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Method for rectifying trichlorosilane

A technology of trichlorosilane and trichlorosilane, which is applied in the directions of halogenated silanes and halogenated silicon compounds, etc., achieves the effects of low cost, reduced mist entrainment and large production capacity

Inactive Publication Date: 2011-11-09
河南尚宇新能源股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The technical problems to be solved by the present invention are the four major problems of reducing energy consumption, reducing pollution, improving quality and expanding production capacity that trichlorosilane production currently faces

Method used

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  • Method for rectifying trichlorosilane
  • Method for rectifying trichlorosilane

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] as attached figure 1 As shown, the crude synthetic liquid with a trichlorosilane concentration of about 85% sent from the synthesis section is driven into the upper feed port of the pre-tower 3 by the pre-tower feed pump 1, and the pre-tower is a guided sieve plate tower. The number of trays is 22~26, the pressure at the top of the tower is 60~70KPa, the temperature at the top of the tower is 40~50°C, and the reflux ratio is 0.1~0.3. The reboiler 2 at the lower part of the pre-column uses a jacket to feed 500Kpa saturated steam to indirectly heat the liquid crude trichlorosilane. There are two-stage condensers at the top of the pre-column. The chilled water is 400~500 Kpa, and the tube side of the secondary condenser is fed with frozen brine with a temperature of -25~-30°C and a pressure of 400~500 Kpa. The liquid condensed from the primary condenser 4 enters the reflux tank 6 of the pre-column, and the liquid enters the tower as reflux liquid by utilizing the potentia...

Embodiment 2

[0027] as attached figure 1 As shown, the crude synthetic liquid with a trichlorosilane concentration of about 85% sent from the synthesis section is driven into the upper feed port of the pre-tower 3 by the pre-tower feed pump 1, and the pre-tower is a guided sieve plate tower. The number of trays is 22, the pressure at the top of the tower is 60KPa, the temperature at the top of the tower is 50°C, and the reflux ratio is 0.3. The reboiler 2 at the lower part of the pre-column uses 500Kpa saturated steam to indirectly heat the liquid crude trichlorosilane, and there are two-stage condensers on the top of the pre-column, and the tube side of the first-stage condenser is fed with chilled water at a temperature of 5°C and a pressure of 400 Kpa , the tube side of the secondary condenser is fed with frozen brine with a temperature of -25°C and a pressure of 500 Kpa. The liquid condensed from the primary condenser 4 enters the pre-column reflux tank 6, and the liquid enters the to...

Embodiment 3

[0032] as attached figure 1 As shown, the crude synthetic liquid with a trichlorosilane concentration of about 85% sent from the synthesis section is driven into the upper feed port of the pre-tower 3 by the pre-tower feed pump 1, and the pre-tower is a guided sieve plate tower. The number of trays is 24, the pressure at the top of the tower is 65KPa, the temperature at the top of the tower is 45°C, and the reflux ratio is 0.2. The reboiler 2 at the lower part of the pre-column uses 500Kpa saturated steam to indirectly heat the liquid crude trichlorosilane, and there are two-stage condensers on the top of the pre-column, and the tube side of the first-stage condenser is fed with chilled water at a temperature of 6°C and a pressure of 450 Kpa , the tube side of the secondary condenser is fed with frozen brine with a temperature of -30°C and a pressure of 450 Kpa. The liquid condensed from the primary condenser 4 enters the reflux tank 6 of the pre-column, and the liquid enters...

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Abstract

The invention relates to a method for rectifying trichlorosilane, and belongs to the technical field of trichlorosilane rectification and purification. The method comprises the following steps of: feeding trichlorosilane-containing crude synthesis liquid into a preparation tower and rectifying to separate and remove most light impurity components from a raw material; discharging the liquid subjected to impurity removal by the preparation tower from a tower bottom, and feeding into a trichlorosilane rectifying tower to obtain a trichlorosilane product at a tower top; and feeding the material in a tower kettle into a silicon tetrachloride rectifying tower, and evaporating a silicon tetrachloride product on the top of the silicon tetrachloride rectifying tower. By the method, energy can be saved by 60 percent, and an energy-saving effect is obvious; and by a continuous rectification technology, yield is greatly improved while the energy is saved.

Description

technical field [0001] The invention belongs to the technical field of rectification and purification of trichlorosilane, and in particular relates to a rectification method of trichlorosilane. Background technique [0002] Trichlorosilane is an important raw material for the production of solar-grade and microelectronic-grade polysilicon, and it is also an important intermediate for the synthesis of organic silicon. Polycrystalline silicon is the most important and basic functional material in the semiconductor industry, electronic information industry, and solar photovoltaic cell industry. Silicone is a new type of chemical material with a wide range of applications. In order to promote the sustainable and rapid development of my country's photovoltaic industry and electronic information industry, the National Development and Reform Commission has included "technical development of photovoltaic silicon materials" in the "Guiding Catalog for the Development of Renewable Res...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B33/107
Inventor 杨金星秦永红陈建利赵建桥王国正
Owner 河南尚宇新能源股份有限公司
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