Method for removing aluminum from chlorosilanes
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United States of America Patent
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Issued Date -
Mar 4, 2004
app pub date -
May 12, 2003
filing date -
Nov 13, 2000
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Abandoned
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Abstract
The invention relates to a method and a device for separating aluminium from chlorosilanes, in particular for separating aluminium trichloride from silicon tetrachloride or trichlorosilane or from mixtures of silicon tetrachloride or trichlorosilane. According to the invention, aluminium chloride is removed from the chlorosilanes silicon tetrachloride and trichlorosilane in a continuous process, without the addition of admixtures, to obtain a residual content of aluminium that is as low as required, by separating the aluminium trichloride and the chlorosilane by distillation, at a temperature approximately greater than 160.degree. C.
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