Method for producing silicon tetrachloride

A technology of silicon tetrachloride and silicon dioxide, applied in the direction of silicon halide compounds, halosilanes, etc., can solve problems such as technical troubles, difficult implementation, and difficult opening of gas paths

Inactive Publication Date: 2009-07-01
NORSK HYDRO ASA
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  • Abstract
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Problems solved by technology

The method is technically cumbersome, has many weaknesses, and can only be implemented with difficult

Method used

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Embodiment Construction

[0027] The production method of silicon tetrachloride:

[0028] 1) Shape the following mixture in a press: 120g rice husk ash powder, 30g soot (surface area according to BET: 20m 2 / g) and 12g of metallic silicon dust (particle size <0.8mm), made into a cylinder with a diameter of 5mm and a length of 10mm, and then dried at 200°C.

[0029] The pellets were exposed to a chlorine flow of 280 N1 / h at a temperature of 350° C. in a quartz tube with a diameter of 70 mm. Heating was stopped after the reaction had started. Thereafter the reaction continued exothermically and at 1050° C. in a self-sustaining manner without additional heating.

[0030] The resulting reaction product was condensed with a cooler. Product: 412 g SiCl 4 2 ). No chlorine was found in the exhaust.

[0031] 2) Digest 180g of silicon oxide produced by olivine and HCl aqueous solution (BET surface area 230m 2 / g) and 20 g of metallic ferrosilicon (Si content 90% by weight, Fe content 10% by weight) were c...

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Abstract

The invention concerns a method for the manufacture of silicon tetrachloride by conversion of a mixture of finely divided and/or amorphous silicon dioxide, carbon and an energy donator with chlorine. Energy donators are metallic or silicon alloys such as silicon, ferrosilicon or calcium suicide. The addition of the donors effects a self-sustaining, exothermic reaction on one hand and a significant lowering of the reaction starting temperature on the other hand. As finely divided and/or amorphous silicon dioxide ashes containing silicon dioxide are primarily used. These are produced by the incineration of silicon-containing plant skeletal structures such as rice husks or straw. Other sources include silicas from the digestion of alkaline earth silicates with hydrochloric acid and filtered particulate from the electrochemical manufacture of silicon, as well as naturally occurring products containing silicon dioxide, such as diatomaceous earth kieselguhr).

Description

technical field [0001] The present invention relates to a process for the manufacture of silicon tetrachloride by converting a concentrated mixture of finely divided and / or amorphous silica, carbon and energy donors using chlorine. The task of the present invention is to develop an economical and technically easy to manufacture SiCl 4 Methods. Besides having a low energy requirement, the method should allow the use of renewable raw materials. Background of the invention [0002] Silicon tetrachloride is finding more and more large-scale applications: as a starting point for the manufacture of highly dispersed fumed silica used as a reinforcing filler for silicone polymers, as a thixotropic agent and as a core material for microporous insulating materials. starting products, but also in particular as a starting material for high-purity silicon for optoelectronic and semiconductor technology. In this regard, depending on the deposition technique used, it may be necessary to...

Claims

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Application Information

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IPC IPC(8): C01B33/107
Inventor C·罗森科尔德
Owner NORSK HYDRO ASA
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