Patent ID: 9266742
Filing Date: 2016-02-23
CPC Classification: B01D,C01B

Claim Text:
1. A method for producing high-purity trichlorosilane from a mixture comprising methyldichlorosilane (CH 3 HSiCl 2 ), tetrachlorosilane (SiCl 4 ), and trichlorosilane (HSiCl 3 ), said method comprising of: (A) distilling said mixture to obtain a fraction having a higher content of methyldichlorosilane than a methyldichlorosilane content of said mixture before said distilling; (B) heating said fraction having a higher content of methyldichlorosilane to disproportionate chlorine between methyldichlorosilane and tetrachlorosilane to convert methyldichlorosilane into methyltrichlorosilane (CH (C) distilling said disproportionated fraction to separate trichlorosilane, wherein either: (a) said heating is not performed in the presence of a catalyst; (b) said heating comprises heating in a heated vessel with a fluidized bed of silicon comprising copper chloride as a catalyst under a reducing atmosphere comprising hydrogen; or (c) said heating comprises heating to a temperature of from 400 to 600° C.