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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 to produce silicon dioxide powder after washing with sedimentation water. However, due to the large amount of deionized water added, silicon tetrachloride is easy to form Silicic acid sol, the sedimentation process is relatively long, and needs to go through multiple washings, the process is relatively complicated; and the concentration of hydrochloric acid produced is very low, the use value is not high, and the utilization rate of raw materials is low

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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Embodiment 1

[0021] In this embodiment, the method for producing hydrochloric acid co-production silica with ceramic balls as the reaction carrier, the specific steps are as follows:

[0022] (1) if figure 1 As shown, in the reaction vessel 2, ceramic balls 3 with a diameter of about 10mm are piled up, and the quality of the accumulation is 20kg, and the bottom and top of the reaction vessel are respectively provided with inlet and outlet ports 4,1;

[0023] (2) Wet the ceramic balls 3 accumulated in the reaction vessel with water, and the excess water is 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 make it gasify, and pass it into the reaction vessel from the air inlet at the bottom, and react with the adhered water 5 in the contact part between the ceramic balls to form silicon dioxide, and at the same time release Hydrogen chloride gas...

Embodiment 2

[0028] The silicon dioxide production method of the present embodiment is the same as embodiment 1, the difference is as image 3 As shown, the bottom of the reaction vessel is provided with a water vapor inlet 6, and while passing into silicon tetrachloride, water vapor lower than the reaction amount is passed into to ensure that silicon tetrachloride is excessive, and silicon tetrachloride enters the reaction vessel When it reacts with water vapor, with the reaction of silicon tetrachloride and adhering water, all the generated silicon dioxide is attached to the reaction carrier, and then the silicon dioxide is obtained through subsequent treatment, which 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 a total of 0.3 kg of water vapor is introduced to finally obtain 6.5 kg of hydrochloric acid (according to industrial concentrated hydrochl...

Embodiment 3

[0031] In this embodiment, the method for producing hydrochloric acid co-production silica with perlite as a reaction carrier, the specific steps are as follows:

[0032] (1) Pile up 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 macropore structure of the perlite after wetting;

[0034] (3) Take 70kg of silicon tetrachloride, heat it to make it vaporize, and pass it into the reaction vessel from the air inlet at the bottom, react with the water stored in the perlite to form silicon dioxide, and the hydrogen chloride gas released from the reaction vessel The gas outlet on the top was discharged, absorbed by a container with a spray device, and the reaction took 6 hours to obtain 140kg of hydrochloric acid (according to industrial concentrated hydrochloric acid with a concentra...

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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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