Patent ID: 8529844

Claim:
An apparatus for producing trichlorosilane which decomposes polymer containing high boiling point chlorosilanes generated in a polycrystalline silicon producing process, in a trichlorosilane producing or in a converting process, thereby producing trichlorosilane, the apparatus comprising: a decomposing furnace reacting a hydrogen chloride with the polymer at high temperatures for producing trichlorosilane; a heating unit heating the inside of the decomposing furnace; a raw material supplying tube for guiding the polymer and the hydrogen chloride to the inner bottom portion of the decomposing furnace along the longitudinal direction of the decomposing furnace and supplying to the decomposing furnace through a lower end opening of the raw material supplying tube; a reaction chamber provided between the outer peripheral surface of the raw material supplying tube and the inner peripheral surface of the decomposing furnace; a gas discharge tube for discharging reaction gas from the top of the reaction chamber; and a fin which guides the polymer and the hydrogen chloride supplied from the lower end opening of the raw material supplying tube to be agitated and rise upward and is formed integrally with the outer peripheral surface of the raw material supplying tube that faces a furnace main body of the decomposing furnace, wherein the heating unit includes a heater that surrounds an outer peripheral surface of the furnace main body, and the fin is constituted of plural elements arranged in a longitudinal direction of the raw material supplying tube, where the plural elements are constituted of twisted rectangular plate members that are alternately twisted in a reverse direction.