Patent ID: 7736614
Filing Date: 2010-06-15
Classification: C01B

Abstract:
1. A process for removing aluminum chloride and other partially soluble metal chlorides from liquid chlorosilanes comprising the steps of: condensing an effluent gas comprising chlorosilanes obtained from a process of producing silicon to form a stream containing gases and an impure solution of liquid chlorosilanes, wherein said impure solution of liquid chlorosilanes contains dissolved and suspended aluminum chlorides and other partially soluble metal chlorides as impurities, providing a process vessel with a liquid containing chamber at the bottom of the process vessel, providing an agitator in the liquid containing chamber, introducing a solid seed material and said stream into the processing vessel, removing the gases in said stream from the process vessel and collecting the solid seed material and the impure solution of liquid chlorosilanes in said stream in the liquid containing chamber, mixing the solid seed material and the impure solution of liquid chlorosilanes in the liquid containing chamber under conditions to allow deposition of aluminum and metal chloride layers on the solid seed material and to form a slurry, transferring the slurry into a solids removal vessel wherein a first stream of high solids content liquid and a second stream of a liquid solution with a reduced solids content are produced; transferring the second stream of liquid solution with reduced solids content to a further process or vessel and transferring the first stream of high solids content liquid into a waste storage vessel or a further processing vessel.