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Preparation method for magnesia-alumina spinel

A technology of magnesium-aluminum spinel and aluminum compound, which is applied in the field of desulfurization, can solve the problems of lack of lattice structure and low overall strength of magnesium-aluminum spinel compound, and achieves the effect of stable crystal structure, meeting strength requirements and high strength

Active Publication Date: 2013-07-17
SHENYANG SANJUKAITE CATALYST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the above-mentioned technology, magnesium-aluminum spinel is prepared by acid secondary treatment, and the specific surface area of ​​the magnesium-aluminum spinel compound prepared by this method is verified by experiments; however, in the above-mentioned preparation method, due to magnesium or aluminum It exists in an ionic state in an acidic environment, so it is prepared as MgAl 2 o 4 The latter aluminum-rich part can only exist in MgAl 2 o 4 around and unable to enter MgAl 2 o 4 The lattice structure of the magnesium aluminum spinel compound leads to a lower overall strength

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] (1) Weigh 200g of alumina and 49g of magnesia, and mix them evenly;

[0027] (2) Prepare 125g of hydrochloric acid solution with a mass percentage of 5%, add it to the mixture in step (1), and stir evenly to form a slurry;

[0028] (3) The slurry obtained in the step (2) was neutralized for 2 hours with a 5% potassium hydroxide solution by mass percentage;

[0029] (4) Filter the product obtained in step (3), wash the filter cake, dry at 170°C for 2 hours, and roast at 450°C for 6 hours to obtain magnesium aluminum spinel compound 1#.

Embodiment 2

[0031] (1) Weigh 200g of alumina waste agent 58g of magnesium hydroxide, and mix the two evenly;

[0032] (2) Prepare 130 g of nitric acid solution with a mass percentage of 8% and add it to the mixture in step (1), stir evenly to form a slurry;

[0033] (3) neutralizing the slurry obtained in step (2) with 8% sodium hydroxide solution for 2 hours by mass percent;

[0034] (4) Filter the product obtained in step (3), wash the filter cake, dry at 170°C for 2 hours, and roast at 450°C for 6 hours to obtain magnesium aluminum spinel compound 2#.

Embodiment 3

[0036] (1) Weigh 200g of aluminum hydroxide and 108g of magnesium nitrate, and mix them evenly;

[0037] (2) Prepare 145g of citric acid solution with a mass percentage of 10% and add it to the mixture in step (1), stir evenly to form a slurry;

[0038] (3) neutralizing the slurry obtained in step (2) with 10% ammonia solution by mass percent for 2 hours;

[0039] (4) Filter the product obtained in step (3), wash the filter cake, dry at 170°C for 2 hours, and roast at 450°C for 6 hours to obtain magnesium aluminum spinel compound 3#.

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Abstract

The invention relates to a preparation method for magnesia-alumina spinel. The preparation method comprises the steps of: firstly, evenly mixing alumina-containing compound and magnesium-containing compound according to the mole ratio of Al:Mg being 3.2:1-3.92:1; then adding acid solution, and stirring evenly into size; then neutralizing the size with alkali liquor; and finally, filtering the neutralized product, washing, drying and roasting a filter cake to obtain the magnesia-alumina spinel. According to the preparation method for the magnesia-alumina spinel, the alkali liquor can be added after the acid solution is added, the aluminum source can be directly doped into crystal lattices of the aluminum-magnesium crystals in the crystal nucleus growth process of the aluminum-magnesium crystals, so that the strength of the prepared magnesia-alumina spinel compound is larger, the crystal structure is more stable, thereby better meeting the strength requirement of a hydrogenated desulfurization catalyst to a carrier.

Description

technical field [0001] The invention relates to a preparation method of a magnesium aluminum spinel compound, belonging to the technical field of desulfurization. Background technique [0002] In recent years, with the deterioration of petroleum raw materials, the content of sulfur impurities in raw materials has been increasing. Therefore, in the process of petroleum refining, the flue gas discharged into the atmosphere contains more and more SO X Harmful gas, seriously pollute the environment. With the enhancement of residents' awareness of environmental protection and the increasingly stringent emission standards of harmful gases, the requirements for clean fuel production are getting higher and higher, and the restrictions on sulfur content are becoming stricter. Therefore, various desulfurization methods have emerged as the times require. [0003] At present, the most important desulfurization method in the petroleum refining process is still hydrodesulfurization, that...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01F7/16B01J32/00
Inventor 张楠
Owner SHENYANG SANJUKAITE CATALYST
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