Looking for breakthrough ideas for innovation challenges? Try Patsnap Eureka!

Method for improving dispersity of magnesium-aluminum hydrotalcite

A magnesium aluminum hydrotalcite, dispersive technology, applied in the direction of chemical instruments and methods, aluminum compounds, inorganic chemistry, etc., can solve the problems of increasing production costs, unfavorable industrial production, unable to coat magnesium aluminum hydrotalcite crystals, etc., to achieve Coating is sufficient and thorough, and the effect of improving dispersibility

Active Publication Date: 2021-10-22
HUNAN HENGGUANG CHEM
View PDF7 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003]At present, the industry usually conducts surface treatment on the magnesium aluminum hydrotalcite slurry system before drying, so that the surface of the magnesium aluminum hydrotalcite particles can absorb a layer of organic matter, reducing the drying effect. The agglomeration phenomenon, this method is only aimed at solving the agglomeration phenomenon produced in the drying process, but because the magnesium aluminum hydrotalcite crystals have particle agglomeration during the formation process, adding a surface treatment agent after that can not be used for independent magnesium aluminum hydrotalcite crystals Sufficient coating treatment will not significantly improve the dispersibility of the dried magnesium aluminum hydrotalcite product
[0004] Chinese patent CN 111453750 discloses a clean synthesis process of magnesium aluminum hydrotalcite, in which raw materials are processed by ultrasonic dispersion to obtain magnesium aluminum hydrotalcite precursor , so as to improve the dispersibility of the magnesium aluminum hydrotalcite precursor to a certain extent, so as to reduce the degree of agglomeration in the subsequent reaction process, but this method requires the use of corresponding ultrasonic equipment, which will increase the production cost and is not conducive to high-yield industrialization Production, and the magnesium aluminum hydrotalcite precursor after ultrasonic dispersion still needs further reaction, the reaction process and the washing and drying steps experienced after the reaction will further aggravate the agglomeration of magnesium aluminum hydrotalcite

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Method for improving dispersity of magnesium-aluminum hydrotalcite
  • Method for improving dispersity of magnesium-aluminum hydrotalcite

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] A method for preparing magnesium aluminum hydrotalcite, comprising the following steps:

[0024] Step 1. Put the magnesium aluminum hydrotalcite slurry after the reaction into an adiabatic vacuum flash tank, so that the temperature of the magnesium aluminum hydrotalcite slurry is instantly reduced from 95°C to 45°C under the action of flash evaporation, and the low pressure formed by evaporation The steam is discharged into the condenser for condensation.

[0025] Step 2: Pour the magnesium aluminum hydrotalcite slurry obtained after flash evaporation into a surface treatment tank, add stearic acid for surface treatment, and stir at 60° C. for 1 hour. Wherein, the mass of stearic acid added is 1% of the mass of the magnesium aluminum hydrotalcite slurry.

[0026] Step 3: Filtering, washing, drying, and pulverizing the surface-treated magnesium aluminum hydrotalcite slurry in sequence to obtain a highly dispersible magnesium aluminum hydrotalcite product.

Embodiment 2

[0028] A method for preparing magnesium aluminum hydrotalcite, the difference from Example 1 is that in step one, the temperature of magnesium aluminum hydrotalcite slurry is instantly reduced from 105°C to 50°C under the action of flash evaporation, and in step two Stir at 70°C for 2 hours for surface treatment, wherein the mass of stearic acid added to the surface treatment is 3% of the mass of the magnesium aluminum hydrotalcite slurry.

Embodiment 3

[0030] A method for preparing magnesium aluminum hydrotalcite, the difference from Example 1 is that in step one, the temperature of magnesium aluminum hydrotalcite slurry is instantly reduced from 100°C to 48°C under the action of flash evaporation, and in step two Stir at 65°C for 1.5 hours for surface treatment, wherein the mass of stearic acid added to the surface treatment is 2% of the mass of the magnesium aluminum hydrotalcite slurry.

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

PropertyMeasurementUnit
particle sizeaaaaaaaaaa
Login to View More

Abstract

A method for improving the dispersity of magnesium-aluminum hydrotalcite relates to the technical field of magnesium-aluminum hydrotalcite preparation, and comprises the following steps: pumping magnesium-aluminum hydrotalcite slurry after reaction into a heat insulation vacuum flash evaporation kettle, carrying out flash evaporation on the magnesium-aluminum hydrotalcite slurry in a vacuum state, and instantaneously reducing the temperature to a certain range; then pumping magnesium-aluminum hydrotalcite slurry obtained after flash evaporation into a surface treatment tank, adding stearic acid for surface treatment, and stirring at 60-70 DEG C for 1-2 hours; and finally, sequentially filtering, washing, drying and crushing the magnesium-aluminum hydrotalcite slurry subjected to surface treatment to obtain a high-dispersity magnesium-aluminum hydrotalcite product.

Description

technical field [0001] The invention relates to the technical field of magnesium aluminum hydrotalcite preparation, in particular to a method for improving the dispersibility of magnesium aluminum hydrotalcite. Background technique [0002] The chemical composition of magnesium aluminum hydrotalcite is usually expressed as: Mg6Al2(OH)16CO3•4H2O, which can be regarded as a derivative formed by replacing the Mg2+ part of Mg(OH)2 with Al3+, so its structure is similar to Mg(OH)2 Layered structure, the size of primary magnesium aluminum hydrotalcite crystals is generally in the range of 200-500 nanometers, and most of them are synthesized by hydrothermal method in industry. Due to the relatively large surface energy of nanomaterials, they are easy to aggregate together, and because of the preparation process In the process, after the hydrothermal reaction, a large amount of water molecules will remain on the surface of the magnesium aluminum hydrotalcite nanocrystals. The huge s...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Applications(China)
IPC IPC(8): C01F7/00
CPCC01P2004/51
Inventor 曾维兴曹立祥肖元春
Owner HUNAN HENGGUANG CHEM
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Patsnap Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Patsnap Eureka Blog
Learn More
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic, Popular Technical Reports.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com