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Clean method for preparing borate intercalation hydrotalcite-like compound

A hydrotalcite compound and borate intercalation technology, which is applied in the direction of alumina/aluminum hydroxide, can solve the problems of washing water consumption and low use value, and achieve the effect of saving washing water and protecting the environment

Active Publication Date: 2010-09-15
北京泰克来尔科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The co-precipitation method has the following disadvantages: (1) a large amount of inorganic sodium salts with low utilization value are produced by-product while the mixed salt solution and the mixed alkali solution co-precipitate to generate LDHs; (2) in order to obtain pure HTs products, it is necessary to process the precipitated product Repeated washing consumes a lot of washing water; (3) a large amount of salty mother liquor needs to be treated to meet the discharge standard
There is no report on the clean preparation of borate intercalated HTs, and the development of an environmentally friendly method for the preparation of borate intercalated HTs has important practical and long-term significance

Method used

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  • Clean method for preparing borate intercalation hydrotalcite-like compound

Examples

Experimental program
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Effect test

Embodiment 1

[0023] Step A: Mg(OH) 2 , Al(OH) 3 and H 3 BO 3 Mix according to the ratio of Mg / Al molar ratio of 2:1 and B / Al molar ratio of 3:1, take 10g of the mixture and place it in 80g of deionized water to make a highly dispersed suspension and transfer it to the reactor;

[0024] Step B: Control the temperature rise under stirring conditions. When the temperature rises to 105°C, remove the air in the reaction system through the exhaust valve, continue to heat up to 200°C, and react for 24 hours. The reaction slurry is directly filtered and dried at 70°C. 24h, get B with Mg / Al=2 3 o 3 (OH) 4 - Intercalated hydrotalcite-like compounds.

Embodiment 2

[0026] Step A: Mg(OH) 2 , Al(OH) 3 and H 3 BO 3 Mix according to the ratio of Mg / Al molar ratio of 2:1, B / Al molar ratio of 3:1, take 10g of the mixture and place it in 80g of deionized water to make a highly dispersed suspension and transfer it to the reactor;

[0027] Step B: Control the temperature rise under stirring conditions. When the temperature rises to 100°C, remove the air in the reaction system through the exhaust valve, continue to heat up to 220°C, and react for 6 hours. The reaction slurry is directly filtered and dried at 80°C 4h, get B with Mg / Al=2 3 o 3 (OH) 4 - Intercalated hydrotalcite-like compounds.

[0028] The crystal structure of the sample was characterized by XRD-6000 X-ray powder diffractometer from Shimadzu Corporation, Japan. figure 1 is the XRD spectrum of the obtained sample, as can be seen from the figure, (003), (006), (012), (015), (018), (110 ) and (113) crystal plane diffraction peaks appear at 2θ=10.1°, 20.2°, 34.6°, 38.0°, 43.8°,...

Embodiment 3

[0033] Step A: Mg(OH) 2 , Al(OH) 3 and H 3 BO 3 Mix by Mg / Al molar ratio of 3:1, B / Al molar ratio of 3.2:1, take 10g of the mixture and place it in 80g of deionized water to make a highly dispersed suspension and transfer it to the reactor;

[0034] Step B: Control the temperature rise under stirring conditions. When the temperature rises to 98°C, remove the air in the reaction system through the exhaust valve, continue to heat up to 220°C, and react for 4 hours. The reaction slurry is directly filtered and dried at 60°C. 4h, get B with Mg / Al=3 3 o 3 (OH) 4 - Intercalated hydrotalcite-like compounds.

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Abstract

The invention discloses a clean method for preparing a borate intercalation hydrotalcite-like compound. By using the adjustability of interlaminar anions of the hydrotalcite-like compound and based on atom economic reaction, the borate intercalation hydrotalcite-like compound with the interlaminar anions B(OH)4<-> and / or B3O3(OH)4<-> is generated by inserting borate ions into interlamination of the hydrotalcite-like compound. All atoms in raw materials enter in the reaction to generate the target product in the preparation process without byproducts; and a purified product can be obtained by directly filtering and drying the product without washing, so washing water is greatly saved and the environment is protected.

Description

technical field [0001] The invention belongs to the technical field of preparation of inorganic non-metallic functional materials, and in particular relates to a clean preparation method of borate intercalation hydrotalcite-like compounds. Background technique [0002] Hydrotalcite-like compounds (HTs for short), also known as anionic clays, are composed of OH - / Octahedrally coordinated divalent and trivalent metal ions (M II and M III ) array composed of positively charged brucite-like main laminates ([M II 1-x m III x (OH) 2 ] x+ ) and the interlayer guest hydrated anion (A n- ) composed of a class of anionic layered materials, its chemical composition can be expressed as the general formula: [M 2+ 1-x m 3+ x (OH) 2 ]A n- x / n mH 2 O, usually abbreviated as M II m III -A-HTs. The tunability of host laminates and the exchangeability of guest anions between layers are the main features of hydrotalcite-like compounds. By adjusting the type and composition...

Claims

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Application Information

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IPC IPC(8): C01F7/02
Inventor 吕志陈秋华林彦军宋家庆徐向宇
Owner 北京泰克来尔科技有限公司
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