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Method for preparing calcium carbonate of different crystal forms

A technology of calcium carbonate and crystal form, applied in the field of calcium carbonate, can solve problems such as high energy consumption, difficult condition control, and difficult recycling of additives, and achieve the effect of industrialization and easy industrialization

Active Publication Date: 2018-10-12
XIAMEN UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] The purpose of the present invention is to provide a method for preparing different crystalline forms of calcium carbonate by utilizing a carbon dioxide capture and hydrophilic-hydrophobic switchable recyclable additive for the existing methods that often have problems such as difficult condition control, high energy consumption, and difficult recovery of additives. method

Method used

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  • Method for preparing calcium carbonate of different crystal forms
  • Method for preparing calcium carbonate of different crystal forms
  • Method for preparing calcium carbonate of different crystal forms

Examples

Experimental program
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Effect test

Embodiment 1

[0024] Raw materials include: CO 2 (Xiamen Tongan Air Separation Special Gas Plant, purity>98%), calcium chloride (Sinopharm Chemical Reagent Co., Ltd., purity 96%), 1,8-diazacyclo[5,4,0]undecene -7 (DBU, Shanghai Dibo Biotechnology Co., Ltd., purity 99%).

[0025] DBU and water are mixed in a volume ratio of 1:1, stirred and bubbled into carbon dioxide at room temperature for about 60 minutes, and then the solution is mixed with a certain amount of calcium chloride aqueous solution (the total concentration of calcium chloride after mixing is 0.09mol / L) React at 30.0°C for about 10 minutes, centrifuge and wash the solid product generated by the reaction, and dry it in vacuum for characterization. Sodium hydroxide solution was added to the filtrate, the layers were allowed to stand, and the upper oil phase was reused.

[0026] figure 1 The SEM image of the given product; figure 2 The XRD figure of this product is given, and analysis with this figure can know that the fina...

Embodiment 2

[0028] The raw materials and method are the same as in Example 1, except that the total concentration of the calcium chloride aqueous solution is 1.6 mol / L and reacted at 70.0° C. for 10 min. image 3 The electron microscope picture of the product given; Figure 4 An XRD pattern of the product is given, and analysis of the pattern shows that the final product contains 95.0% aragonitic calcium carbonate, and the remainder is calcite calcium carbonate (5.0%).

Embodiment 3

[0030] The raw material different from Example 1 was N,N-dimethylcyclohexylamine (98%, Aladdin Industries).

[0031] N,N-Dimethylcyclohexylamine and water are mixed in a volume ratio of 1:1 with stirring and bubbling carbon dioxide at room temperature for about 60 minutes, and then the solution is mixed with a certain amount of calcium chloride aqueous solution (chlorination The total concentration of calcium after mixing is 1.0mol / L) and react at 40.0°C for about 120min. The solid product generated by the reaction is centrifuged and washed, dried in vacuum, and characterized. Sodium hydroxide solution was added to the filtrate, the layers were allowed to stand, and the upper oil phase was reused.

[0032] Figure 5 The electron microscope picture of the product given; Figure 6 The XRD figure of this product is given, and analysis with this figure can know that the final product contains 98.9% of vaterite calcium carbonate, and the rest is calcite calcium carbonate (1.1%). ...

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Abstract

The invention relates to a method for preparing calcium carbonate of different crystal forms, which relates to the calcium carbonate. The method comprises the following steps: introducing carbon dioxide into an A and water two-phase mixture to generate an aqueous solution of B, wherein A is an organic matter which can react with the carbon dioxide and is not soluble or slightly soluble in water, and B is carbonate or hydrocarbonate of A soluble in water; adding a calcium salt solution into the aqueous solution of B, reacting, preparing calcium carbonate products of different crystal forms, andseparating the solid calcium carbonate product; and converting the aqueous solution after the product is separated into an oil-water two phase, separating an oil phase A, and recycling. A is a carbondioxide trapping agent and also is an adjusting agent for adjusting the different crystal forms of the calcium carbonate products, and A can be easily recycled. The production process is easy in industrialization, and the process is environment-friendly.

Description

technical field [0001] The invention relates to calcium carbonate, in particular to a method for preparing calcium carbonate of different crystalline forms by using an additive that captures carbon dioxide and can be switched between hydrophilic and hydrophobic and changes reaction conditions. Background technique [0002] Calcium carbonate crystals have three crystal forms: calcite, aragonite and vaterite, among which calcite is stable while aragonite and vaterite are unstable. However, vaterite has good dispersion and can have a large specific surface area, so that it can be used as a filling material in plastics, coatings, inks, paper, etc. to improve the physical properties, gloss, fluidity and printing performance of the target product (Leiyun, Journal of Yangtze University, 2014,11,35). The aragonite crystal form generally corresponds to calcium carbonate whiskers. It can be used as a one-dimensional crystal material and has the advantages of high strength, heat resis...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01F11/18
CPCC01F11/183C01P2002/72C01P2004/01C01P2006/80
Inventor 李军穆林达巴比沙·大卫鲁加·贝努瓦苏玉忠洪燕珍王宏涛
Owner XIAMEN UNIV
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