Method for preparing nanometer calcium carbonate

A technology of nano-calcium carbonate and nano-particles, applied in the direction of calcium carbonate/strontium/barium, nanotechnology, bulk chemical production, etc., can solve the problems of slow reaction and low efficiency, and achieve the effect of improving reaction rate and convenient selection

Inactive Publication Date: 2012-06-13
XIAMEN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the existing carbonization reaction is still a slow and inefficient process

Method used

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  • Method for preparing nanometer calcium carbonate
  • Method for preparing nanometer calcium carbonate
  • Method for preparing nanometer calcium carbonate

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] Embodiment 1 (anhydrous process)

[0034] Raw materials include: CO 2 (Xiamen Tongan Air Separation Special Gas Plant, purity > 98%), tetraheptyl ammonium bromide [THepAm] [Br] (Shanghai Mairuier Chemical Technology Co., Ltd., purity > 99%), Ca(OH) 2 (Sinopharm Chemical Reagent Co., Ltd., analytically pure, 95%).

[0035] Dry Ca(OH) with a mass ratio of 1:1 2 Mix it with tetraheptylammonium bromide in a mixer, send the mixture into the autoclave, heat the autoclave to 50°C, open the carbon dioxide supply part, make the carbon dioxide pressure 15MPa, and pass it into the autoclave. The reaction was stirred for 5 min and 30 min. The reaction product is released from the high-pressure reaction kettle, washed with the same volume of water, the ionic liquid is washed into the water, and the water is evaporated to recover the ionic liquid. The washed slurry solid is directly heated and dried to obtain the product.

[0036] figure 2 The SEM image of the product reacted ...

Embodiment 2

[0037] Embodiment 2 (anhydrous process)

[0038] Raw materials include: CO 2 (Tongan Air Separation Special Gas Plant, Xiamen City, purity 98%), 1-butyl-3-methylimidazolium chloride [Bmim] [Cl] (Tixiai (Shanghai) Chemical Industry Development Co., Ltd., purity > 98% ). Ca(OH) 2 (Sinopharm Chemical Reagent Co., Ltd., analytically pure, 95%).

[0039] Dry Ca(OH) with a mass ratio of 1:1 2 Mix with 1-butyl-3-methylimidazolium chloride in a mixer, send the mixture into the autoclave, heat the autoclave to 50°C, open the carbon dioxide supply part, make the carbon dioxide pressure 15MPa, and pass it into the autoclave. The reaction was stirred for 5 minutes. The reaction product is released from the high-pressure reaction kettle, washed with the same volume of water, the ionic liquid is washed into the water, and the water is evaporated to recover the ionic liquid. The washed slurry solid is directly heated and dried to obtain the product.

[0040] Figure 4 The SEM picture...

Embodiment 3

[0041] Embodiment 3 (anhydrous process)

[0042] Raw materials include: CO 2 (Xiamen Tongan Air Separation Special Gas Plant, purity 98%), 1-butyl-3-methylimidazole borate [Bmim] [BF 4 ] (Shanghai Chengjie Chemical Co., Ltd., purity > 99%). Ca(OH) 2 (Sinopharm Chemical Reagent Co., Ltd., analytically pure, 95%).

[0043] Dry Ca(OH) with a mass ratio of 1:1 2 Mix with 1-butyl-3-methylimidazolium borate in a mixer, send the mixture into the autoclave, heat the autoclave to 50°C, open the carbon dioxide supply part, make the carbon dioxide pressure 15MPa, and pass it into the autoclave . The reaction was stirred for 5 minutes. The reaction product is released from the high-pressure reaction kettle, washed with the same volume of water, the ionic liquid is washed into the water, and the water is evaporated to recover the ionic liquid. The washed slurry solid is directly heated and dried to obtain the product.

[0044] Calcium carbonate particles are about 100-500nm analyze...

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Abstract

The invention relates to a method for preparing nanometer calcium carbonate and provides a method for preparing the nanometer calcium carbonate, which is capable of performing carbonization reaction with the participation of high-pressure carbon dioxide and ionic liquid under an anhydrous condition. Ca(OH)2, the ionic liquid and the carbon dioxide are added into a high-pressure autoclave to perform the carbonization reaction. A reaction product is separated to obtain a nanometer calcium carbonate product, and the ionic liquid is recovered. The carbonization reaction which the carbon dioxide, especially a supercritical carbon dioxide participates in is performed with the assistance of the ionic liquid, and is characterized in that no water participates in the carbonization reaction. By means of the participation of the ionic liquid, reaction speed can be greatly improved and particle size of the product can be controlled. The ionic liquid can facilitate achievement of cyclic utilization so that the method is a green chemistry chemical production technology. The ionic liquid can be room-temperature ionic liquid or non-room-temperature ionic liquid, thereby facilitating selection of industrialization application.

Description

technical field [0001] The invention relates to a preparation method of nano calcium carbonate, in particular to a method for preparing nano calcium carbonate by performing rapid carbonization reaction under anhydrous conditions with the participation of high-pressure carbon dioxide and ionic liquid. Background technique [0002] Generally, nanoscale calcium carbonate includes ultrafine calcium carbonate (20-100nm) and ultrafine calcium carbonate (<20nm), which are mainly used in rubber industry, plastic industry, ink industry, paint industry, paper industry, pharmaceutical industry, food industry Wait. At present, the main production methods of nano-ultrafine calcium are: intermittent bubbling carbonization method, continuous bubbling carbonization method, continuous spray carbonization method, high gravity reaction crystallization method, etc. In these carbonization reactions, the reaction steps include: CaO or Ca(OH) 2 Dissolved in water, then reacted with CO 2 reac...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01F11/18B82Y40/00
CPCY02P20/54
Inventor 李军易卜拉辛·阿卜杜勒·拉夫洪燕珍苏玉忠王宏涛
Owner XIAMEN UNIV
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