Method for preparing silicon tetrachloride for optical fiber

A silicon tetrachloride and optical fiber technology, applied in the direction of halogenated silicon compounds, etc., can solve the problems of difficult removal, clogging of the reaction device, increase in content, etc., and achieve the effect that the degree of completeness is easier to control

Inactive Publication Date: 2011-06-29
BEIJING GUOJING INFRARED OPTICAL TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, silicon tetrachloride after water treatment makes Si(OH)Cl 3 The content increases, it is not easy to remove in the subsequent purification process, and may cause blockage of the reaction device

Method used

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  • Method for preparing silicon tetrachloride for optical fiber
  • Method for preparing silicon tetrachloride for optical fiber
  • Method for preparing silicon tetrachloride for optical fiber

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] Introduce nitrogen into the system as a protective atmosphere, the material in the tower is heated, the silicon tetrachloride liquid is converted into gas, and condensed by the top condenser. During the period, when the material on the tower column is irradiated by a 4kw mercury lamp, chlorine gas corresponding to the amount of raw material (50L) is introduced into the tower kettle, and after reflux for 5 hours, the material is taken, and the set reflux ratio is 3:1. According to the amount of raw materials, take out the low boiling point and middle distillate according to the corresponding proportion, the taking out speed is 1~3 kg / hour, and keep 1 / 3 of the high boiling point.

[0036] Press the middle distillate into a 3-meter-high, 80-mm-diameter quartz plate rectification tower, pass inert or inert gas into the rectification tower, control the temperature of the tower kettle and tower column between 55 and 70°C, and complete the process after 5 hours After reflux, s...

Embodiment 2

[0038]Introduce argon gas into the system as a protective atmosphere, the material in the tower kettle is heated, the silicon tetrachloride liquid is converted into gas, and condensed by the top condenser, the temperature of the tower kettle is between 55 and 70°C, and the temperature at the top of the tower is between 55 and 70°C between. When the material on the tower column is irradiated by a 2kw mercury lamp, chlorine gas of a corresponding ratio to the raw material amount (30L) is introduced into the tower kettle, and after reflux for 1 hour, the material is taken, and the set reflux ratio is 5:1. According to the amount of raw materials, the low boiling point and intermediate products are taken out in corresponding proportions, the taking out speed is 1-2 kg / hour, and 1 / 4 of the high boiling point is reserved.

[0039] Press the intermediate product into a 3-meter-high, 60-mm-diameter quartz plate rectification tower, pass inert or inert gas into the rectification tower,...

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Abstract

The invention provides a method for preparing silicon tetrachloride for optical fiber. The method comprises the following steps of: introducing chloride under the protective atmosphere of inactive gas or inert gas and under the condition of illumination, so that trichlorosilane is subjected to a photochemical reaction in a rectifying tower, wherein high-boiling-point silicon tetrachloride generated in the production process of polycrystalline silicon serves as a raw material; and controlling the tower kettle temperature and the tower top temperature and taking materials by selecting proper reflux ratio to obtain an intermediate product; further rectifying and purifying the intermediate product to obtain high-purity silicon tetrachloride, wherein infrared transmissivity of hydrogen-containing impurities meets the requirement of the silicon tetrachloride for the optical fiber on impurity transmissivity; and the metal ion content meets the metal content standard of the silicon tetrachloride for the optical fiber. The method has the advantages that: the trichlorosilane with the boiling point close to that of the silicon tetrachloride is removed effectively; the hydrogen-containing impurity content and the metal impurity content of the silicon tetrachloride are reduced; the quality of the silicon tetrachloride purified and prepared by the process completely meets the requirement of optical fiber products; the reaction condition and the completeness are easy to control; other impurities are not introduced; and the method is implemented in an industrial scale and in an effective and economic mode.

Description

technical field [0001] The invention belongs to the technical field of chemical industry, and in particular relates to a production method of silicon tetrachloride for optical fiber. Background technique [0002] Optical fiber communication is a new type of laser communication system developed in the 1970s. It has the advantages of large transmission capacity, high communication quality, strong anti-interference ability, good confidentiality performance, long service life, significant economic benefits, and good social benefits. , is a very promising means of multi-channel communication. It is the basis of the development of information technology and is considered a revolution in the field of communication. Many countries regard the development of optical fiber and cable as the focus of communication technology. [0003] The purity of optical fiber raw materials directly affects the loss characteristics of optical fibers, and is the key to controlling the quality of optica...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B33/08
Inventor 苏小平王铁艳袁琴毛威刘福财莫杰武鑫萍
Owner BEIJING GUOJING INFRARED OPTICAL TECH
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