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Method for preparing high-purity pseudo-boehmite

A pseudo-boehmite, high-purity technology is applied in the field of preparing high-purity pseudo-boehmite, which can solve the problems of difficult control of pore size distribution, high product impurity content, and large washing water consumption, and achieves easy control and solvent toxicity. Low, easy-to-purify effect

Active Publication Date: 2014-12-10
DALIAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, Chinese enterprises generally use the inorganic aluminum salt precipitation method to produce pseudo-boehmite. The preparation steps include gelation, aging, separation, washing and drying. The inorganic aluminum salt precipitation method has simple process and low cost, but the impurity content of the product high (such as Na 2 O content higher than 0.1%, SiO 2 content is higher than 0.1%), the amount of washing water is large (more than 20 tons of washing water is required to produce 1 ton of pseudo-boehmite), and the pore size distribution is not easy to control
The aluminum alkoxide hydrolysis method mainly refers to a kind of high-purity aluminum and higher alcohol (n-pentanol, n-hexanol) developed by the German Coldea company (acquired by Sasol company) as raw materials to produce high-quality pseudo-boehmite; the company The brand product SB powder has high purity (such as Na 2 O content below 0.005%, SiO 2 content is less than 0.02%), good crystal form, large pore volume and specific surface area, and is widely used in the field of catalysis, but the higher alcohol used in this method has certain toxicity, and the production cost is relatively high. There is no report of industrialization in my country

Method used

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Examples

Experimental program
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Effect test

Embodiment 1

[0016] Get 510g aluminum isopropoxide (Na 2 O content is 0.001%wt, Fe 2 o 3 Content is 0.002%wt, SiO 2 Content is 0.005%wt, TiO 2 Content is 0.001%wt) and 100g isopropanol are put into 4L reactor, stir mechanically at 75 ℃, then add hydrolyzate (deionized water quality is 900g in the hydrolyzate, isopropanol quality is 450g, polyethylene Glycol 2000 (mass is 10g), hydrolyzed for 8 hours, and then the hydrolyzed product was transferred to a desiccator and dried at 60°C for 12 hours to obtain high-purity pseudo-boehmite. Al of pseudoboehmite 2 o 3 The content is 72~75%, Na 2 O content is 0.004%wt, Fe 2 o 3 Content is 0.007%wt, SiO 2 Content is 0.016%wt, TiO 2 The content is 0.004%wt, and the specific surface area is 250-270m 2 / g, the bulk density is 700-750g / L, and the pore volume is 0.4-0.45mL / g.

Embodiment 2

[0018] Get 510g aluminum isopropoxide (Na 2 O content is 0.001%wt, Fe 2 o 3 Content is 0.005%wt, SiO 2 Content is 0.005%wt, TiO 2 Content is 0.005%wt) and 1000g isopropanol is put into 4L reactor, mechanically stirs at 65 ℃, then adds hydrolyzate (deionized water quality is 90g in the hydrolyzate, isopropanol quality is 270g, n-octyl The mass of alcohol is 40g, the mass of F127 is 10g), the hydrolysis reaction is 2h, and then the hydrolyzed product is moved into a desiccator, and dried at 240°C for 1h to obtain high-purity pseudo-boehmite. Al of pseudoboehmite 2 o 3 The content is 76-78%, Na 2 O content is 0.004%wt, Fe 2 o 3 Content is 0.017%wt, SiO 2 Content is 0.018%wt, TiO 2 The content is 0.016%wt, and the specific surface area is 450-480m 2 / g, the bulk density is 200-230g / L, and the pore volume is 1.45-1.50mL / g.

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Abstract

The invention belongs to the technical field of inorganic materials and relates to a method for preparing high-purity pseudo-boehmite. The method for preparing the high-purity pseudo-boehmite comprises the following steps: under the condition of stirring, adding hydrolysate containing a pore-forming agent into an aluminium isopropoxide-isopropanol solution according to a given ratio, and carrying out hydrolysis reaction at the temperature of 60-80 DEG C for 2-8 hours, wherein the hydrolysate containing the pore-forming agent is prepared from deionized water and isopropanol in a mass ratio of 1:(0.5-3) and in ratio by amount of substance of (2-20):1; drying hydrolysis products at the temperature of 60-260 DEG C, so that the high-purity pseudo-boehmite is obtained. The method for preparing the high-purity pseudo-boehmite has the advantages that no waste is discharged in the whole preparation process, and an environment-friendly technology is realized; and meanwhile, a reaction flow is simple, and control is easy.

Description

technical field [0001] The invention belongs to the technical field of inorganic material preparation, and relates to a method for preparing high-purity pseudo-boehmite. Background technique [0002] Pseudoboehmite, also known as monohydrate alumina, pseudo-boehmite, is one of the important categories of chemical alumina. Pseudo-boehmite is mainly used as a raw material for making catalysts, such as a binder or catalyst carrier for cracking, hydrogenation and reforming catalysts in the petrochemical industry; in the nitrogen fertilizer production industry, pseudo-boehmite is used for ammonia production Catalyst carrier; In terms of environmental protection, pseudo-boehmite is widely used in the preparation of catalysts for automobile exhaust purification. [0003] The production methods of pseudo-boehmite mainly include inorganic aluminum salt precipitation and aluminum alkoxide hydrolysis. At present, Chinese enterprises generally use the inorganic aluminum salt precipita...

Claims

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Application Information

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IPC IPC(8): C01F7/02
Inventor 宁桂玲田朋田俊英林源庞洪昌
Owner DALIAN UNIV OF TECH
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