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Processing process of industrial grade silicon tetrachloride

A silicon tetrachloride and treatment process technology, applied in the direction of silicon halide compounds, halosilanes, etc., can solve the problems of pipeline blockage and high solid impurity content, and achieve energy saving, wide application range, and low raw material quality requirements.

Active Publication Date: 2013-03-06
XINTE ENERGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The purpose of the present invention is to solve the problem that pipelines are easily blocked due to the high content of heavy components and solid impurities in crude silicon tetrachloride, and to provide a treatment process suitable for industrial grade silicon tetrachloride from various sources

Method used

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  • Processing process of industrial grade silicon tetrachloride

Examples

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Effect test

Embodiment 1

[0018] 85 (mass)% of crude silicon tetrachloride enters the weight removal tower at a flow rate of 2000kg / h, the temperature of the bottom of the tower is controlled at 75°C, the temperature of the top of the tower is controlled at 65°C, and the reflux ratio is 6:1. The gas phase at the top of the tower The material is transformed into a liquid phase through the condenser, and part of the obtained liquid phase material is returned to the weight removal tower, and part of it is extracted as a primary product and enters the buffer tank at a flow rate of 1700kg / h, and a part of the material in the tower tank is returned to the weight removal tower through a reboiler , the other part is extracted, and the output from the tower kettle is high-boiling viscous substances such as polymers and complexes, as well as solid impurities. The primary product in the buffer tank is pumped into the light removal tower. The temperature of the tower bottom is controlled at 90°C, the temperature of...

Embodiment 2

[0020] 95 (mass)% of crude silicon tetrachloride enters the weight removal tower at a flow rate of 2000kg / h, the temperature of the tower bottom is controlled at 100°C, the temperature of the tower top is controlled at 88°C, the reflux ratio is 20:1, and the gaseous phase material at the top of the tower After being transformed into a liquid phase by the condenser, part of the obtained liquid phase material is refluxed in the weight-removing tower, and part of it is extracted as a primary product and enters the buffer tank at a flow rate of 1700kg / h. The other part is extracted, and the output from the tower kettle is high-boiling viscous substances such as polymers and complexes, as well as solid impurities. The primary product in the buffer tank is then pumped into the light removal tower. The temperature of the tower kettle is controlled at 114°C, the temperature of the tower top is controlled at 85°C, the pressure of the tower top is 0.37MPa, and the reflux ratio is 150:1. ...

Embodiment 3

[0022] 90 (mass)% of crude silicon tetrachloride enters the weight removal tower at a flow rate of 2000kg / h, the temperature of the bottom of the tower is controlled at 120°C, the temperature of the top of the tower is controlled at 100°C, the reflux ratio is 24:1, and the gas phase material at the top of the tower After being transformed into a liquid phase by the condenser, part of the obtained liquid phase material is refluxed in the weight-removing tower, and part of it is extracted as a primary product and enters the buffer tank at a flow rate of 1700kg / h. The other part is extracted, and the output from the tower kettle is high-boiling viscous substances such as polymers and complexes, as well as solid impurities. The primary product in the buffer tank is then pumped into the light removal tower. The temperature of the tower kettle is controlled at 135°C, the temperature of the tower top is controlled at 100°C, the pressure of the tower top is 0.45MPa, and the reflux rati...

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Abstract

The invention belongs to the field of chemical engineering purification and provides a process processing industrial grade silicon tetrachloride into high-purity silicon tetrachloride. The process comprises the following steps: coarse silicon tetrachloride enters a heavy-removing tower, a produced material at the top of the heavy-removing tower serves as a primary product to enter a buffer tank, and produced materials in a tower kettle of the heavy-removing tower are impurities with a high boiling point and solid impurities; the primary product in the buffer tank enters a light-removing tower, a gas phase material at the top of the light-removing tower serves as a heat source to enter a reboiler of the heavy-removing tower and then is cooled through a condenser, and a produced material of the light-removing tower enters a secondary heavy-removing tower by differential pressure; a produced material of the secondary heavy-removing tower flows back to serve as feed of the heavy-removing tower, and a produced material at the top of the secondary heavy-removing tower is a final product. The process can prevent the solid impurities and sticky materials with the high boiling point in a raw material from blocking a feeding pipe of a follow-up rectification tower, is low in requirements for raw material quality and suitable for processing industrial grade silicon tetrachloride of various different sources, and reduces energy consumption by thermal coupling rectification of the heavy-removing tower and the light-removing tower.

Description

technical field [0001] The invention belongs to the field of chemical purification, and in particular relates to a treatment process for obtaining high-purity silicon tetrachloride through rectification of industrial-grade silicon tetrachloride. Background technique [0002] Silicon tetrachloride is a colorless transparent liquid at room temperature with a density of 1.50g / cm 3 , boiling point 57.6°C, easily hydrolyzed into silicic acid and hydrogen chloride when exposed to water, corrosive to the skin, high-purity silicon tetrachloride can be used to make optical fiber preforms and high-purity quartz, and for silicon epitaxy, etc. value product. There are many sources of industrial grade silicon tetrachloride, such as synthetic trichlorosilane (HSiCl 3 ), for example, a large amount of by-products of silicon tetrachloride will be produced in the production of polysilicon, and about 10 tons of silicon tetrachloride will be produced per ton of polysilicon. Therefore, lookin...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B33/107
Inventor 周玲英其他发明人请求不公开姓名
Owner XINTE ENERGY
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