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Method for preparing silicon dioxide with high specific surface area by using tubular continuous flow method

A technology with high specific surface area and silicon dioxide, applied in the direction of silicon dioxide, silicon oxide, etc., can solve the problems of difficult to break through the specific surface area of ​​silica, low production efficiency, hidden dangers, etc., to achieve uniform concentration of reactants, Full contact, the effect of eliminating mass transfer problems

Active Publication Date: 2018-05-18
合肥星巢环保科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, this technology requires expensive surfactants to disperse sodium silicate solution in supercritical carbon dioxide, and the high-pressure (>90bar) equipment required for the reaction is expensive, energy-consuming, and has potential safety hazards
And the production efficiency is not high
Moreover, the specific surface area of ​​the silica obtained by the above method is difficult to exceed 700m 2 / g

Method used

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  • Method for preparing silicon dioxide with high specific surface area by using tubular continuous flow method
  • Method for preparing silicon dioxide with high specific surface area by using tubular continuous flow method
  • Method for preparing silicon dioxide with high specific surface area by using tubular continuous flow method

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Embodiment 1

[0034] A method for preparing silicon dioxide with a high specific surface area by a tubular continuous flow method, comprising the following steps:

[0035] (1) Prepare ammonium salt solutions and silicon source aqueous solutions of different concentrations, add the silicon source solution into the ammonium salt solution, wherein the silicon concentration in the silicon source solution is 0.2mol / L, and the concentration of the salt solution is 2.0mol / L;

[0036] (2) Regulate reaction system temperature, reaction temperature is at 40 ℃;

[0037](3) regulate the flow rate of carbon dioxide gas and silicon source solution, the flow rate of carbon dioxide gas and silicon source solution is controlled at 20ml / min, 2ml / min respectively, carbon dioxide gas and silicon source liquid are passed through the tee of continuous flow reactor simultaneously, thereby Produce alternating segment flow of gas and liquid, and the liquid part separated by carbon dioxide bubbles is called a liquid...

Embodiment 2

[0041] As a comparison, silica was prepared using the traditional intermittent bubbling method, the specific method is as follows:

[0042] 1. Mix the silicon source solution with the salt solution, the concentration is the same as in Example 1.

[0043] 2. Pass carbon dioxide gas into the above-mentioned solution, and keep stirring, the temperature and the flow rate of carbon dioxide are the same as in Example 1.

[0044] 3. The aftertreatment method is the same as in Example 2.

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Abstract

The invention discloses a method for preparing silicon dioxide with high specific surface area by using a tubular continuous flow method, and develops a novel precipitation method based on a small tube diameter tubular continuous flow method. The method is used for producing the silicon dioxide with high specific surface area, wherein a raw material for producing white carbon black is sodium silicate, silica sol or a mixed solution of sodium silicate and silica sol, and carbon dioxide gas serving as an acidifying agent goes through a gas-liquid alternating section flow formed by the tubular continuous flow method, so that the problem of mass and heat transfer on micro level is solved fundamentally. Therefore, according to the method disclosed by the invention, silicon dioxide with high specific surface area, small particles and stable product quality can be produced continuously.

Description

technical field [0001] The invention relates to the technical field of preparing precipitated silica, in particular to a method for preparing silica with a high specific surface area by a tubular continuous flow method. Background technique [0002] High specific surface area porous silica (industrial name: white carbon black) is a widely used chemical raw material. Its chemical formula can be SiO 2 ·nH 2 O, where the number n depends on the surface hydroxyl content. Silica has the characteristics of high specific surface area, porosity, high temperature resistance, stable chemical properties, and good electrical insulation performance. Its application fields include: rubber, plastics, papermaking, catalyst carriers, coatings, fuels, and food additives. In 2010, my country's silica production capacity was 1 million tons. In 2015, the demand for white carbon black in the world reached 2.1 million tons, with a market value of 2.5 billion US dollars. [0003] At present, t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B33/18
CPCC01B33/18C01P2002/72C01P2002/82C01P2006/12C01P2006/14
Inventor 郭震王川王杰玉
Owner 合肥星巢环保科技有限公司
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