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Preparation method for magnesium-aluminium hydrotalcite

A technology of magnesium-aluminum hydrotalcite and aluminum chloride, applied in the direction of alumina/aluminum hydroxide, etc., can solve the problems of large metal salt, high cost, low atomic utilization rate, etc., and achieve high atomic utilization rate and reduce industrialization cost. Effect

Inactive Publication Date: 2012-11-28
ZHEJIANG UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] In summary, in the existing methods for preparing magnesium-aluminum hydrotalcite, the magnesium sources used are mostly metal salts, and more are metal salts containing multiple crystal waters. When a large amount of hydrotalcite needs to be synthesized, the required The amount of metal salt is relatively large, which makes the cost high and the utilization rate of atoms is low, which is not suitable for industrial production

Method used

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  • Preparation method for magnesium-aluminium hydrotalcite
  • Preparation method for magnesium-aluminium hydrotalcite
  • Preparation method for magnesium-aluminium hydrotalcite

Examples

Experimental program
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Effect test

Embodiment 1

[0034] Example 1: Preparation of hydrotalcite with a magnesium-aluminum ratio of 2:1

[0035] Take 8.0gMgO and 24.0gAlCl 3 ·H 2 O, AlCl 3 ·H 2 Dissolve O in 200ml of distilled water, add MgO with stirring at 80°C, and adjust the pH after reacting for 2.5 hours. Take 2mol / L NaOH solution to adjust pH=9.18. After continuing to react for two and a half hours, it was crystallized at 60°C for 18 hours. After suction filtration and washing for 4 times, drying at 60° C. for 12 hours and grinding to obtain magnesium aluminum hydrotalcite. See XRD diagram figure 1 .

Embodiment 2

[0036] Example 2: Preparation of hydrotalcite with a magnesium-aluminum ratio of 2:1

[0037]Take 8.0gMgO and 24.0gAlCl 3 ·H 2 O, AlCl 3 ·H 2 Dissolve O in 400ml of distilled water, add MgO with stirring at 60°C, and adjust the pH after reacting for 2.5 hours. Take 2mol / L NaOH solution NaOH to adjust pH=9.18. After continuing the reaction for two and a half hours, it was crystallized at 80°C for 12 hours. After suction filtration and washing for 4 times, drying at 80° C. for 12 hours and grinding to obtain magnesium aluminum hydrotalcite.

Embodiment 3

[0038] Example 3: Preparation of hydrotalcite with a magnesium-aluminum ratio of 2:1

[0039] Take 4.0gMgO and 12.0gAlCl 3 ·H 2 O, AlCl 3 ·H 2 O was dissolved in 400ml of distilled water, and MgO was added with stirring under heating at 40°C, and the pH was adjusted after reacting for 4 hours. Take 2mol / L NaOH solution NaOH to adjust pH=9.18. After continuing the reaction for three hours, the crystallization was carried out at 60° C. for 24 hours. After suction filtration and washing for 4 times, drying at 60° C. for 20 hours and grinding to obtain magnesium aluminum hydrotalcite.

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Abstract

The invention discloses a preparation method for magnesium-aluminium hydrotalcite and the method comprises the following steps: (1) preparing an aluminium chloride aqueous solution with the concentration of 0.24-0.3g / ml, adding magnesium oxide to the aluminium chloride aqueous solution according to the mole ratio of Mg: Al being 2-3:1, heating and stirring at the constant temperature of 40-80 DEG C for 2-4 hours, and obtaining a mixed solution; (2) adjusting the pH value of the mixed solution obtained in step (1) to be 9-10, and keeping on the reaction at 40-80 DEG C for 2-4 hours; (3) crystallizing the seriflux obtained after the reaction in step (2) at a constant temperature of 60-80 DEG C for 12-24 hours; (4) filtering the reaction solution obtained after the crystallization in step (3), washing, drying and grinding to obtain the magnesium-aluminium hydrotalcite. According to the method of the invention, the raw materials used is low cost and easy to get, and the atom conversion rate high, and industrialization cost can be reduced.

Description

(1) Technical field [0001] The invention relates to a preparation method of magnesium aluminum hydrotalcite. (2) Technical background [0002] Hydrotalcite (LDH for short), also known as layered double hydroxide. It is an anionic layered structure material composed of interlayer anions and positively charged laminates. Two or more positively charged metal ions and six hydroxyl groups share an octahedral edge. Its laminates are doped with negatively charged organic and inorganic anions or water molecules between the layers. Its chemical composition is [M 2+ 1-x m 3+ x (OH) 2 ] x+ (A x / n n- )·mH 2 O, where M is a metal element, which can be a trivalent or divalent metal ion; A n- is an interlayer anion. The volume, quantity, valence state of the anion and its bonding strength with the hydroxyl group of the laminate determine the interlayer distance and interlayer space of LDHs; x is M 3+ / (M 2+ +M 3+ ), generally between 0.2 and 0.33; and water molecules exist i...

Claims

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Application Information

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IPC IPC(8): C01F7/02
Inventor 王力耕杨超鸿胡军倪哲明施炜
Owner ZHEJIANG UNIV OF TECH
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