Silicon dioxide preparation method

A silicon dioxide and carbon dioxide technology, applied in the direction of silicon dioxide, silicon oxide, chemical instruments and methods, etc., can solve the problems of low reaction efficiency and achieve the effect of simple operation and large-scale industrialization

Active Publication Date: 2019-05-31
XIAMEN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the normal pressure carbonization method has been eliminated due to low reaction efficiency; the high pressure carbonization method has not yet been reported for industrial application due to the limitation of high pressure.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] First add 0.07mol diisobutylamine and 0.25mol water into the glass flask, and then pass carbon dioxide into the glass flask to form a homogeneous aqueous solution. A sodium silicate solution with a concentration of 0.75 mol / L was prepared, 20 mL of the sodium silicate solution was mixed with the above aqueous solution, and the reaction was stirred at 70° C. for 20 minutes. The reacted solution is subjected to solid-liquid separation, and the solid silica obtained after separation is properly washed and dried to obtain a white silica powder. The solution obtained by solid-liquid separation was heated to 40°C, allowed to stand still for phase separation, the upper layer of diisobutylamine was recovered, and the lower layer of aqueous solution was evaporated to obtain sodium carbonate.

[0030] The yield of the silicon dioxide product obtained in Example 1 is about 95%. Laser particle size analyzer (LS908) measures the average particle size of the product silica to be 13....

Embodiment 2

[0032] First add 0.04mol tripropylamine, 0.03mol dimethylcyclohexylamine and 0.25mol water into the glass flask, and then pass carbon dioxide into the glass flask to form a homogeneous aqueous solution. A sodium silicate solution with a concentration of 0.75 mol / L was prepared, 20 mL of the sodium silicate solution was mixed with the above aqueous solution, and stirred and reacted at a temperature of 70° C. for 15 minutes. The reacted solution is subjected to solid-liquid separation, and the solid silica obtained after separation is properly washed and dried to obtain a white silica powder. Add 0.35 mol of sodium hydroxide to the solution obtained by solid-liquid separation, then let it stand still to separate the phases, recover the upper layer of tripropylamine and dimethylcyclohexylamine, and evaporate the lower layer of aqueous solution to obtain sodium carbonate.

[0033] The yield of the silicon dioxide product obtained in Example 2 is about 95%. Laser particle size ana...

Embodiment 3

[0035] First add 0.07mol 2,6-dimethylpiperidine and 0.25mol water into the glass flask, and then pass carbon dioxide into the glass flask to form a homogeneous aqueous solution. A sodium silicate solution with a concentration of 0.5 mol / L was prepared, 30 mL of the sodium silicate solution was mixed with the above aqueous solution, and stirred and reacted at a temperature of 70° C. for 15 minutes. The reacted solution is subjected to solid-liquid separation, and the solid silica obtained after separation is properly washed and dried to obtain a white silica powder. The solution obtained by solid-liquid separation was heated to 110°C, allowed to stand still for phase separation, the upper layer 2,6-dimethylpiperidine was recovered, and the lower layer aqueous solution was evaporated to obtain sodium carbonate.

[0036] The yield of the silicon dioxide product obtained in Example 3 is about 92%. Laser particle size analyzer (LS908) measures the average particle size of product ...

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Abstract

The invention discloses a silicon dioxide preparation method which includes the steps: firstly, adding carbon dioxide trapping agents and water into a vessel, and leading carbon dioxide into the vessel to form homogeneous aqueous solution A; secondly, mixing sodium silicate aqueous solution and the aqueous solution A, heating and stirring mixture to perform reaction to obtain reaction liquid; thirdly, heating the reaction liquid acquired in the second step, performing solid-liquid separation, and drying a solid phase to obtain a silicon dioxide product. By the aid of the preparation method, the yield of the silicon dioxide is higher and can reach 95%, sodium carbonate serving as a by-product and the carbon dioxide trapping agents can be recycled, energy is saved, and environments are protected. The method is simple to operate, and large-scale industrialization can be achieved.

Description

technical field [0001] The invention relates to the field of silicon dioxide preparation methods, in particular to the field of silicon dioxide preparation by carbonization. Background technique [0002] Silica is a colorless, odorless, chemically stable solid. It has broad application prospects in optics, catalysis, aerospace industry, medicine, food, polymer materials and other fields. In industry, silicon dioxide is generally produced by hydrolysis reaction with water glass as raw material under the action of acid. For example, sulfuric acid (sulfuric acid method) is commonly used in industry for hydrolysis reaction, and precipitated silica or gel silica can be obtained. The biggest problem with the sulfuric acid process is the large discharge of the by-product sodium sulfate (which leads to soil salinization). In recent years, the carbonization method has attracted widespread attention; the carbonization method uses carbon dioxide instead of other inorganic acids to r...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B33/18C01D7/00
Inventor 李军李明鸿王焱良王宏涛苏玉忠洪燕珍
Owner XIAMEN UNIV
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