Method for preparation of high-purity pseudo-boehmite adhesive

A pseudo-boehmite, high-purity technology is applied in the field of preparation of pseudo-boehmite adhesives, which can solve problems such as inability to meet the requirements of adhesive products, and achieve the effects of easy control of peptization index, simple operation process and easy control.

Inactive Publication Date: 2018-02-23
DALIAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Previously, the pseudo-boehmite prepared in our patent "A Method for Preparing High-Purity Pseudo-Boehmite" can only reach 70% in terms of peptization index, and the sol-gel thixotropy is greater than 24 hours , still unable to meet the requirements of adhesive products

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] Take 1020g aluminum isopropoxide (Na 2 O content is not higher than 0.004%wt) and 200g of isopropanol are put into a 3L reactor, stirred and dissolved at 50~75℃, and then added to the hydrolyzate for 5~8h after hydrolysis reaction, the hydrolysate is heated at 90℃ with additives It is aged for 24 hours under the existing conditions, and then the solid product after aging is transferred to a desiccator and dried at 60°C for 12 hours to obtain a high-purity pseudo-boehmite adhesive. Al of pseudo-boehmite 2 O 3 The content is 65~75%, Na 2 O content is not higher than 0.015%wt, specific surface area is 230~250m 2 / g, the bulk density is 760~790kg / m 3 , The pore volume is 0.45~0.5mL / g, the peptization index reaches more than 99%, and the sol-gel thixotropy is less than 90 minutes.

Embodiment 2

[0024] Take 1020g aluminum isopropoxide (Na 2 O content is not higher than 0.004%wt) and 1000g isopropanol are put into a 3L reactor, mechanically stirred at 55~65℃, and then hydrolyzed solution is added, the hydrolysis reaction is 2h, and the hydrolyzed product is present at 60℃ and additives It is aged for 2 hours under the conditions, and then the aged product is transferred to a desiccator and dried for 1 hour at 180-240°C to obtain a high-purity pseudo-boehmite adhesive. Al of pseudo-boehmite 2 O 3 The content is 75~78%, Na 2 O content is not higher than 0.015%wt, specific surface area is 250~340m 2 / g, the bulk density is 790-810 / L, the pore volume is 0.8-1.2 mL / g, the peptization index reaches more than 99%, and the sol-gel thixotropy is less than 90 minutes.

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Abstract

The invention provides a method for preparation of a high-purity pseudo-boehmite adhesive, and belongs to the technical field of inorganic functional materials. The product prepared by the method is high in purity, the gel solubility index and the thixotropy are easily controlled, and the requirements for pseudo-boehmite used in the adhesive in domestic and overseas catalyst fields can be met. Nowaste is discharged in the whole preparation process, and the method is an environment-friendly technology; at the same time, the preparation process is simple, the operation process is simple and thecost is low. The method shows significant competitive advantages and profit space in terms of the manufacturing cost and environmental friendliness, especially is of great significance in the aspectof achieving domestic production of the seudo-boehmite adhesive used in catalysts. Moreover, the adopted raw materials are low-carbon-alcohol aluminum alkoxide, and compared with the process using long-chain aluminum alkoxide, the high-purity pseudo-boehmite adhesive prepared by the method has the advantages of being low in toxicity and easy to purify.

Description

Technical field [0001] The invention belongs to the technical field of inorganic functional materials, and particularly relates to a preparation method of pseudo-boehmite adhesive. Background technique [0002] Pseudo-boehmite, also known as alumina monohydrate, is an important catalyst raw material and is widely used in petrochemical fields such as catalytic cracking, hydrogenation, and reforming. In addition to being an important catalyst carrier, pseudo-boehmite is also the main adhesive for making many other acid catalysts, and has an important role to play. [0003] The technical parameters of pseudo-boehmite when used as an adhesive are significantly different from those when used as a catalyst carrier. As an adhesive, more attention is paid to purity, peptization index, and gel thixotropy. The production methods of pseudo-boehmite for adhesives mainly include alkoxide hydrolysis and inorganic aluminum salt precipitation. Although the inorganic aluminum salt precipitation m...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01F7/02
CPCC01F7/30C01P2006/12C01P2006/14C01P2006/80C01P2006/90
Inventor 宁桂玲庞洪昌田朋孙彩霞
Owner DALIAN UNIV OF TECH
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