Method for reducing specific surface area BET (Brunauer Emmet Teller) of white carbon black prepared by using sulfuric acid precipitation method

A sulfuric acid precipitation method and a technology of specific surface area, applied in the direction of silicon oxide, etc., can solve the problem of research, to clarify and other problems, and achieve the effect of simple operation, accurate control and easy realization.

Active Publication Date: 2013-12-25
WUXI HENGCHENG SILICON IND CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0011] At present, although there are many methods for preparing silica by sulfuric acid precipitation, there is no research on various important parameters in the production process of silica to clarify its impact on product performance, especially important properties such as specific surface area BET and oil absorption value DBP. These properties directly determine the application effect of silica products in different fields. Therefore, it is of great significance to study in depth the influence of various important parameters in the production process of silica prepared by sulfuric acid precipitation on product performance, and it is also an urgent need to solve in this field. The problem

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  • Method for reducing specific surface area BET (Brunauer Emmet Teller) of white carbon black prepared by using sulfuric acid precipitation method
  • Method for reducing specific surface area BET (Brunauer Emmet Teller) of white carbon black prepared by using sulfuric acid precipitation method
  • Method for reducing specific surface area BET (Brunauer Emmet Teller) of white carbon black prepared by using sulfuric acid precipitation method

Examples

Experimental program
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Effect test

Embodiment 1

[0062] Example 1 Research on the Effects of Process Parameters on the Specific Surface Area BET and Oil Absorption Value DBP of Silica

[0063] In this experiment, L 16 (4 5 ) Orthogonally studied the influence of the five factors of sodium silicate (water glass) concentration, reaction pH, reaction temperature, sodium chloride concentration and aging pH on the specific surface area BET and oil absorption value DBP of silica, and obtained through data analysis Detailed conclusion.

[0064] The specific experimental process is roughly as follows:

[0065] (1) Prepare 200mL of sodium silicate solution with a certain concentration (sodium silicate concentration in Table 1), pour it into a 500mL three-necked flask, add a certain amount (NaCl concentration in Table 1) of NaCl solid; dilute concentrated sulfuric acid to 40% concentration.

[0066] (2) Heat the bottom liquid of the reaction liquid to a certain temperature (the reaction temperature in Table 1), add sulfuric acid d...

Embodiment 2

[0088] Example 2 BET is 117m 2 / g of silica production

[0089] (1) Add solid water glass and water into the dissolving kettle, feed steam with a pressure greater than 0.7Mpa into the dissolving kettle until the pressure in the dissolving kettle is 0.5-0.6Mpa, then turn off the steam, keep warm for 2-3 hours, and dissolve to a mass concentration It is more than 35% liquid water glass;

[0090] (2) adding water to the dissolved liquid water glass in a water glass adjustment tank, and diluting it into a water glass solution with a mass concentration of 22%;

[0091] (3) Mix the water glass solution and sulfuric acid solution in a reaction kettle, and react for 60 minutes at pH 10 and temperature 94°C;

[0092] (4) Adjust the pH of the reaction solution to 6, and age it for 60 minutes at a temperature of 94°C to obtain a slurry;

[0093] (5) Adjust the pH of the slurry to 3; press filter through a filter press, and then wash to filter out part of the water and wash away sodium...

Embodiment 3

[0095] Example 3 BET is 110m 2 / g of silica production

[0096] (1) Add solid water glass and water into the dissolving kettle, feed steam with a pressure greater than 0.7Mpa into the dissolving kettle until the pressure in the dissolving kettle is 0.5-0.6Mpa, then turn off the steam, keep warm for 2-3 hours, and dissolve to a mass concentration It is more than 35% liquid water glass;

[0097] (2) adding water to the dissolved liquid water glass in a water glass adjustment tank, and diluting it into a water glass solution with a mass concentration of 20%;

[0098] (3) Mix the water glass solution and sulfuric acid solution in a reaction kettle, and react for 60 minutes at pH 10 and temperature 94°C;

[0099] (4) Adjust the pH of the reaction solution to 7, and age it for 60 minutes at a temperature of 94°C to obtain a slurry;

[0100] (5) Adjust the pH of the slurry to 3; press filter through a filter press, and then wash to filter out part of the water and wash away sodium...

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Abstract

The invention discloses a method for reducing the specific surface area BET (Brunauer Emmet Teller) of white carbon black prepared by using a sulfuric acid precipitation method. The method comprises the following steps of improving the mass concentration of sodium silicate for reaction, and / or increasing pH value during aging. Specifically, the specific surface area BET of the white carbon black prepared by adopting the sulfuric acid precipitation method can be reduced by improving the mass concentration of the sodium silicate to 20-35 percent and increasing the pH value during aging to 4-10. According to the method, not only can the specific surface area BET of the white carbon black be remarkably reduced, but also accurate control over the specific surface area BET of the white carbon black can be realized, and the requirements on the white carbon black with lower specific surface area in related fields are met. The method disclosed by the invention is simple to operate, easy to implement and suitable for large-scale industrial production.

Description

technical field [0001] The invention relates to the technical field of white carbon black preparation, in particular to a method for reducing the specific surface area BET of white carbon black prepared by a sulfuric acid precipitation method. Background technique [0002] White carbon black is the general term for white powdery X-ray amorphous silicic acid and silicate products, mainly referring to precipitated silica, fumed silica, ultrafine silica gel and aerogel, including powdered Synthesis of aluminum silicate and calcium silicate, etc. Silica is a porous substance whose composition can be SiO 2 ·nH 2 O represents, where nH 2 O exists in the form of surface hydroxyl groups. Silica is soluble in caustic alkali and hydrofluoric acid, insoluble in water, solvents and acids other than hydrofluoric acid, and has high temperature resistance, non-combustibility, tasteless, odorless, and good electrical insulation. As an environmentally friendly additive with excellent pe...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B33/113
Inventor 陈南飞卢爱平
Owner WUXI HENGCHENG SILICON IND CO LTD
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