Patent ID: 8557210
Filing Date: 2013-10-15
Classification: C01B

Abstract:
1. An integrated plant process for the production of trichlorosilane, comprising the following steps: A) feeding hydrogen chloride to a fluidized bed reactor ( B) introducing a high boiler fraction containing high boilers, derived from a) the chlorosilane product stream of a plant process for production of trichlorosilane, b) the offgas of polycrystalline silicon production, or c) high boilers from both a) and b), into a saturator together with at least a portion of the hydrogen chloride fed to the fluidized bed reactor ( C) feeding the high boiler- and hydrogen chloride-containing mixture from the saturator in step B) to the fluidized bed reactor ( wherein when the high boiler- and hydrogen chloride-containing mixture contains high boilers from a gaseous chlorosilane product stream from a fluidized bed reactor for preparing trichlorosilane, the gaseous chlorosilane product stream is filtered to remove silicon dust such that the high boiler- and hydrogen chloride-containing mixture is free of silicon dust, and wherein the high boilers have a boiling point at standard pressure greater than the boiling point of silicon tetrachloride, and are composed of silicon, chlorine and optionally hydrogen, oxygen, and carbon.