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Method for preparing large-pore-volume hydrated silica by pH (potential of hydrogen) swing method

A silicon dioxide and hydration technology, applied in the direction of silicon dioxide, silicon oxide, etc., can solve the problems of unreasonable pore volume and dispersion, unsatisfactory performance, complicated preparation methods, etc., and achieve good dispersion and large pore volume , the effect of simple preparation method

Active Publication Date: 2017-09-08
QUECHEN SILICON CHEM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] However, the gas-phase method and the precipitation method mentioned above all have deficiencies. For example, although the performance of the gas-phase method hydrated silica is good, the preparation method is complicated and difficult to operate; although the preparation method of the hydrated silica is simple, the performance is not ideal. For example Pore ​​volume and dispersion are not rational

Method used

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  • Method for preparing large-pore-volume hydrated silica by pH (potential of hydrogen) swing method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] (1) Add 2L of sodium silicate solution with a mass fraction of 7% and 40g of sodium citrate to the reaction kettle and stir evenly, oil bath to 80℃;

[0020] (2) Adjust the pH to 9-10 with ammonia water and stabilize for 20 minutes;

[0021] (3) Add a 5% sulfuric acid solution with a mass fraction of 0.5L / hour until the pH value is 3-4 and stabilize for 10 minutes;

[0022] (4) Repeat the above steps (2) and (3) three times;

[0023] (5) Wash and dry the precipitate to obtain hydrated silica.

Embodiment 2

[0025] (1) Add 2L of 10% sodium silicate solution and 60g of sodium toluene sulfonate into the reaction kettle and stir evenly, oil bath to 90℃;

[0026] (2) Adjust the pH to 9-10 with ammonia water and stabilize for 20 minutes;

[0027] (3) Add a 10% sulfuric acid solution with a mass fraction of 10% at a rate of 0.8L / hour to a pH of 3-4, and stabilize for 10 minutes;

[0028] (4) Repeat the above steps (2) and (3) three times;

[0029] (5) Wash and dry the precipitate to obtain hydrated silica.

Embodiment 3

[0031] (1) Add 2L of 8% sodium silicate solution and 50g of sodium toluene sulfonate into the reaction kettle and stir evenly, oil bath to 80℃;

[0032] (2) Adjust the pH to 9-10 with ammonia water and stabilize for 20 minutes;

[0033] (3) Add 8% sulfuric acid solution at a rate of 0.6L / hour to pH 3-4 and stabilize for 10 minutes;

[0034] (4) Repeat the above steps (2) and (3) three times;

[0035] (5) Wash and dry the precipitate to obtain hydrated silica.

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Abstract

The invention discloses a method for preparing large-pore-volume hydrated silica by a pH (potential of hydrogen) swing method. The method is characterized by comprising the following steps of (1) adding 7-10% by mass percentage of sodium silicate solution and a dispersant to a reaction kettle, performing uniform stirring, and performing an oil bath to be 80-90 DEG C, (2) adjusting pH to be 9-10 by ammonia water and performing stabilization for 20min, (3) dropwise adding a sulfuric acid solution until the pH is 3-4 and performing the stabilization for 10min, (4) repeating Steps (2) and (3) for three times, and (5) cleaning and drying a precipitate to obtain hydrated silica. The method for preparing hydrated silica is the pH swing method, and is simple to operate; and prepared hydrated silica has excellent performance such as large pore volume and high dispersity.

Description

Technical field [0001] The invention relates to the field of chemical preparation, in particular to a method for preparing macroporous hydrated silica by a pH swing method. Background technique [0002] Hydrated silica, also known as white carbon black, also known as light silica, the main component is silica, white amorphous powder, light and loose, soluble in caustic alkali and hydrofluoric acid, insoluble in water and solvents And acid (except hydrofluoric acid). High temperature resistant, non-combustible, tasteless, odorless, and has good electrical insulation. [0003] At present, the preparation methods of hydrated silica include gas phase method and precipitation method. The gas phase method uses silicon chloride, silicon tetrachloride or trichloromonomethylsilane as raw materials, and is produced by flame hydrolysis, which is obtained by hydrolysis of high temperature water vapor at 1000°C formed by the combustion of hydrogen and oxygen. The importance of precipitation ...

Claims

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Application Information

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IPC IPC(8): C01B33/12
Inventor 王永庆
Owner QUECHEN SILICON CHEM
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