Production method of pseudo-boehmite with large pore volume

A pseudo-boehmite and production method technology, which is applied to the preparation of alumina/aluminum hydroxide, alkali metal aluminate/alumina/aluminum hydroxide, etc., can solve the problems of large fluctuations in product quality, long reaction time, and production problems. In order to achieve the effect of inhibiting spontaneous hydrolysis reaction, realizing continuous production and promoting neutralization reaction

Active Publication Date: 2017-05-24
CHINA PETROLEUM & CHEM CORP +2
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  • Description
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Problems solved by technology

The above method adopts the direct introduction of CO into the reaction device 2 It is decomposed into glue, so there are the following disadvantages: the process equipment is backward, the automation level is low, and the labor efficiency is low; the traditional decomposition tank is harmful to CO 2 Low absorption rate, small production capacity; long reaction time, large fluctuations in product quality; easy scarring of production equipment, short operating cycle; difficult to achieve continuous production

Method used

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  • Production method of pseudo-boehmite with large pore volume
  • Production method of pseudo-boehmite with large pore volume
  • Production method of pseudo-boehmite with large pore volume

Examples

Experimental program
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Effect test

Embodiment 1

[0069] See Table 1 for other process conditions of Examples 1-5, and see Table 2 for the performance parameters of the obtained pseudo-boehmite. The XRD pattern of the pseudo-boehmite prepared in Example 1 is shown in figure 2 .

[0070] Table 1

[0071]

[0072]

[0073] Table 2

[0074] Performance parameters Example 1 Example 2 Example 3 Example 4 Example 5 Pore ​​volume V(ml / g) 0.65 0.85 0.72 1.01 0.92 Specific surface area (m 2 / g)

375.53 365.01 347.56 298.33 310.25

[0075] The performance parameters of the pseudo-boehmite obtained in Examples 1-5 have little change, which shows that the method of the present invention can obtain pseudo-boehmite products with stable quality.

[0076] In addition, Examples 1-5 were repeated 5 times respectively, and the variation range of the performance parameters of the obtained pseudo-boehmite was less than 0.5%, which indicated that the method of the present invention had good ...

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Abstract

The invention discloses a production method of large pore volume pseudo boehmite. The production method comprises the following steps: the step of gel-forming, the step of aging, the step of separation and washing and the step of drying. During the gel-forming step, a meta-aluminate solution containing a pore-enlarging agent and carbon dioxide gas are contacted with each other in an inorganic membrane reactor so as to form a reaction product. By the method of the invention, pseudo boehmite of stable quality can be produced.

Description

technical field [0001] The invention relates to a method for producing pseudo-boehmite, in particular to a method for producing pseudo-boehmite with a large pore volume by carbonization. Background technique [0002] Alumina powder is often used as a desiccant, adsorbent, catalyst and catalyst carrier in the chemical industry. However, natural or artificially produced alumina monohydrate and alumina trihydrate have low specific surface area, small pore volume, and low activity, so they cannot be used as desiccants, adsorbents, catalysts, and catalyst supports. Pseudo-boehmite has the characteristics of high specific surface area, large pore volume, large pore diameter, and high activity. It is suitable for use as desiccant, adsorbent, and catalyst and catalyst carrier in the fields of petrochemical, fertilizer, and tail gas. Therefore, there is a need to convert alumina monohydrate or alumina trihydrate to pseudoboehmite. [0003] Pseudo-boehmite has low crystallinity, hig...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01F7/02C01F7/14
Inventor 史建公文建军刘志坚张敏宏张文平罗道威史建新蒋绍洋张新军伊红亮钟健李卫红
Owner CHINA PETROLEUM & CHEM CORP
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