Method and apparatus for the preparation of dichlorosilane

摘要

Disclosed are a method and apparatus for the preparation of dichlorosilane by the disproportionation of trichlorosilane at standard pressure and temperatures up to the boiling point of the trichlorosilane in a reactor having a solid-bed catalyst while removing dichlorosilane with contents of trichlorosilane from the gas chamber of the reactor for separation in a distillation column and derivation of liquid reaction phase for the separation of tetrachlorosilane from trichlorosilane in a distillation column with recycling of trichlorosilane into the reactor. Preferably a common distillation column is provided for both separations. The apparatus consists of the solid-bed reactor and the distillation column which is disposed alongside it and in which the receiver for pure tetrachlorosilane, the infeed of liquid reaction phase, the tapping and recycling of trichlorosilane into the reactor, and the input of gaseous dischlorosilane with contents of trichlorosilane are disposed one above the other, and the condenser and the receiver for dichlorosilane are disposed at the top of the column.