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: 2014-07-23
CHINA PETROLEUM & CHEM CORP +1
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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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Effect test

preparation example Construction

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

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

[0031] b) Prepare an aqueous alkaline aluminate solution in which Al 2 o 3 The calculated concentration 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 solution to the neutralized bottom water to lower the pH value to 2.0-4.0, preferably 3.0-4.0, most preferably 3.0-3.5, and the solution temperature is 50-95°C, preferably 55 ~75°C, the most suitable is 60~70°C; stop adding the acidic aluminum salt solution, and stabilize for 3~10 minutes;

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

Embodiment 1

[0045] 2L sodium metaaluminate aqueous solution (with Al 2 o 3 The concentration is 15g / 100mL) and 3L aluminum sulfate aqueous solution (as Al 2 o 3 The concentration of the meter is 3g / 100mL) and put them into the container at the high position respectively, and the flow meter flows into the stainless steel container equipped with a 6L clean water belt agitator and a heating mantle, and heats to 60°C; Aluminum sulfate solution, reduce the pH value of the slurry to 3.0, and after stabilizing for 10 minutes, add the two materials into the stainless steel tank at a certain speed at the same time, keep the pH value at 7.3, and neutralize the gelling reaction for 15 minutes. Then stop adding aluminum sulfate solution, so that the pH value rises to 9.2, stop adding sodium metaaluminate solution, and stabilize for a period of time; pass through aluminum sulfate solution, reduce the pH value of the slurry to 3.0, and stabilize for a period of time; pass through sodium metaaluminate...

Embodiment 2

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

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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 various 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 gradually becomes heavier and worse, and the market demand for light oil products, especially high-quality clean light oil products, grows rapidly, hydrogenation technology has received special attention worldwide. For example, hydrorefining of various light distillate oils, hydrotreating of heavy oils, etc. [0004] Heavy oil is the most complex part of crude oil, which cont...

Claims

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Application Information

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Patent Type & Authority Patents(China)
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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