Oct 12, 2016
Trichlorosilaneis an important synthesis of organic silicon intermediates, but also the preparationof semiconductor grade polysilicon and solar cell grade polysilicon of the mainraw materials. For a longtime, due to China's smaller production capacity of polysilicon,trichlorosilane is mainly used for organic silicone rubber coupling agent andother silicone materials, the amount of polysilicon is very small.
Hydrogenchloride method: the method is to use metallurgical grade silicon powder as rawmaterial, and hydrogen chloride gas reaction. Is copper oriron-based catalyst, the reaction at 280 ~ 320 ℃ and 0.05 ~3Mpa under:
Hydrogenationof silicon tetrachloride: The reaction is an equilibrium reaction. To improvethe yield of trichlorosilane, it is preferable to carry out the reaction in thepresence of hydrogen chloride. Raw materialsmetallurgical grade products through pre-activation to remove the surfaceoxide, can further improve the yield of trichlorosilane. The reaction is carried out at a temperature of from280 to 320 ° C and from0.05 to 3 MPa: