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Preparation method of spherical aluminum oxide

A technology of spherical alumina and alumina, applied in chemical instruments and methods, catalyst activation/preparation, catalyst carrier, etc., can solve the problems of uneven distribution of gel ball oxides, environmental pollution, uneven products, etc.

Active Publication Date: 2016-02-03
CNOOC TIANJIN CHEM RES & DESIGN INST +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] At present, the method for preparing large pore volume and high-strength spherical alumina in industry is mainly the oil (ammonia) column method, but the production process of this method will have irritating gas discharge, and it needs a long aging process. The process is complex and energy-efficient. High consumption, low efficiency, high cost
[0004] In order to solve the problems of high cost and environmental pollution of the oil (ammonia) column method, patents CN102718241A and CN103864123A disclose a method for spherical carrier molding using the sol-gel properties of alginic acid. This molding method has fast molding speed and high efficiency. High, low cost, no pollution in the preparation process and other advantages
The formation of gel particles by this molding method is entirely due to the principle that alginic acid reacts with more metal cations to form a gel with a three-dimensional network structure. The reaction process first occurs on the surface of the particles to form a dense film, and then the ions pass through. The dense membrane penetrates into the gel particles, which easily causes the internal substances to migrate to the surface driven by alginic acid, resulting in uneven distribution of oxides inside the gel balls, and finally leads to uneven products

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] Disperse 5 g of gellan gum and 300 g of SB powder (pseudo-boehmite) produced by Sasol in Germany in 700 g of deionized water, then heat to 85°C to fully dissolve the gellan gum, and use high-shear stirring to make the liquid evenly quality, to make a stable suspension slurry; add the suspension slurry to the dropping pill machine for dripping, and the droplets solidify in liquid paraffin at 5°C to form gel beads; take out the gel beads and use 0.2wt % aluminum ion curing agent to further enhance the curing treatment for 10 minutes; finally dry at 120°C and bake at 550°C to obtain the product.

[0017] Analyze and characterize the product: particle size: 1.85±0.05mm; pore volume: 0.55ml / g; specific surface area: 240m 2 / g; average strength: 95N / piece; 90% strength distribution: 95-100N / piece; abrasion: 0.05%.

Embodiment 2

[0019] Disperse 150g of SB powder (pseudoboehmite) produced by German Sasol company in 500g of deionized water, add 150g of 3% nitric acid peptization for 1h to make acidic aluminum glue, neutralize the aluminum glue with ammonia water until the pH is 7.5, add 300g to remove Ionized water and 10g of gellan gum were stirred evenly, then heated to 85°C to fully dissolve the gellan gum, and high-shear stirring was used to homogenize the feed liquid to make a stable suspension slurry; the suspension The slurry is added to the dropping pill machine for dripping, and the droplets are solidified in liquid paraffin at 5°C to form gel beads; take out the gel beads, and further strengthen the curing treatment with 0.2wt% aluminum ion curing agent for 10 minutes; finally dry at 120°C , 550 ℃ roasting to obtain the product.

[0020] Analyze and characterize the product: particle size: 1.85±0.05mm; pore volume: 0.75ml / g; specific surface area: 220m 2 / g; average strength: 75N / piece; 90% s...

Embodiment 3

[0022] First, prepare pseudo-boehmite by co-current method of sodium metaaluminate and aluminum sulfate (refer to patent CN94107313.0); take 150 g of pseudo-boehmite and 20 g of gellan gum, disperse them with 1000 g of deionized water, and then heat to 85°C to fully dissolve the gellan gum, and use high-shear stirring to make the material liquid homogeneous to make a stable suspension slurry; add the suspension slurry to the dropping pill machine for dripping, and the liquid drops in the Solidify in liquid paraffin at 5°C to form gel beads; take out the gel beads, and further strengthen the curing treatment with 1wt% aluminum ion curing agent for 10 minutes; finally dry at 120°C and bake at 550°C to obtain the product.

[0023] Analyze and characterize the product: particle size: 1.85±0.05mm; pore volume: 0.95ml / g; specific surface area: 245m 2 / g; average strength: 65N / piece; 90% strength distribution: 58-70N / piece; abrasion: 0.06%.

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Abstract

The invention relates to a preparation method of spherical aluminum oxide. The preparation method comprises the steps of dispersing gellan gum and an aluminum oxide precursor into deionized water, then heating to 70 to 90 DEG C, so that the gellan gum is fully dissolved, and homogenizing feed liquid by adopting homogeneous equipment, so as to prepare suspension slurry with good stability; adding the suspension slurry to a pill dropping machine for dropping, and curing in an organic phase to form gel beads; then further curing the gel beads with a cationic curing agent; finally, drying, and calcining to obtain a product. The forming method has the advantages of high product intensity, good degree of sphericity, large pore volume, no pollution in a preparation process, easiness in industrial production and the like, and operating steps are simple and are easy to implement.

Description

technical field [0001] The invention belongs to the field of catalyst carriers, and relates to a method for preparing spherical alumina, in particular to a method for preparing spherical alumina with large pore volume and high strength. technical background [0002] Alumina is used as a catalyst carrier, and its pore volume and strength are the most basic indicators. In the field of refining and chemical industry, with the inferior and heavy quality of crude oil, alumina with large pore volume is increasingly needed as a carrier to increase the internal diffusion rate, promote the transfer of long-chain molecules, and improve the catalytic activity; in the moving bed reaction In the device, in order to prolong the service life of the catalyst, the carrier also needs to have higher strength and lower wear. [0003] At present, the method for preparing large pore volume and high-strength spherical alumina in industry is mainly the oil (ammonia) column method, but the producti...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J32/00B01J21/04B01J35/08B01J37/00
Inventor 杨文建孙彦民于海斌姜雪丹李晓云孟广莹李世鹏周鹏苏少龙
Owner CNOOC TIANJIN CHEM RES & DESIGN INST
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