20/28047B01J23/882B01J23/883C10G45/08C10G2300/202C10G2300/205C10G2300/70
Inventor 杨清河胡大为聂红刘滨曾双亲孙淑玲邓中活
Owner CHINA PETROLEUM & CHEM CORP
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