Method for preparing white carbon black by utilizing silicon tetrachloride

A silicon tetrachloride and white carbon black technology, applied in the directions of silicon oxide and silicon dioxide, can solve the problems of high temperature conditions, complex equipment, harsh conditions, etc., and achieve obvious economic value, small equipment investment, and mild conditions. Effect

Inactive Publication Date: 2010-08-11
HENAN UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The main disadvantage of the improved Siemens process is the generation of a large number of by-products, that is, about 10 tons of silicon tetrachloride will be associated with 1 ton of polysilicon produced
Silicon tetrachloride is liquid under normal conditions, with a very low boiling point, easy to vaporize and hydrolyze, highly corrosive and toxic, and difficult to store and transport on a large scale
[0005] At present, there are mainly two methods for converting and treating silicon tetrachloride. One is to convert it into trichlorosilane, which is the raw material for polysilicon production. Very low, less than 30%, and the conditions are harsh, the device is complicated, the investment is large, and the energy consumption is high, so it lacks effective market competitiveness
At present, the method of using silicon tetrachloride to produce white carbon black is mainly the gas phase method, that is, silicon tetrachloride is pyrolyzed in a high-temperature hydrogen-oxygen flame at 1800°C to produce gas phase white carbon black, and the white carbon black obtained by this method has excellent properties , but it requires high temperature conditions, high energy consumption, complicated equipment, high product cost and expensive price

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] Preparation of mixed solvent I: according to the molar ratio of ethanol and water of 1:4, the mixed solvent I was prepared by stirring at room temperature.

[0022] Preparation of mixed solvent II: add 0.1% by mass of surfactant hexadecyltrimethylammonium bromide to mixed solvent I, and stir at room temperature to prepare mixed solvent II.

[0023] At room temperature, keeping a stirring speed of 400 rev / min, a certain amount of silicon tetrachloride was mixed with 2.0g·min -1 Slowly added to 300ml of mixed solvent II, so that the final concentration of silicon tetrachloride was added at 1.0mol l -1 . After adding silicon tetrachloride, reduce the stirring speed to 300 rpm, place the reaction solution on a constant temperature water bath at 60°C, reflux for reaction, and mature for 4 hours. The matured product was centrifuged and settled at a speed of 3000 rpm, and the precipitate was repeatedly washed with mixed solvent I until the pH value was 7, and a wet solid pro...

Embodiment 2

[0025] Preparation of mixed solvent I: According to the molar ratio of n-propanol and water of 4:4, the mixed solvent I was prepared by stirring at room temperature.

[0026] Preparation of mixed solvent II: add 0.01% by mass of surfactant sodium dodecylsulfonate to mixed solvent I, and stir at room temperature to prepare mixed solvent II.

[0027] At room temperature, keeping a stirring speed of 250 rpm, a certain amount of silicon tetrachloride was mixed with 0.5g·min -1 The speed is slowly added to 300ml mixed solvent II, so that the final concentration of silicon tetrachloride added is kept at 0.2mol l -1 . After adding silicon tetrachloride, reduce the stirring speed to 100 rpm, place the reaction solution on a constant temperature water bath at 60° C., reflux for reaction, and mature for 1 hour. The aged product was centrifuged and settled at a speed of 1500 rpm, and the sediment was repeatedly washed with mixed solvent I until the pH value was 6 to obtain a wet solid ...

Embodiment 3

[0029] Preparation of mixed solvent I: according to the molar ratio of ethanol and water of 1:2, the mixed solvent I was prepared by stirring at room temperature.

[0030] Preparation of mixed solvent II: add 0.05% by mass of surfactant hexadecyltrimethylammonium bromide to mixed solvent I, and stir at room temperature to prepare mixed solvent II.

[0031] At room temperature, keeping a stirring speed of 325 rpm, a certain amount of silicon tetrachloride was mixed with 1.25g·min -1 Slowly added to 300ml of mixed solvent II at a speed of When the amount of silicon tetrachloride was added dropwise to half, the modifier hexamethyldisilazane, namely HMDS, was added dropwise, so that the final concentration of HMDS in the mixed solvent II was 0.1mol·1 -1 , the final concentration of silicon tetrachloride in the mixed solvent II is controlled at 0.6mol·1 -1. When the HMDS was added dropwise, the reaction solution was placed in a constant temperature water bath at 60° C., stirred ...

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Abstract

The invention discloses a method for preparing white carbon black by utilizing silicon tetrachloride. The method comprises the following steps: mixing deionized water and low molecular fatty alcohol at the molar ratio of 1:4-4:4, and adding a proper amount of surfactant; slowly adding a certain amount of the silicon tetrachloride at the room temperature; and obtaining the white carbon black through the steps of preparing reaction solution, curing the reaction solution, sedimentation and abstersion, pulpifying and spray drying, wherein the concentration of the silicon tetrachloride is controlled to be 0.2-1.0 mol.1-1, and modifiers such as 0.01-0.1mol.1-1 of Hexamethyl disilazane and the like can be added in the preparation process of the hydrophobic white carbon black. The grain diameter of the prepared white carbon black is 50-350nm and the specific surface area is 100-300m<2>.g-1; and the method has high economic value and the prepared white carbon black has good hydrophobic effect.

Description

technical field [0001] The invention relates to a method for preparing white carbon black, in particular to a method for preparing white carbon black by utilizing silicon tetrachloride. Background technique [0002] White carbon black, also known as hydrated silica, has the molecular formula SiO 2 ·nH 2 O, with a relative density of 2.319-2.653 and a melting point of 1750°C, is a white, non-toxic, amorphous micropowder with the advantages of porous, light weight, high dispersion, high temperature resistance, non-combustibility, chemical stability and good electrical insulation performance. Silica is a multifunctional additive widely used in industries such as silicone rubber, paint, ink, medicine, papermaking, food, cosmetics, and chemical mechanical polishing. However, due to the large surface energy of silica particles, it is easy to agglomerate, and its surface has a large number of active hydroxyl groups, which are hydrophilic, so it is difficult to disperse in the or...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B33/12
Inventor 张军徐波时清亮李军波段永华宋帮才卢伟伟姚开胜
Owner HENAN UNIV OF SCI & TECH
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