Preparation method of pseudoboehmite

A technology of pseudo-boehmite and aluminum nitrate, applied in the direction of alumina/hydroxide, etc., can solve the problems of high cost and large specific surface area, and achieve the effects of simple operation, reduced process flow and low cost

Active Publication Date: 2013-10-02
甘肃莱安能源有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

3. Alcohol aluminum method, developed by German Condea company, using high-purity aluminum chips and higher alcohols as raw materials, through aluminum hydroxide-aluminum oxide-aluminum-aluminum alcohol-aluminum hydroxide cycle process, the product has good crystal form, high purity, and Larger surface area, but higher cost

Method used

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Examples

Experimental program
Comparison scheme
Effect test

example 1

[0022] Preparation of ethanol aqueous solution, ethanol: water = 1: 1 (volume ratio), in the 40 g / liter aluminum nitrate solution (prepared with alcohol aqueous solution), dropwise add ammonia water solution with a mass fraction of ammonia water of 2.2% (prepared with alcohol aqueous solution), adjust pH to 8, react at 30°C for 30 min, age at 70°C for 6 h, filter, wash with alcohol aqueous solution 2-6 times, and keep warm at 120°C for 6-24 h. The obtained pseudo-boehmite has a specific surface area of ​​383.5 m 2 / g, pore volume 0.97 cm 3 / g, pore size 9.4 nm.

example 2

[0024] Preparation of ethanol aqueous solution, ethanol: water = 9: 1 (volume ratio), in the 40 g / liter aluminum nitrate solution (prepared with alcohol aqueous solution), dropwise add ammonia water with a mass fraction of 2.2% ammonia solution (prepared with alcohol aqueous solution), adjust pH to 7, react at 50°C for 10 min, age at 80°C for 8 h, filter, wash with alcohol aqueous solution 2-6 times, and keep warm at 120°C for 6-24 h. The obtained pseudo-boehmite has a specific surface area of ​​440.8 m 2 / g, pore volume 1.23 cm 3 / g, pore size 9.6 nm.

example 3

[0026] Preparation of n-propanol aqueous solution, n-propanol: water = 4: 1 (volume ratio), in 40 g / liter of aluminum nitrate solution (prepared with alcohol aqueous solution), add dropwise ammonia water with a mass fraction of 2.2% ammonia solution (with alcohol aqueous solution prepared), adjust the pH to 10, react at 20°C for 50 min, age at 30°C for 1 h, filter, wash with alcohol aqueous solution for 2-6 times, and keep warm at 120°C for 6-24 h. The obtained pseudo-boehmite has a specific surface area of ​​432.2 m 2 / g, pore volume 1.37 cm 3 / g, pore size 11.5 nm.

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Abstract

The invention discloses a preparation method of pseudoboehmite, which comprises the steps that an alcohol water solution is prepared for standby; an aluminum nitrate solution and an ammonia water solution are prepared by taking the prepared alcohol aqueous solution as a solvent, and taking aluminum nitrate and ammonia water as solutes respectively; the ammonia water solution is dropwise added to the aluminum nitrate solution; a pH value is adjusted to be 7-10; reaction is performed for 10-50min at 20-50 DEG C; aging is performed for 1-8h at 30-80 DEG C; filtering is performed; washing is performed for 2-6 times by the alcohol water solution; drying is performed for 6-24h at 120 DEG C; and the pseudoboehmite is obtained. The preparation method is simple to operate; aluminum nitrate is taken as a raw material, so that the cost is lowered greatly; alcohol can be recycled, and a byproduct, namely ammonium nitrate has an industrial application value, so that green production can be realized; and a very good effect is obtained.

Description

technical field [0001] The invention relates to a preparation method of pseudo-boehmite. Background technique [0002] Pseudoboehmite is a kind of aluminum hydroxide with fine particles, low crystallinity and wrinkled sheets. It has the characteristics of high specific surface area and large pore volume. It can be used as a material for the production of catalyst supports and activated alumina. Now industrial production is divided into three categories according to different raw materials: 1. Alkaline method, using NaAlO 2 and CO 2 As a reactant, the basic process includes gelation, aging, separation, washing, and drying. Although the raw materials are cheap and the production cost is low, impurities such as iron and sodium are relatively high. 2. The acid method is prepared by neutralizing aluminum salts such as aluminum nitrate and alkaline precipitants such as ammonia water, including steps such as gelling, aging, washing, and drying. This method does not bring in sodi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01F7/02
Inventor 赵继华颜京龙方建沈伟国
Owner 甘肃莱安能源有限公司
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