Patent ID: 8404206

Claim:
A process for producing polycrystalline silicon product in a reactor comprising a reaction chamber and a distributor for evenly distributing gas into the reaction chamber, the reaction chamber comprising at least one reaction chamber wall, the distributor comprising a plurality of distribution openings which provide fluid communication between at least two sources of gas and the reaction chamber, each distribution opening having a channel portion and a flare-out portion and a throttle portion disposed between the channel portion and flare-out portion, the plurality of distribution openings comprising a plurality of peripheral openings and a plurality of central openings, the process comprising: feeding a carrier gas and a thermally decomposable silicon compound from the sources of gas through the distribution openings of the distributor and into the reaction chamber, wherein the concentration of carrier gas in the gas fed through the peripheral openings exceeds the concentration of carrier gas in the gas fed through the central openings to reduce the amount of silicon which deposits on the reactor wall, the gasses passing through the channel portion, the throttle portion and the flare-out portion of the distribution openings; and contacting silicon particles with the thermally decomposable silicon compound in the reaction chamber to cause silicon to deposit onto the silicon particles and increase in size.