Phosphorous removal from tetrachlorosilane

摘要

The present invention relates to a method for the purification of tetrachlorosilane used for the manufacture of electronic grade silicon and, more particularly, to a method for removing trace impurities of phosphorus. The method involves contacting liquid tetrachlorosilane with activated charcoal. The process is effective in reducing the phosphorus levels in the tetrachlorosilane to the parts per trillion range. The process can be run as a continuous or batch process with easy separation of the activated charcoal. containing the phosphorus contaminate from the tetrachlorosilane.