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Method and system for treating silicon tetrachloride by hydrolysis method

A technology of silicon tetrachloride and hydrolysis method, which is applied in the direction of chlorine/hydrogen chloride and chloride preparation, etc., can solve the problems of polluting the ecological environment, high cost, and high energy consumption, and achieve energy saving, equipment simplification, and cost reduction Effect

Active Publication Date: 2013-04-17
北京华宇同方化工科技开发有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Silicon tetrachloride is a highly corrosive poisonous substance that easily reacts with water to form silicon dioxide and hydrogen chloride. Direct discharge will seriously pollute the ecological environment.
In addition, this technology uses a refrigerator to obtain cooling capacity, which consumes a lot of energy and costs, and there is still room for improvement

Method used

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  • Method and system for treating silicon tetrachloride by hydrolysis method
  • Method and system for treating silicon tetrachloride by hydrolysis method
  • Method and system for treating silicon tetrachloride by hydrolysis method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0089] Description of main equipment:

[0090] Reactive distillation tower: bubbling bed reaction section φ800×2000mm; rectification section φ500×5000mm, built with ceramic components;

[0091] Dehydration tower: φ500×6000mm, with ceramic components inside;

[0092] Heat exchange equipment: H-100, made of graphite, heat exchange area 0.6m 2 ;H-101, made of graphite, with a heat transfer area of ​​9.4m 2 ;H-102, made of graphite, heat exchange area 2.0m 2 ;H-103, made of graphite, heat transfer area 0.7m 2 ;H-104, made of graphite, heat exchange area 17.3m 2 ;H-201, made of stainless steel, heat exchange area 5.0m 2 ;H-202, made of stainless steel, heat transfer area 0.1m 2 ;

[0093] Flow Description:

[0094] Such as figure 1 As shown, the hydrochloric acid solution 16 is pumped from the hydrochloric acid storage tank G-102 into the bubbling bed reaction section of the reaction distillation column T-101 through the hydrochloric acid pump P-101, and the silicon tetrac...

Embodiment 2

[0101] Description of main equipment:

[0102] Reactive distillation tower: stirred bubbling bed reaction section φ260×1500mm; rectification section φ100×400mm, built with ceramic components.

[0103] Dehydration tower: φ500×6000mm, with ceramic components inside;

[0104] Heat exchange equipment: H-100, made of graphite, heat exchange area 0.6m 2 ;H-101, made of graphite, with a heat transfer area of ​​9.4m 2 ;H-102, made of graphite, heat exchange area 2.0m 2 ;H-103, made of graphite, heat transfer area 0.7m 2 ;H-104, made of graphite, heat exchange area 17.3m 2 ;H-201, made of stainless steel, heat exchange area 5.0m 2 ;H-202, made of stainless steel, heat transfer area 0.1m 2 ;

[0105] Flow Description:

[0106] Such as figure 2 As shown, the hydrochloric acid solution 15 with a concentration of 35.5% is pumped from the hydrochloric acid storage tank G-102 through the hydrochloric acid pump P-101 into the tower still of the reactive distillation column T-101 wit...

Embodiment 3

[0113] Hydrolysis reaction kettle F-101: φ260×1500mm;

[0114] Analysis tank F-102: φ1000×3500mm;

[0115] Distillation tower T-101: φ100×4000mm;

[0116] Dehydration tower: φ500×6000mm, with ceramic components inside;

[0117] Heat exchange equipment: H-100, made of graphite, heat exchange area 0.6m 2 ;H-101, made of graphite, with a heat transfer area of ​​9.4m2 ;H-102, made of graphite, heat exchange area 2.0m 2 ;H-103, made of graphite, heat transfer area 0.7m 2 ;H-104, made of graphite, heat exchange area 17.3m 2 ;H-201, made of stainless steel, heat exchange area 5.0m 2 ;H-202, made of stainless steel, heat transfer area 0.1m 2 ;

[0118] Flow Description:

[0119] see image 3 ,described as follows:

[0120] The hydrochloric acid solution 2 with a concentration of 25% is pumped into the hydrolysis reactor F-101 with stirring from the hydrochloric acid storage tank G-102 at a mass flow rate of 4900kg / hr through the hydrochloric acid pump P-101, and the silicon ...

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Abstract

The invention provides a method and a system for treating silicon tetrachloride, a by-product of polysilicon production; silicon tetrachloride is converted to anhydrous hydrogen chloride gas by hydrolysis, and white carbon black is generated simultaneously; therefore, the toxic substance of silicon tetrachloride is converted into a product with high value. The anhydrous hydrogen chloride gas can be used for preparing trichlorosilane, a raw material of polysilicon production; therefore, cyclic utilization of the chlorine element in polysilicon production is realized, and the purposes of resource saving and environment friendliness are reached.

Description

technical field [0001] The invention relates to a method and a system for producing anhydrous hydrogen chloride by hydrolyzing silicon tetrachloride, a by-product of polysilicon production, in particular to a method and a system for hydrolyzing and utilizing silicon tetrachloride. Background technique [0002] Polysilicon is the most basic functional material in the semiconductor industry, electronic information industry, and solar photovoltaic cell industry. With the rapid development of these industries, especially the solar photovoltaic industry, the market demand for polysilicon has been greatly stimulated. The polysilicon production method currently used is mainly the Siemens method or the improved Siemens method. Among them, the Siemens method produces a large amount of by-product silicon tetrachloride with very low utilization value. Generally, 8-10 tons of liquid silicon tetrachloride will be produced for every ton of polysilicon produced. Silicon tetrachloride is...

Claims

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Application Information

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IPC IPC(8): C01B7/03
Inventor 张吉瑞
Owner 北京华宇同方化工科技开发有限公司
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