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Preparation method of pseudo-boehmite and porous alumina

A pseudo-boehmite, alumina technology, applied in the preparation of alumina/hydroxide, chemical instruments and methods, alumina/aluminum hydroxide, etc., can solve the problem of low production efficiency, high energy consumption, time required It can reduce the preparation cost, simplify the drying process and reduce the dust.

Active Publication Date: 2013-02-06
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
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  • Claims
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AI Technical Summary

Problems solved by technology

[0008] In the above-mentioned prior art, the pseudo-boehmite (a specific form of aluminum hydroxide) used is a powder product, which needs a long time of drying in the preparation process, the time required for the generation process is long, and the production efficiency is low , high energy consumption

Method used

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Examples

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preparation example Construction

[0029] The preparation method of the porous alumina carrier for the hydrogenation catalyst of heavy oil adopts the pH swing gelation method. The specific process includes the following steps:

[0030] a) Prepare an acidic aluminum salt aqueous solution with Al in the solution 2 O 3 The calculated concentration is 2~10g / 100ml;

[0031] b) Prepare an alkaline aluminate aqueous solution with Al in the solution 2 O 3 The concentration of the meter is 8~30g / 100ml, or prepare dilute ammonia solution, NH 3 The content is 8~16 g / 100ml;

[0032] c) Add an appropriate amount of acidic aluminum salt aqueous solution to the neutralized bottom water to reduce the pH to 2.0-4.0, preferably 3.0-4.0, most preferably 3.0-3.5, and the temperature of the solution is 50-95°C, preferably 55 ~75℃, the most suitable is 60~70℃; stop adding the acidic aluminum salt aqueous solution and stabilize for 3~10 minutes;

[0033] d) The acidic aluminum salt aqueous solution and the alkaline aluminate aqueous solution...

Embodiment 1

[0045] Add 2L sodium metaaluminate aqueous solution (with Al 2 O 3 The calculated concentration is 15g / 100mL) and 3L aqueous solution of aluminum sulfate (in Al 2 O 3 The concentration of the meter is 3g / 100mL) respectively into the container at the high position, and the flow meter connected to the bottom flows into the stainless steel container equipped with 6L water purification with agitator and heating jacket, and heat to 60℃; under agitation, pass in The aluminum sulfate solution reduces the pH value of the slurry to 3.0. After 10 minutes of stability, the two materials are added into the stainless steel tank at a certain speed at the same time, and the pH value is maintained at 7.3, and the gelation reaction is neutralized for 15 minutes. Then stop adding aluminum sulfate solution to increase the pH to 9.2, stop adding sodium metaaluminate solution, and stabilize for a period of time; pass in aluminum sulfate solution to lower the pH value of the slurry to 3.0, and stabili...

Embodiment 2

[0047] Compared with Example 1, the solution temperature during the pH swing process was 65° C., the neutralization pH value was 7.0, and the amount of other materials and operating conditions were the same as those of Example 1, and sample 2 was obtained.

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Abstract

The invention provides a preparation method of pseudo-boehmite and porous alumina. The weight content of pseudo-boehmite is 30%-50% that of alumina. The preparation method of pseudo-boehmite comprises the steps of (1) performing neutralized gelatinizing reaction on an aluminium salt solution and a precipitating agent; (2) filtering and recovering solid products of the gelatinizing reaction; (3) drying the solid product obtained by filtering, wherein the dried material is pseudo-boehmite with the weight content being 30-50% that of alumina; and shaping, drying and roasting the obtained pseudo-boehmite to obtain porous alumina. The method simplifies the drying process in the preparation process of pseudo-boehmite, increases production efficiency, reduces production energy consumption, and further reduces the cost of catalysts. The porous alumina prepared by the method can be used as carriers for various hydrogenation catalysts.

Description

Technical field [0001] The invention relates to a method for preparing pseudo-boehmite and porous alumina, in particular to a method for preparing pseudo-boehmite and porous activated alumina used as a hydrogenation catalyst carrier. Background technique [0002] Porous activated alumina is the most commonly used carrier component in the field of catalysts and is used in a variety of catalytic fields, such as hydrogenation catalysts, automobile exhaust catalysts, sewage treatment catalysts and other fields. Especially in the field of hydrogenation is the most widely used. [0003] As the world's crude oil has gradually become heavier and worse, and the market demand for light oil products, especially high-quality clean light oil products, has grown rapidly, hydrogenation technology has received special attention worldwide. For example, the hydrorefining of various light distillates and the hydrotreating of heavy oils. [0004] Heavy oil is the most complex part of crude oil, which ...

Claims

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Application Information

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IPC IPC(8): C01F7/02C01F7/30B01J21/04B01J32/00
Inventor 刘文杰王刚隋宝宽安晟吴国林刘杰
Owner CHINA PETROLEUM & CHEM CORP
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