Patent ID: 6846473
Filing Date: 2005-01-25
Classification: C01B

Abstract:
1. A process for producing hexachlorodisilane, which comprises: discharging an exhaust gas from a polycrystalline silicon reactor in which a polycrystalline silicon is produced by thermal cracking and hydrogen reduction of trichlorosilane; wherein the exhaust gas comprises hydrogen, monochlorosilane, dichlorosilane, trichlorosilane, tetrachlorosilane, and silicone chloride polymer comprising tetrachlorodisilane, hexachlorodisilane, octachlorotrisilane, and decachlorotetrasilane; cooling the exhaust gas in a condenser; wherein said cooling results in the separation of the hydrogen from a condensate comprising at least one chlorosilane; and subsequently distilling said condensate to obtain a liquid comprising hexachlorodisilane.