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Low-density spherical alumina and preparation method thereof

A spherical alumina, low-density technology, applied in the preparation of alumina/hydroxide, chemical instruments and methods, alkali metal oxide/hydroxide, etc., can solve the problems of product purity decline, pore volume is not large, etc. , to achieve the effects of inhibiting high temperature sintering and shrinkage, large pore volume, and low bulk density

Pending Publication Date: 2021-12-10
BEIJING UNIV OF CHEM TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In this preparation method, the alumina molding process needs to be carried out in an aqueous solution containing metal ions, which will additionally introduce hetero ions, resulting in a decrease in product purity, and the pore volume is not very large

Method used

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  • Low-density spherical alumina and preparation method thereof
  • Low-density spherical alumina and preparation method thereof
  • Low-density spherical alumina and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0039] (1) Add 132g of aluminum powder with a particle size of 1-200 μm into 15% dilute hydrochloric acid solution, and prepare refined aluminum sol at 90°C for 3 hours through the magnetic separation continuous refining device provided by Chinese patent CN1746111A. Al in refined aluminum sol 3+ The mass fraction is 12%, and the Al / Cl mass ratio is 0.91.

[0040] (2) Weigh 43.68 g of silica sol with a mass fraction of 30 wt %, add it into the refined aluminum sol obtained in step (1) and stir well to obtain a mixed aluminum sol. At 0°C, 330g of hexamethylenetetramine aqueous solution with a mass fraction of 40% was added to the mixed aluminum sol to obtain the sol to be formed, Al:

[0041](3) The sol to be formed obtained in step (2) was dropped into hot oil at 90°C through a dispersing needle to form it, and the preliminarily cured pellets were taken out, and aged at 120°C and 0.5 MPa for 10 hours. The aged pellets were washed with deionized water to 1% AgNO 3 Check the...

Embodiment 2

[0043] (1) Add 132g of aluminum powder with a particle size of 1-200 μm to 20% dilute hydrochloric acid solution, and prepare refined aluminum sol at 90° C. for 3 hours through the magnetic separation continuous refining device provided by Chinese patent CN1746111A. Al in refined aluminum sol 3+ The mass fraction is 12%, and the Al / Cl mass ratio is 0.91.

[0044] (2) Add 133.1g of silica sol with a mass fraction of 20% to the fine aluminum sol obtained in step (1) and fully stir to obtain a mixed aluminum sol. At 5°C, 330g of hexamethylene with a mass fraction of 30% The base tetramine aqueous solution is added in the mixed aluminum sol to obtain the sol to be shaped, Al:

[0045] (3) Drop the unmolded sol obtained in step (2) into hot oil at 90°C through a dispersing needle for molding, take out the preliminarily solidified pellets and age at 140°C, 0.6MPa for 8 hours. The aged pellets were washed with deionized water until no visible precipitation was detected in the was...

Embodiment 3

[0047] (1) Add 132g of aluminum powder with a particle size of 1-200 μm to 20% dilute hydrochloric acid solution, and prepare refined aluminum sol at 90° C. for 3 hours through the magnetic separation continuous refining device provided by Chinese patent CN1746111A. Al in refined aluminum sol 3+ The mass fraction is 12%, and the Al / Cl mass ratio is 0.68.

[0048] (2) Weigh 4.4579g of boric acid, add it into the refined aluminum sol obtained in step (1) and stir fully to obtain a mixed aluminum sol. Mix the obtained mixed aluminum sol with 300 g of hexamethylenetetramine solution with a mass fraction of 30% at 5°C to obtain the sol to be formed, Al:

[0049] (3) Drop the unmolded sol obtained in step (2) into hot oil at 90°C through a dispersing needle for molding, take out the preliminarily solidified pellets and age at 150°C, 0.6MPa for 12 hours. The aged pellets were washed with deionized water until no visible precipitation was detected in the washing water with 1% AgNO...

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Abstract

The invention discloses low-density alumina and a preparation method thereof. The preparation method comprises the following steps: on the basis of preparing spherical alumina by an oil column forming method, adding an inorganic or organic auxiliary agent in a forming sol preparation process, wherein Al-O-M chemical bonds are formed in alumina due to the addition of the inorganic auxiliary agentso as to inhibit high-temperature sintering and shrinkage of the alumina to make the alumina have a larger pore channel structure, the added organic auxiliary agent is released from the sphere in the aging and roasting processes so as to form a richer pore structure, the particle size of the spherical alumina carrier is 0.02-5 mm, the bulk density is 0.20-0.50 g / cm<3>, the crushing strength is 30-90 N / particle, the pore volume is 0.3-1.5 cm<3> / g, and the pore diameter is 10-40 nm. Compared with spherical alumina prepared without addition of an auxiliary agent, the spherical alumina prepared by the invention has lower bulk density and larger pore volume. The spherical alumina is mainly used as industrial catalyst carriers or adsorbents in multiple fields.

Description

technical field [0001] The invention belongs to the field of preparation of inorganic materials, and in particular relates to a low-density alumina and a preparation method thereof. The material is mainly used as a multi-field industrial catalyst carrier or adsorbent. Background technique [0002] Alumina is widely used in the field of catalysis and adsorption because of its large specific surface area and abundant surface active sites. The powdered alumina is not easy to recycle, and it is easy to cause congestion and accumulation. Therefore, it is often used in industry after molding. The commonly used shaped alumina is spherical, strip-shaped, gear-shaped, honeycomb, etc., and the spherical alumina is in the bed. Evenly stacked in the middle, not easy to form channel flow, can effectively reduce the pressure drop of the bed layer, improve the mass transfer effect, so it is the most widely used in industry. At present, the commonly used molding methods for preparing sphe...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J21/04B01J21/12B01J35/02B01J35/08B01J35/10C01F7/30B82Y30/00B82Y40/00B01J20/02B01J20/08B01J20/10B01J20/28B01J20/30B01J35/00
CPCB01J21/12B01J21/04B01J20/08B01J20/103B01J20/02C01F7/306C01F7/30B01J20/28061B01J20/28073B01J20/28076B01J20/28083B82Y40/00B82Y30/00C01P2004/03C01P2006/12C01P2006/14C01P2006/16B01J35/51B01J35/40B01J35/638B01J35/635B01J35/647B01J35/615
Inventor 冯拥军张港李殿卿
Owner BEIJING UNIV OF CHEM TECH
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