Patent ID: 10207932

Abstract:
There is provided trichlorosilane purification technology in which it is unnecessary to discharge large amounts of chlorosilanes oat of the system in the production of high-purity trichlorosilane from a chlorosilane fraction containing hydrocarbons and in which the reaction control can also be easily performed. In the present invention, the step of converting hydrocarbons contained in a chlorosilane fraction into low-boiling materials by thermal decomposition has been provided in the purification system in order to easily separate the hydrocarbons. Thereby, the conversion of hydrocarbons into low-boiling materials by thermal decomposition and the separation are performed in the trichlorosilane purification cycle, and it is unnecessary to discharge large amounts of chlorosilanes out of the system. As a result, the trichlorosilane production efficiency is increased, and the problem of yield reduction of polycrystalline silicon does not arise either.