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Preparation methods of fibroid boehmite and activated aluminum oxide

A pseudo-boehmite and activated alumina technology, which is applied in the preparation of alkali metal aluminate/alumina/aluminum hydroxide, alumina/aluminum hydroxide, etc., can solve problems such as easy blockage and device blockage, and achieve The effects of large pore volume, uniform properties, and high specific surface area

Inactive Publication Date: 2011-05-11
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The main feature of this method is the use of a carbonization reactor, which is a rotating packed bed RPB. The reactant system reacts in the rotating packed bed RPB to form ultrafine particles, causing the device to be blocked quickly.
Therefore, the RPB device still has the defect that it is easy to clog for the system with ultrafine particles.

Method used

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  • Preparation methods of fibroid boehmite and activated aluminum oxide
  • Preparation methods of fibroid boehmite and activated aluminum oxide
  • Preparation methods of fibroid boehmite and activated aluminum oxide

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0041] This example is used to illustrate the preparation of fibrous pseudo-boehmite and activated alumina provided by the present invention.

[0042] in such as figure 1 In the spiral channel type rotating bed high gravity reactor shown, the aqueous solution of metaaluminate is contacted with the gas containing carbon dioxide to react, and the diameter of the rotor is Φ300 mm.

[0043] The sodium metaaluminate solution of 0.4mol / L is placed in the circulation tank 13, and the sodium metaaluminate solution passes through the water pump 12, the valve 11, and the fluid flow meter 10 from the liquid inlet 8 of the spiral channel type rotating bed RBHC reactor 4, Through the distributor 15, it enters the spiral channel of the rotor 5; it will contain CO 2 air (CO 2 The volume concentration is ≥ 99%) after decompression from the gas source of the steel cylinder, through the gas valve 1, the gas flow meter 2, from the air inlet 3 and the air inlet 9 from the outside of the spiral ...

Embodiment 2

[0045] This example is used to illustrate the preparation of fibrous pseudo-boehmite and activated alumina provided by the present invention.

[0046] Activated alumina is prepared according to the method of Example 1, the difference is that the concentration of sodium metaaluminate solution is 0.2 mol / liter, CO 2 The volume concentration is ≥90%, the rotating speed of the rotor 5 is 1000rpm, and the hydrothermal treatment time is 4 hours. The properties of the obtained pseudo-boehmite product (average pore diameter 23.8 nanometers) are shown in Table 1.

Embodiment 3

[0048] This example is used to illustrate the preparation of fibrous pseudo-boehmite and activated alumina provided by the present invention.

[0049] Activated alumina is prepared according to the method of Example 1, the difference is that the concentration of sodium metaaluminate solution is 0.5 mol / liter, CO 2 The volume concentration is ≥95%, the gas-liquid volume flow ratio is controlled to be 4, and the hydrothermal treatment time is 4 hours. The properties of the obtained pseudo-boehmite product (average pore diameter 24.8 nanometers) are shown in Table 1.

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Abstract

The invention relates to a preparation method of fibroid boehmite, comprising the following steps of: (1) enabling an aluminate water solution and gases containing carbon dioxide to contact and react under the supergravity condition, and carrying out solid-liquid separation to obtain a solid product; (2) carrying out hydro-thermal treatment on the solid product obtained in the step (1), and then carrying out solid-liquid separation again to obtain a solid product; (3) mixing the solid product obtained in the step (2) and a first organic solvent to form a suspension; and (4) filtering and drying the suspension obtained in the step (3). The invention also provides a method for preparing the activated aluminum oxide by the boehmite. By adopting the method provided by the invention, the fibroid boehmite and the activated aluminum oxide with larger pore volume, higher specific surface area and high purity can be obtained and have more uniform and stable properties.

Description

technical field [0001] The invention relates to a preparation method of fibrous pseudo-boehmite and activated alumina. Background technique [0002] Activated alumina generally refers to γ-Al 2 o 3 , Activated alumina has a relatively high specific surface area, adsorption performance, surface chemical properties, certain porosity and pore size distribution, and is often used as a catalyst and carrier in oil refining, petrochemical and fertilizer industries. Moreover, the purer and finer the particles, the wider the use and the higher the price. Ultrafine activated alumina often has much higher activity than ordinary alumina. γ-Al 2 o 3 It is usually prepared by dehydrating pseudo-boehmite at high temperature. [0003] At present, domestically, industrial aluminum hydroxide is mainly prepared by acid-dissolving and re-precipitating with ammonia water or other alkalis, and activated alumina is obtained after roasting. This method has complex production process, requires...

Claims

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Application Information

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IPC IPC(8): C01F7/02C01F7/14
Inventor 周继承韦国有李友凤于向真李闯谢庚华彭卫国廖立民谢放华
Owner CHINA PETROLEUM & CHEM CORP