Method for preparing amorphous calcium carbonate by microemulsion method

A technology of amorphous calcium carbonate and microemulsion method, applied in the direction of calcium carbonate/strontium/barium, etc., can solve the problems of amorphous calcium carbonate purity to be improved, poor controllability of the preparation process, etc., and achieve favorable control and expansion of the reaction Reaction time range, high purity effect

Inactive Publication Date: 2009-11-18
HENAN UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

At present, there are many preparation methods for amorphous calcium carbonate, but most of them have poor controllability of the preparation process, and the purity of the prepared amorphous calcium carbonate needs to be improved.

Method used

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  • Method for preparing amorphous calcium carbonate by microemulsion method
  • Method for preparing amorphous calcium carbonate by microemulsion method
  • Method for preparing amorphous calcium carbonate by microemulsion method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] CaCl 2 2H 2 O powder and dimethyl carbonate were placed in a molar ratio of 1:1 containing CaCl 2 2H 2 In a beaker of distilled water with a molar ratio of O of 2778:1, it was dispersed evenly at a stirring speed of 500 rpm to form a microemulsion. will be compared with CaCl 2 2H 2 Na with O molar ratio of 1:1 3 C 6 h 5 o 7 2H 2 Add the O powder to the above liquid and dissolve completely under stirring. will be compared with CaCl 2 2H 2 O NaOH powder with a molar ratio of 2:1 was added to the above mixture, and the stirring was continued for 2 minutes, and the aging time was 3 hours. Finally, the turbid liquid was suction-filtered and dried at 25°C to collect the white product.

[0027] The obtained product was characterized by X-ray diffractometer (XRD), field emission scanning electron microscope (SEM) and field emission transmission electron microscope (TEM). The XRD pattern of the product is shown in figure 1 , it is clearly seen from the spectrum th...

Embodiment 2

[0029] CaCl 2 2H 2 O powder and dimethyl carbonate were placed in a molar ratio of 1:2 containing CaCl 2 2H 2 In a beaker of distilled water with a molar ratio of O of 5556:1, disperse it evenly at a stirring speed of 1000 rpm to form a microemulsion. will be compared with CaCl 2 2H 2 Add sodium aconitate with a molar ratio of 2:1 to the above liquid, and dissolve completely under stirring. will be compared with CaCl 2 2H 2 O NaOH powder with a molar ratio of 2:1 was added to the above mixture, and the stirring was continued for 4 minutes, and the aging time was 6 hours. Finally, the turbid liquid was suction-filtered and dried at 27°C to collect the white product.

[0030] The obtained product was characterized by X-ray diffractometer (XRD), field emission scanning electron microscope (FESEM) and transmission electron microscope (TEM). The XRD pattern of the product is shown in figure 1 , it is clear from the spectrogram that the product is amorphous calcium carbona...

Embodiment 3

[0032] CaCl 2 2H 2 O powder and dimethyl carbonate were placed in a molar ratio of 1:3 containing CaCl 2 2H 2 In a beaker of distilled water with a molar ratio of O of 8334:1, disperse it evenly at a stirring speed of 300 rpm to form a microemulsion. will be compared with CaCl 2 2H 2 Add the sodium trimesisate with a molar ratio of 1:2 to the above liquid, and dissolve completely under stirring. will be compared with CaCl 2 2H 2O NaOH powder with a molar ratio of 2:1 was added to the above mixed solution, stirring was continued for 1 min, and the aging time was 9 h. Finally, the turbid liquid was suction-filtered, dried at 20°C, and the white product was collected.

[0033] The obtained product was characterized by X-ray diffractometer (XRD), field emission scanning electron microscope (FESEM) and transmission electron microscope (TEM). The XRD pattern of the product is shown in figure 1 , it is clearly seen from the spectrum that the product is an amorphous calcium ...

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Abstract

The invention relates to a method for preparing amorphous calcium carbonate by microemulsion method. Calcium chloride and dimethylcarbonate are dissolved in water to prepare microemulsion, then tricarboxylate is added and dissolved in microemulsion, finally amorphous calcium carbonate is produced on the action of sodium hydroxide. The method provided by the invention is much easier, the reaction time range is expanded, the reaction is better to control and convenient to use in industry; moreover, the purity of the produced amorphous calcium carbonate is high.

Description

(1) Technical field [0001] The invention belongs to the field of calcium carbonate materials, in particular to a method for preparing amorphous calcium carbonate by a microemulsion method. (2) Background technology [0002] So far, the research results have shown that there are 6 kinds of calcium carbonate minerals with the same composition but different structures in nature under normal temperature and pressure: amorphous calcium carbonate (Amorphous calcium carbonate, ACC), monohydrate calcium carbonate, hexahydrate calcium carbonate, vaterite , aragonite, calcite. The thermodynamic stability of these 6 kinds of calcium carbonate increases sequentially, and all of them are crystalline except for ACC. Spherulite, aragonite, and calcite are calcium carbonate crystals without water, and calcium carbonate monohydrate and calcium carbonate hexahydrate contain crystal water. crystals. [0003] Amorphous materials occur widely in nature and play an important role in biominerali...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01F11/18
Inventor 祝迎春赵东辉张晟卯吴志申
Owner HENAN UNIVERSITY
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