Separation of metal chlorides from their suspensions in chlorosilanes
AssigneesDegussa AG, Wacker Chemie AG
InventorsBernd Kohler, Eberhard Schulz, Bernd Vendt
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Abstract
A process for separating metal chlorides from a suspension of metal chlorides in chlorosilanes, in which the suspension is filtered under pressure in the absence of air and moisture forming a filter cake, which is granulated and passed to a dissolution zone where the metal chlorides are dissolved to form an aqueous metal chloride solution. The invention also relates to a filtration and dissolution apparatus for this process, and to an apparatus for introducing the crude reaction gas into a circulated suspension of metal chlorides in chlorosilanes, thus producing a feedstock for the process.
Claims14
A process for separating metal chlorides from chlorosilanes, the process comprising:
- filtering a suspension of metal chloride in liquid chlorosilane under pressure, in a zone which has been made inert by the absence of air and moisture, thereby forming a filter cake;
- breaking up the filter cake in a zone which has been made inert to form a granulated filter cake;
- and
- passing the granulated filter cake to a dissolution zone in which the metal chloride is dissolved to form an aqueous metal chloride solution.
A process for separating metal chlorides from chlorosilanes, the process comprising:
- a step for filtering a suspension of metal chloride in liquid chlorosilane under inert conditions thereby forming a filter cake,
- a step for granulating the filter cake under inert conditions to form a granulated filter cake, and
- a step for dissolving the granulated filter cake in water.
Dependencies are inferred from the claim text.