Method for producing hydrochloric acid and silicon dioxide by using silicon tetrachloride as raw material

A technology of silicon dioxide and silicon tetrachloride, applied in the direction of silicon dioxide, silicon oxide, chlorine/hydrogen chloride, etc., can solve the problems of low utilization value, high production cost, complicated process, etc., and achieve good promotion and application prospects, The effect of low equipment requirements and simple reaction process

Inactive Publication Date: 2011-06-29
王朝锋
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The gas phase method is to react silicon tetrachloride, hydrogen and air under high temperature conditions to obtain white carbon black and hydrogen chloride gas. This method has problems such as high initial investment, high production energy consumption, high equipment requirements, and high production costs.
The precipitation method is to add silicon tetrachloride to deionized water to generate silicic acid and hydrochloric acid, and then dehydrate t

Method used

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  • Method for producing hydrochloric acid and silicon dioxide by using silicon tetrachloride as raw material
  • Method for producing hydrochloric acid and silicon dioxide by using silicon tetrachloride as raw material
  • Method for producing hydrochloric acid and silicon dioxide by using silicon tetrachloride as raw material

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Example Embodiment

[0020] Example 1

[0021] In this embodiment, the method for producing hydrochloric acid and co-producing silicon dioxide using ceramic balls as the reaction carrier includes the following steps:

[0022] (1) Such as figure 1 As shown, the ceramic balls 3 with a diameter of about 10mm are stacked in the reaction vessel 2, and the mass of the stack is 20kg. The bottom and top of the reaction vessel are respectively provided with inlet and outlet ports 4 and 1;

[0023] (2) Use water to wet the ceramic balls 3 accumulated in the reaction vessel, and the excess water will be discharged from the air inlet at the bottom. figure 2 As shown, there is adhesion water 5 in the contact part between the ceramic balls;

[0024] (3) Take 3kg of silicon tetrachloride, heat it to vaporize and pass it into the reaction vessel from the air inlet at the bottom, and react with the adhering water 5 in the contact part between the ceramic balls to generate silica, which is released at the same time. The ...

Example Embodiment

[0027] Example 2

[0028] The silica production method of this embodiment is the same as that of embodiment 1, the difference lies in image 3 As shown, a water vapor inlet 6 is provided at the bottom of the reaction vessel. While silicon tetrachloride is introduced, water vapor below the reaction amount is introduced to ensure that the silicon tetrachloride is excessive and the silicon tetrachloride enters the reaction vessel. When silicon tetrachloride reacts with water vapor, as silicon tetrachloride reacts with adhering water, all the generated silicon dioxide is finally attached to the reaction carrier, and then through subsequent processing to obtain silicon dioxide, it can improve the reaction of silicon tetrachloride Speed, improve the production efficiency of hydrochloric acid and silica.

[0029] The reaction time of this embodiment is 1 hour, and 0.3 kg of water vapor is injected in total, and finally 6.5 kg of hydrochloric acid (calculated as industrial concentrated hy...

Example Embodiment

[0030] Example 3

[0031] In this embodiment, the method for producing hydrochloric acid and co-producing silicon dioxide using perlite as the reaction carrier includes the following steps:

[0032] (1) Stack 10kg of perlite with an average particle size of 3-5mm in the reaction vessel;

[0033] (2) Wet the perlite accumulated in the reaction vessel with water, and the excess water is discharged from the air inlet at the bottom, and water is stored in the macroporous structure of the perlite after wetting;

[0034] (3) Take 70kg of silicon tetrachloride, heat it to vaporize and pass it into the reaction vessel from the air inlet at the bottom, and react with the water stored in the perlite to generate silica, and at the same time, the released hydrogen chloride is discharged from the reaction vessel The air outlet at the top was discharged and absorbed by a container with a spray device. After 6 hours of reaction, 140kg of hydrochloric acid was obtained (calculated as industrial conc...

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Abstract

The invention discloses a method for producing hydrochloric acid and silicon dioxide by using silicon tetrachloride as a raw material. The gasified silicon tetrachloride is introduced into a reaction container filled with a water wetted reaction carrier to perform absorption reaction, wherein the reaction carrier is a rigid object with at least one smooth continuous convex curved surface; and the silicon tetrachloride is reacted with water on the surface mutually contacted with the reaction container to generate the silicon dioxide and simultaneously release hydrogen chloride for preparing the hydrochloric acid. The production method is simple in reaction process, high in production efficiency, low in energy consumption, low in equipment requirement and simple in operation, and is suitable for industrialized production; and because the silicon dioxide is produced when the hydrochloric acid is produced, the additional value of the method is improved, high economic benefit is generated, and the method has good popularization and application prospect.

Description

technical field [0001] The invention relates to a method for producing hydrochloric acid and co-producing silicon dioxide by using silicon tetrachloride as a raw material, and belongs to the technical field of inorganic chemical industry. Background technique [0002] Silicon tetrachloride is a transparent liquid, volatile and toxic. It is hydrolyzed into silicic acid and hydrogen chloride in humid air, which is corrosive to skin and is a by-product of polysilicon production. At present, the common recovery method for the by-product silicon tetrachloride is to convert it into hydrogen chloride and silicon dioxide. Silicon dioxide has the characteristics of acid resistance, high temperature resistance and stable chemical properties. It is an important inorganic chemical raw material and is mostly used as Reinforcing fillers also have special properties such as good electrical insulation, hygroscopicity and dispersibility, and are widely used in various fields such as rubber, ...

Claims

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Application Information

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IPC IPC(8): C01B7/01C01B33/12
Inventor 王朝锋
Owner 王朝锋
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