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Method for preparing low-specific surface area magnesium hydroxide flame retardant by using microchannel reactor

A technology of microchannel reactor and low specific surface area, applied in the direction of magnesium hydroxide, etc., can solve the problems of amplification effect, magnesium hydroxide cannot meet the requirements of high-grade magnesium hydroxide flame retardant, long reaction time, etc., and reach the particle size The effect of narrow distribution, controllable average particle size and high utilization rate of raw materials

Active Publication Date: 2014-03-26
DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] In the above-mentioned disclosed technology, only microchannel reactors are used without hydrothermal process, and the prepared magnesium hydroxide cannot meet the requirements of high-grade magnesium hydroxide flame retardants.
For the study of the hydrothermal process in a strong alkali solution, the precipitation process of the precursor magnesium hydroxide adopts the dropping method, which has problems such as long reaction time and amplification effect.

Method used

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  • Method for preparing low-specific surface area magnesium hydroxide flame retardant by using microchannel reactor
  • Method for preparing low-specific surface area magnesium hydroxide flame retardant by using microchannel reactor
  • Method for preparing low-specific surface area magnesium hydroxide flame retardant by using microchannel reactor

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Embodiment 1

[0030] Prepare 0.5mol / L magnesium chloride solution and 1.0mol / L sodium hydroxide solution, two kinds of raw material liquids are passed into microchannel reactor continuously with advection pump respectively, carry out precipitation reaction in microchannel reactor at room temperature. Wherein the pump speed of magnesium chloride solution and sodium hydroxide solution is controlled at 200ml / min and 200ml / min respectively. The slurry at the outlet of the microchannel reactor is filtered to obtain a filter cake, and then the 2.0mol / L sodium hydroxide solution and the filter cake are mixed at a volume ratio of 2:1 to make a slurry, and the slurry is passed into a hydrothermal synthesis kettle for hydrothermal synthesis. Thermal reaction, the hydrothermal reaction temperature is 150°C, and the hydrothermal time is 6h. After the hydrothermal reaction, the product is filtered, the filtrate is recovered and recycled, and the filter cake is washed, dried and crushed to obtain an aver...

Embodiment 2

[0032] Prepare 0.5 mol / L magnesium chloride solution and 0.5 mol / L sodium hydroxide solution, respectively pass the two kinds of raw material solutions into the microchannel reactor continuously by advection pump, and carry out precipitation reaction in the microchannel reactor at room temperature. Wherein the pump speed of magnesium chloride solution and sodium hydroxide solution is controlled at 100ml / min and 200ml / min respectively. The slurry at the outlet of the microchannel reactor is filtered to obtain a filter cake, and then the 4.0mol / L sodium hydroxide solution and the filter cake are mixed at a volume ratio of 3:1 to make a slurry, and the slurry is passed into a hydrothermal synthesis kettle for hydrothermal synthesis. Thermal reaction, the hydrothermal reaction temperature is 160°C, and the hydrothermal time is 4h. After the hydrothermal reaction, the product is filtered, the filtrate is recovered and recycled, and the filter cake is washed, dried and crushed to ob...

Embodiment 3

[0034] Prepare 2.0 mol / L magnesium chloride solution and 4.0 mol / L sodium hydroxide solution, respectively pass the two kinds of raw material solutions into the microchannel reactor continuously with advection pump, and carry out precipitation reaction in the microchannel reactor at room temperature. Wherein the pump speed of magnesium chloride solution and sodium hydroxide solution is controlled at 20ml / min and 20ml / min respectively. The slurry at the outlet of the microchannel reactor is filtered to obtain a filter cake, and then the 1.0mol / L sodium hydroxide solution and the filter cake are mixed at a volume ratio of 1:1 to make a slurry, and the slurry is passed into a hydrothermal synthesis kettle for hydrothermal synthesis. Thermal reaction, the hydrothermal reaction temperature is 200°C, and the hydrothermal time is 2h. After the hydrothermal reaction, the product is filtered, the filtrate is recovered and recycled, and the filter cake is washed, dried and crushed to ob...

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Abstract

The invention provides a method for preparing a low-specific surface area magnesium hydroxide flame retardant by using a microchannel reactor. The method comprises the following steps of: continuously introducing a magnesium chloride solution and a sodium hydroxide solution into the microchannel reactor, carrying out a precipitation reaction in the microchannel reactor at the room temperature, filtering the slurry obtained after the reaction to obtain the filter cake, mixing a strong alkali solution with the filter cake to form slurry, feeding the slurry into a hydrothermal synthesis kettle for a hydrothermal reaction, and performing after-treatment on the product of the hydrothermal reaction to obtain the magnesium hydroxide flame retardant. The product obtained by the method provided by the invention has the advantages of small specific surface area, controllable grain size and narrow grain size distribution; and the method is simple in process flow and low in process energy consumption, and can be quickly industrialized.

Description

technical field [0001] The invention belongs to the technical fields of material chemistry and inorganic chemical industry, and relates to a method for preparing a low specific surface area magnesium hydroxide flame retardant by using a microchannel reactor. Background technique [0002] Magnesium hydroxide, as an inorganic and environment-friendly flame retardant, has the advantages of high decomposition temperature, good smoke suppression effect, no toxic gas, and no corrosion itself. It has received more attention in recent years. At home and abroad, researches on the preparation technology of magnesium hydroxide flame retardant and its flame retardant performance in different materials are very active. At the same time, the domestic magnesium hydroxide flame retardant market is also developing rapidly. At present, the average particle size of high-grade magnesium hydroxide flame retardants on the market is mostly 0.5~1.5μm, and the specific surface area is less than 10m ...

Claims

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Application Information

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IPC IPC(8): C01F5/22C09K21/02
Inventor 陈光文任明月李淑莲赵玉潮杨梅刘立平任杰
Owner DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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