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Preparation method of superfine high-purity gamma-aluminum oxide

An alumina, fine and high technology, which is applied in the field of preparation of ultra-fine and high-purity γ-alumina, can solve the problems of low production efficiency and low product purity, and achieve the effects of convenient operation, high material purity and high reaction product purity.

Active Publication Date: 2021-06-11
浙江爱科新材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The main purpose of the present invention is to provide a preparation method of ultra-fine high-purity γ-alumina to solve the problem of the production efficiency of the existing γ-type alumina preparation method Low, the product purity is not high

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  • Preparation method of superfine high-purity gamma-aluminum oxide
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Effect test

Embodiment 1

[0026] Such as figure 1 and figure 2 As shown, the preparation method of the ultrafine high-purity gamma-alumina of the present embodiment comprises the following steps:

[0027] First, inject 10kg of aluminum particles into the micro-mixing reaction zone of the channel reactor through the metal aluminum inlet of the channel reactor, the average particle size is 5mm, and the aspect ratio of the channel reactor is 20:1, and then pass through the channel reaction Put 40g of catalyst aluminum isopropoxide into the metal aluminum inlet of the reactor; then heat to 50°C, pump isopropanol through the isopropanol inlet of the channel reactor at a rate of 1L per hour, and heat up to 85°C after 5 minutes of reaction The continuous reflux reaction is carried out in the micro-mixing reaction zone in the channel reactor, and the qualified aluminum isopropoxide and isopropanol mixed liquid appears at the outlet of the reaction product of the channel reactor after 60 minutes of feeding. ...

Embodiment 2

[0033] The preparation method of ultrafine high-purity gamma-alumina of the present embodiment, it comprises the following steps:

[0034] First, inject 10kg of aluminum particles into the micro-mixing reaction zone of the channel reactor through the metal aluminum inlet of the channel reactor, with an average particle size of 5mm, and the aspect ratio of the channel reactor is 25:1, and then pass through the channel reaction Add 40g of catalyst (aluminum isopropoxide or tri-n-propylaluminum) to the metal aluminum inlet of the reactor; then heat to 50°C and pump isopropanol through the isopropanol inlet of the channel reactor at a rate of 1 L per hour After reacting for 5 minutes, the temperature was raised to 85°C for continuous reflux reaction in the micro-mixed reaction zone in the channel reactor, and after 72 minutes of passing through the reaction product outlet of the channel reactor, a mixed liquid of qualified aluminum isopropoxide and isopropanol appeared. The temper...

Embodiment 3

[0040] The preparation method of ultrafine high-purity gamma-alumina of the present embodiment, it comprises the following steps:

[0041] First, inject 10kg of aluminum particles into the micro-mixing reaction zone of the channel reactor through the metal aluminum inlet of the channel reactor, the average particle size is 5mm, and the aspect ratio of the channel reactor is 30:1, and then pass through the channel reaction Add 40g of catalyst (aluminum isopropoxide or tri-n-propylaluminum) to the metal aluminum inlet of the reactor; then heat to 50°C and pump isopropanol through the isopropanol inlet of the channel reactor at a rate of 1 L per hour After reacting for 5 minutes, the temperature was raised to 85°C for continuous reflux reaction in the micro-mixing reaction zone in the channel reactor, and after 88 minutes, a qualified aluminum isopropoxide and isopropanol mixed liquid appeared at the outlet of the reaction product of the channel reactor. The temperature of the ch...

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Abstract

The invention discloses a preparation method of superfine high-purity gamma-aluminum oxide, which comprises the following steps: S1, loading metallic aluminum and a catalyst into a channel reactor, continuously introducing isopropanol at a constant speed at one end of the channel reactor, carrying out continuous synthetic reaction to obtain aluminum isopropoxide, and carrying out rectification operation to obtain high-purity aluminum isopropoxide; S2, dissolving high-purity aluminum isopropoxide in isopropanol, then dropwise adding a formed solution into deionized water diluted by isopropanol, conducting hydrolyzing and aging to obtain a precipitate, and conducting drying to obtain an aluminum oxide precursor; and S3, after sieving, performing high-speed ball milling by taking absolute ethyl alcohol as a dispersing agent, conducting drying, regrinding and sieving, and finally performing dehydration reaction to obtain a gamma-aluminum oxide product. According to the preparation method of the superfine high-purity gamma-aluminum oxide, on one hand, the prepared gamma-aluminum oxide is high in purity, on the other hand, continuous production of high-purity aluminum isopropoxide can be achieved, the process is simple, operation is convenient, and the requirement for preparing the gamma-aluminum oxide in batches is met.

Description

technical field [0001] The invention relates to the technical field of gamma-alumina preparation, in particular to a preparation method of ultrafine high-purity gamma-alumina. Background technique [0002] Alumina is an inorganic substance with the chemical formula Al 2 o 3 . It is a high hardness compound with a melting point of 2054°C and a boiling point of 2980°C. Al 2 o 3 There are many homogeneous crystals, more than 10 kinds are known, and there are mainly three crystal forms, namely α-Al 2 o 3 , β-Al 2 o 3 , γ-Al 2 o 3 . Among them, the structure is different and the properties are also different. γ-type alumina is a porous substance with an internal surface area of ​​up to hundreds of square meters per gram, high activity and strong adsorption capacity. Industrial products are usually colorless or slightly pink cylindrical particles with good pressure resistance. It is a commonly used adsorbent, catalyst and catalyst carrier in petroleum refining and pe...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01F7/36
CPCC01F7/30C01P2006/80
Inventor 张志峰周海东余瑶辰
Owner 浙江爱科新材料有限公司
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