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Comprehensive utilization method of chlorosilane

A technology of chlorosilane and calcium silicate, which is applied in the direction of silicate, alkaline earth metal silicate, calcium/strontium/barium chloride, etc., can solve the problems of limiting product quality and use, and achieve circular economy and resource utilization. Maximize the use of the effect

Active Publication Date: 2010-09-15
宁夏胜蓝化工环保科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In recent years, the use of ammonia-alkali waste liquid method to produce calcium chloride has become the mainstream, but the alkali metal chloride content in the calcium chloride product produced by the ammonia-alkali waste liquid method is relatively high, especially the content of sodium chloride is as high as 7%, which limits The quality and use of this type of product

Method used

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  • Comprehensive utilization method of chlorosilane
  • Comprehensive utilization method of chlorosilane
  • Comprehensive utilization method of chlorosilane

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] Chlorosilane is obtained from polysilicon factory, the main component is SiCl 4 , also contains a small amount of Si 2 Cl 6 and Si 3 Cl 8 , calcium oxide is used as the calcium raw material. Chlorosilane, calcium oxide, and water vapor are fed into the reactor at the same time, and the feeding rate is 90kg / h, 100kg / h and 95kg / h. The front end of the reactor raises the temperature of the material to 180°C, and the rear section lowers the temperature to 50°C through the internal cooling tube, the reaction pressure is controlled at 0.5MPa, and the reaction residence time is 30min. The reaction product obtains calcium chloride and calcium silicate product through separation, and through testing calcium chloride total alkali metal chloride (in NaCl) 0.5%, total magnesium (in MgCl) 2 meter) 0.2%, alkalinity [as Ca(OH) 2 Total] 0.2%, water insoluble matter 0.2%. The crystal structure of calcium silicate is tested by XRD, and the XRD test results are shown in figure 1 ,...

Embodiment 2

[0027] Chlorosilane is 99.9999% pure SiCl from polysilicon factory 4 , Calcium uses Shuangfei powder (limestone powder). 1760kg of limestone powder is added to the reactor at one time, SiCl 4 And water is passed into the reactor in the form of steam, the total amount of feed material is 900kg and 5000kg, the reaction temperature is controlled at 350°C, the reaction pressure is controlled at about 5MPa, and the reaction residence time is 10min. The reaction product is separated to obtain calcium chloride and calcium silicate. Calcium chloride, total alkali metal chloride (as NaCl) is detected 0.5%, total magnesium (as MgCl 2 meter) 0.5%, alkalinity [as Ca(OH) 2 Total] 0.2%, water insoluble matter 0.1%, calcium silicate product is amorphous structure by XRD test.

Embodiment 3

[0029] Chlorosilane is taken from the top product of the light component rectification tower of the trichlorohydrogen manufacturer, and its composition is SiH 2 Cl 2 70%, SiHCl 3 30% of the calcium used is calcium hydroxide. Chlorosilane, calcium hydroxide and water were continuously added to the reactor to prevent SiH 2 Cl 2 There is a danger of thermal explosion, the reaction temperature is controlled at 30°C, the reaction pressure is controlled at normal pressure, and the reaction residence time is 200min. The reaction product is separated to obtain calcium chloride and calcium silicate. Calcium chloride, total alkali metal chloride (as NaCl) is detected 0.5%, total magnesium (as MgCl 2 meter) 0.1%, alkalinity [as Ca(OH) 2 Total] 0.2%, water insoluble matter 0.1%. Calcium silicate products have an amorphous structure as tested by XRD.

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Abstract

The invention relates to a comprehensive utilization method of chlorosilane, in particular to a method for producing calcium chloride and calcium silicate by using chlorosilane, especially chlorosilane byproducts in the production processes of organic silicon, trichlorosilane and polycrystalline silicon as raw materials. The technical scheme of the invention comprises the following steps: enabling the chlorosilane and calcium-containing materials to be subject to a gas-solid-liquid or solid-liquid reaction in water or water vapor medium at 30-350 DEG C under a pressure condition ranging from normal pressure to 5MPa, and adopting solid-liquid separation to obtain the calcium chloride and the calcium silicate after the completion of the reaction, wherein the chlorosilane is SinHmCl2n+2-m, mis 0, 1, or 2, and n is 1, 2 or 3. The chlorosilane can be safely and effectively treated by the method, the chlorine element in the chlorosilane can be used for producing the calcium chloride, and the silicon element in the chlorosilane can be used for producing the calcium silicate, thereby eliminating the potential environmental hazard of the chlorosilane byproduct of the organic silicon, trichlorosilane and polycrystalline silicon, and simultaneously achieving the purpose of maximizing resources.

Description

technical field [0001] The present invention relates to a method for comprehensive utilization of chlorosilane, more specifically, to a method for producing calcium chloride by using chlorosilane, especially chlorosilane by-produced in the production process of organic silicon, trichlorosilane and polysilicon, as a raw material and calcium silicate methods. Background technique [0002] The production of organosilicon, trichlorosilane and polysilicon all produces a large amount of by-product chlorosilanes, especially with the continuous production of polysilicon devices, followed by SiCl 4 A sharp increase in the number of by-product chlorosilanes that dominate. According to statistics, every ton of polysilicon produced will be SiCl 4 The main chlorosilane is 10-15 tons, and a large amount of by-product chlorosilane has become a bottleneck restricting the development of the polysilicon industry, and it also causes potential harm to the environment. [0003] SiCl is the in...

Claims

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Application Information

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IPC IPC(8): C01F11/24C01B33/24
Inventor 沈俊赵燕
Owner 宁夏胜蓝化工环保科技有限公司