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Preparation method of pseudo-boehmite

A technology of pseudo-boehmite and meta-aluminate is applied in the field of producing pseudo-boehmite by carbonization, which can solve the problems of large fluctuation of product quality, easy scarring of production equipment, small production capacity, etc., and achieves inhibition of spontaneous hydrolysis. reaction, beneficial to industrial application, and the effect of promoting neutralization reaction

Active Publication Date: 2017-05-24
CHINA PETROLEUM & CHEM CORP +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0015] 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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  • Preparation method of pseudo-boehmite

Examples

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preparation example Construction

[0041] The preparation method of the pseudo-boehmite of the present invention includes a gelation step. Optionally, the preparation method of the pseudo-boehmite of the present invention may further include an aging step, a separation washing step and a drying step.

[0042]

[0043] The gel forming step of the present invention is to contact the metaaluminate solution with carbon dioxide gas in an inorganic membrane reactor to form a reaction product.

[0044] In the present invention, the inorganic membrane reactor may be selected from tubular inorganic membrane reactors or hollow fiber inorganic membrane reactors. The tubular type and the hollow fiber type mentioned here both refer to the shape of the inorganic membrane. Preferably, the inorganic membrane reactor of the present invention is a tubular inorganic membrane reactor or a hollow fiber inorganic membrane reactor.

[0045] In the present invention, the inorganic membrane reactor includes a casing and an inorgani...

Embodiment 1

[0067] 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 .

[0068] Table 1

[0069]

[0070] Table 2

[0071] performance parameter Example 1 Example 2 Example 3 Example 4 Example 5 Pore ​​volume V(ml / g) 0.35 0.40 0.41 0.42 0.45 Specific surface area (m 2 / g)

440.50.33 387.80 347.56 303.33 280.87

[0072] 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.

[0073] 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 3%, which indicated that the method of the present invention had good repeatabilit...

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Abstract

The invention discloses a preparation method of pseudo-boehmite. The preparation 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 step of gel-forming, a meta-aluminate solution and carbon dioxide gas are contacted with each other in an inorganic membrane reactor so as to form a reaction product, wherein pressure of the carbon dioxide gas is greater than or equal to 0.1 MPa. 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 preparing pseudo-boehmite, in particular to a method for producing pseudo-boehmite 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, higher water content than bo...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01F7/14
Inventor 史建公张敏宏刘志坚张文平文建军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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