C - Chemistry – Metallurgy – 01 – B
Patent
C - Chemistry, Metallurgy
01
B
23/179
C01B 33/08 (2006.01)
Patent
CA 1072718
ABSTRACT OF THE DISCLOSURE: A process for preparing gaseous mixtures of tri- chlorosilane and tetrachlorosilane, wherein elemental silicon is contacted with hydrogen chloride in a fluidized bed. The process is characterized in that the reaction is carried out at a temperature in the range of from 260 to 600°C and in the presence of an iron compound; the iron compound is present in an amount such that when calculated as iron the iron content is 10 to 43 weight percent based on the weight of the total solids in the fluidized bed. It has been found that if an iron compound is employed in the fluidized bed stream, control of the reaction temperature can be provided to +or -5°C of the desired temperature, in the absence of inert gases. It is considered quite surprising that the iron concentration in the fluidized bed would control the reaction temperature to the extent found, whereby any desired quantity of trichlorosilane and/or tetrachlorosilane can be provided by elemental silicon hydrochlorination.
216980
Josten Walter
Kotzsch Hans-Joachim
Vahlensieck Hans-Joachim
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