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Aluminum oxide specially used for hydrogen peroxide fluidized bed and production technology for aluminum oxide

A water-fluidized bed, production process technology, applied in physical/chemical process catalysts, inorganic chemistry, aluminum compounds, etc., to achieve the effects of increasing pore volume, increasing specific surface area, and prolonging service life

Active Publication Date: 2014-05-28
石家庄恒诺科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

It can be seen that the role of activated alumina in the production process of hydrogen peroxide is not small. In addition to absorbing the lye, water, and decomposed residual hydrogen peroxide carried by the working fluid, it has a strong regeneration of hydrogenated degradation products, which can reduce the hydrogenation reaction. The conversion of degradation products into effective anthraquinones ensures the stability of the total effective anthraquinones, facilitates the oxidation reaction, reduces the amount of anthraquinones added, and saves operating costs. However, if activated alumina is used improperly, it will shorten Its service life may even jeopardize the safe operation of the entire production system

Method used

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  • Aluminum oxide specially used for hydrogen peroxide fluidized bed and production technology for aluminum oxide

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Effect test

Embodiment 1

[0043] The production process of activated alumina by rapid dehydration method is as follows: the raw material aluminum hydroxide containing 6-14% free water is dried at 120°C by airflow dryer, and then crushed into α-gibbsite with a fineness of 325 mesh in the crushing process. Contact with hot gas at 600-900 ℃ in the high-temperature rapid dehydration device, stay in the highly turbulent hot air for 0.1-1s, a set of systems forms χ-Al 2 o 3 , ρ-Al 2 o 3 The transitional alumina mainly enters the cyclone separator for solid-gas separation, and the hot gas is further captured by a cloth bag and then emptied; a system forms a transitional state alumina mainly composed of pseudo-boehmite, which is also separated by a first-stage cyclone and utilized The waste heat gas preheats the pulverized material, collects the material through the secondary cyclone separator and cloth bag, and enters (returns) the rapid dehydration system. While creating an atmosphere that meets the requir...

Embodiment 2

[0057] The production process of special alumina for hydrogen peroxide fluidized bed, the process comprises the following steps:

[0058] (1) Drying: The raw material aluminum hydroxide containing 10% free water is dried at 120°C by an airflow dryer, and 25% boehmite is added in this step;

[0059] (2) Pulverization: pulverize the dried material in step (1) to 325 mesh;

[0060] (3) Quick dehydration: In the high-temperature rapid dehydration device, the pulverized material in step (2) is contacted with 800 ℃ hot gas;

[0061] Stay in the highly turbulent hot gas flow for 0.5s to form χ-Al 2 o 3 , ρ-Al 2 o 3 The main transitional alumina enters the cyclone separator for solid-gas separation. After the separation, it will be de-powdered quickly, and the fast-powdered powder will be reduced to 8.3%. The hot gas will be further captured by the cloth bag and then emptied;

[0062] (4) Balling: add deionized water to the separated fine powder and make balls of required size in...

Embodiment 3

[0068] The production process of special alumina for hydrogen peroxide fluidized bed, the process comprises the following steps:

[0069] (1) Drying: The raw material aluminum hydroxide containing 6% free water is dried at 120°C by an airflow dryer, and 20% boehmite is added in this step;

[0070] (2) Pulverization: pulverize the dried material in step (1) to 325 mesh;

[0071] (3) Quick dehydration: In the high-temperature rapid dehydration device, the crushed material in step (2) is contacted with hot gas at 600-900 °C;

[0072] Stay in the highly turbulent hot air for 0.1~1s to form χ-Al 2 o 3 , ρ-Al 2 o3 The main transitional alumina enters the cyclone separator for solid-gas separation. After the separation, it will be de-powdered quickly, and the fast-powdered powder will be reduced to 8.3%. The hot gas will be further captured by the cloth bag and then emptied;

[0073] (4) Balling: add deionized water to the separated fine powder and make balls of required size in ...

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Abstract

The invention belongs to the field of chemical engineering and in particular relates to aluminum oxide specially used for a hydrogen peroxide fluidized bed and a production technology for the aluminum oxide specially used for the hydrogen peroxide fluidized bed. The aluminum oxide specially used for the hydrogen peroxide fluidized bed is characterized in that the bulk density of the aluminum oxide is 0.68-0.75 g / cm<3>, and the intensity is higher than 80; the specific surface area is larger than 320 m<2> / g; the pore volume is bigger than 0.4 cm<3> / g, and the water absorption rate is higher than 60 percent. The method comprises the following steps of (1) drying; (2) smashing; (3) quick removal; (4) balling; (5) nourishing; (6) activation; (7) crushing and cooling; (8) screening and packaging. The aluminum oxide and the production technology have the benefits of improvement on the regeneration of working liquid in a hydrogen peroxide production process and prolonged service cycle.

Description

technical field [0001] The invention belongs to the field of chemical industry, and in particular relates to a special alumina for a hydrogen peroxide fluidized bed, and also relates to a production process of the special alumina for a hydrogen peroxide fluidized bed. Background technique [0002] Heating aluminum hydroxide to dehydrate by conventional method produces about 20% boehmite, the specific surface area of ​​the product is low, and a part of χ-Al is formed. 2 o 3 . Activated alumina for hydrogen peroxide is a white spherical substance with high strength, insoluble in water and organic solvents such as hydrocarbons, alcohols, fats, etc., does not pulverize and soften in water and alkali, has high clarity, and has a long service life. Odorless, tasteless, non-toxic, and strong in degradation and regeneration of anthraquinone derivatives, it is a special adsorbent for the production of hydrogen peroxide by anthraquinone method. Activated alumina is porous, highly ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01F7/44B01J20/08B01J21/04
Inventor 杜云峰杨玉龙谢壮志商冲
Owner 石家庄恒诺科技有限公司
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