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A kind of preparation method of macroporous alumina microsphere

A technology of alumina and large pore volume, which is applied to the preparation of microspheres, chemical instruments and methods, microcapsule preparations, etc., can solve the problems of affecting the catalytic effect of microspheres and the low pore volume of γ-alumina microspheres, and achieve the goal of preparing The effect of simple process and low cost

Active Publication Date: 2019-05-28
CHINA NAT OFFSHORE OIL CORP +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Most of the existing methods adopt the methods of acid dissolution, neutralization, and spraying, and the pore volume of the prepared γ-alumina microspheres is low, generally lower than 0.5ml / g, which affects the catalytic effect of the microspheres

Method used

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  • A kind of preparation method of macroporous alumina microsphere
  • A kind of preparation method of macroporous alumina microsphere

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] Add 500g of amorphous alumina to 2000g of deionized water and beat and disperse to obtain an alumina slurry, slowly add 60g of nitric acid with a concentration of 63% to the rapidly stirred alumina slurry, heat to 50°C for 8 hours; then add 32g of Uroto product, 6g PEG, 100g liquid paraffin, fully emulsified in an emulsifier to obtain an emulsified suspension; use a centrifugal spray dryer for spray granulation to obtain a precursor of alumina microspheres; finally, the obtained precursor was roasted at 550 ° C for 6h The γ-alumina microspheres were obtained; the specific surface, pore volume, pore size, particle size and wear index are shown in Table 1.

Embodiment 2

[0021] Add 500g of amorphous alumina to 2000g of deionized water and beat and disperse to obtain alumina slurry, slowly add 100g of nitric acid with a concentration of 63% to the rapidly stirred alumina slurry, heat to 60°C for 3 hours; then add 60g of Uroto product, 3g PEG, 60g liquid paraffin, fully emulsified in an emulsifier to obtain an emulsified suspension; use a centrifugal spray dryer for spray granulation to obtain a precursor of alumina microspheres; finally, the obtained precursor was roasted at 600°C for 6h The γ-alumina microspheres were obtained; the specific surface, pore volume, pore size, particle size and wear index are shown in Table 1.

Embodiment 3

[0023] Add 500g of amorphous alumina to 9500g of deionized water and beat and disperse to obtain alumina slurry, slowly add 180g of nitric acid with a concentration of 63% to the rapidly stirred alumina slurry, heat to 60°C for 3 hours; then add 27g of Uroto product, 10g Tween80, 150g liquid paraffin, fully emulsified in an emulsifier to obtain an emulsified suspension; spray granulation with a centrifugal spray dryer to obtain a precursor of alumina microspheres; finally, the obtained precursor was roasted at 500 ° C for 8 hours The γ-alumina microspheres were obtained; the specific surface, pore volume, pore size, particle size and wear index are shown in Table 1.

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Abstract

The invention provides a method for preparing large pore volume alumina microspheres, which includes adding acid peptization to amorphous alumina to prepare aluminum glue, and adding high-temperature decomposable alkaline substances, surfactants, and liquid paraffin to the aluminum glue. , fully homogenized and emulsified to form an emulsified suspension, which is then pumped into a spray dryer for spray granulation to obtain an alumina microsphere precursor. The obtained alumina microsphere precursor is then roasted at high temperature to produce macropores. Alumina microspheres. The microspheres obtained by the preparation method of the present invention have large pore volume, high sphericity, good fluidity and narrow particle size distribution range, and the preparation method is simple and the production cost is low.

Description

technical field [0001] The invention belongs to the field of preparation of inorganic materials, and relates to a method for preparing alumina microspheres with large pores. Background technique [0002] γ-alumina microspheres are a widely used chemical product with suitable pore structure and specific surface area, and are widely used as adsorbents and catalyst supports, especially in fluidized bed reactors in the catalyst industry. [0003] The original production method of γ-alumina microspheres is made by crushing large balls. The particle size of this kind of products is uneven and the sphericity is poor, which leads to high abrasion and low recovery rate of finished products, which directly affects the use effect. Now it is basically Do not use. Subsequently, a sugar-coating machine rolling granulation method was developed to produce gamma-alumina microspheres, but the products obtained by this method are usually 1 mm or larger, and it is difficult to control the micr...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J13/02B01J13/04B01J21/04B01J35/10
CPCB01J13/02B01J13/04B01J21/04B01J35/615B01J35/635B01J35/647
Inventor 孙彦民李晓云于海斌刘艳孟广莹杨文建姜雪丹刘洋苏少龙
Owner CHINA NAT OFFSHORE OIL CORP
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