New method for preparing magnesium-aluminum hydrotalcite

A technology of magnesium aluminum hydrotalcite and magnesium hydroxide, which is applied in chemical instruments and methods, aluminum compounds, inorganic chemistry, etc., can solve the problems of difficult washing and filtration, high reaction cost, unfavorable environmental protection, etc., and achieve high product purity and process Mature, energy-saving effect

Active Publication Date: 2013-07-17
ZHEJIANG HAIHONG HLDG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] This type of reaction is an acid-base reaction, and the reaction is easy to carry out, but the product is colloidal, difficult to wash and filter, and the reaction consumes a large amount of sodium hydroxide, which generates low-value NaCl with Cl- and SO42- in the raw material and Na2SO4, on the one hand, it is not conducive to environmental protection, on the other hand, the reaction cost is too high

Method used

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  • New method for preparing magnesium-aluminum hydrotalcite
  • New method for preparing magnesium-aluminum hydrotalcite

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] Take a 500mL three-neck flask, add 160mL of 0.5mol / L aluminum chloride solution, add dropwise 120mL of 2mol / L ammonia water at 60°C, filter and wash twice after the addition, put the gelatinous aluminum hydroxide into 1L Take another 500mL three-neck flask, add 100mL of 2mol / L magnesium chloride solution, add 200mL of 2mol / L ammonia water dropwise at 60°C, filter and wash twice to obtain superfine magnesium hydroxide, and Magnesium was put into a 1L reaction kettle for later use; another 500mL three-neck flask was taken, and 20mL of 2mol / L magnesium chloride solution was added, and 40mL of 2mol / L ammonia water was added dropwise at 60°C. Carbon dioxide gas until the magnesium hydroxide is completely dissolved. Pour the clear solution into the above-mentioned 1L reaction kettle, cover and stir at 60°C for 2h, then add a surface modifier for modification, stir for 1h, and dry with a spray dryer.

Embodiment 2

[0030] Take a 500mL three-neck flask, add 160mL of 0.5mol / L aluminum nitrate solution, add 120mL of 2mol / L ammonia water dropwise at 70°C, filter and wash twice after the addition, put the gelatinous aluminum hydroxide into 1L of reaction Take another 500mL three-neck flask, add 100mL of 2mol / L magnesium chloride solution, add 200mL of 2mol / L ammonia water dropwise at 70°C, filter and wash twice to obtain superfine magnesium hydroxide, and Put it in a 1L reaction kettle for later use; take another 500mL three-neck flask, add 20mL of 2mol / L magnesium chloride solution, add 40mL of 2mol / L ammonia water dropwise at 70°C, filter and wash after the addition, add a small amount of water to stir, and pass through carbon dioxide Gas until the magnesium hydroxide is completely dissolved. Pour the clear solution into the above-mentioned 1L reaction kettle, cover and stir at 70°C for 2 hours, then add a surface modifier for modification, stir for 1 hour, and dry with a spray dryer.

Embodiment 3

[0032] Take a 500mL three-necked flask, add 160mL of 0.5mol / L aluminum chloride solution, add dropwise 120mL of 2mol / L ammonia water at 90°C, filter and wash twice after the addition, put the gelatinous aluminum hydroxide into 1L Take another 500mL three-neck flask, add 100mL of 2mol / L magnesium chloride solution, add 200mL of 2mol / L ammonia water dropwise at 90°C, filter and wash twice to obtain superfine magnesium hydroxide, and Put the magnesium into a 1L reaction kettle for later use; take another 500mL three-neck flask, add 20mL of 2mol / L magnesium chloride solution, add 2mol / L ammonia water 40mL dropwise at 90°C, filter and wash after the dropwise addition, add a small amount of water to stir, and pass Carbon dioxide gas until the magnesium hydroxide is completely dissolved. Pour the clear solution into the above-mentioned 1L reaction kettle, cover and stir at 90°C for 2 hours, then add a surface modifier for modification, stir for 1 hour, and dry with a spray dryer.

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Abstract

The invention relates to a method for preparing magnesium-aluminum hydrotalcite, comprising the following steps of: (a) adding aluminium hydroxide gel and magnesium hydroxide together to a reactor; (b) adding magnesium hydrogen carbonate to the reactor; (c) adjusting the temperature of the reactor at 60-90 DEG C and heating and stirring for 1-2 hours; (d) obtaining a white precipitate, i.e., hydrotalcite, and drying by a spray dryer. The invention has the following advantages: the generated hydrotalcite has no impurities, does not need to be washed; the particle is fine and does not need follow-up smashing; the obtained product is dried by the mist spray and the loss during the washing and drying operation in the traditional method is reduced.

Description

technical field [0001] The invention belongs to the technical field of hydrotalcite, and mainly relates to a new method for preparing magnesium aluminum hydrotalcite. Background technique [0002] The hydrotalcite that exists in nature is a hydroxycarbonate of magnesium and aluminum, also known as magnesium aluminum hydrotalcite, and its theoretical molecular formula is Mg6Al2(OH)16CO3·4H2O. Magnesium-aluminum hydrotalcite is an anionic layered compound. The interlayer anions are exchangeable, and the interlayer spacing shows different regular changes with different interlayer ions. Therefore, the hydrotalcite can be made by changing the interlayer ions and the interlayer spacing. It presents different physical and chemical properties to adapt to a wider range of applications. [0003] Hydrotalcite has been used more and more widely as an inorganic flame retardant and PVC heat stabilizer, and is a new type of inorganic functional material. At present, the method of produci...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01F7/00
Inventor 董梅陈海贤
Owner ZHEJIANG HAIHONG HLDG
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