Process for the preparation of organochlorosilanes
AssigneeWacker Chemie AG
InventorsWilfried Kalchauer, Herbert Straussberger, Willibald Streckel, Jochen Gross
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Abstract
The invention relates to a continuous process for the direct synthesis of methylchlorosilanes by reacting chloromethane with a catalyst composition comprising silicon, zinc promoter and copper catalyst which is selected from a) copper oxide, b) mixtures of at least 80% by weight of copper oxide and copper(I) chloride, c) copper(I) chloride and d) mixtures of at least 80% by weight of copper(I) chloride and copper oxide, where copper catalysts a), b), c) or d) are employed alternately in such a way that copper catalyst a) or b) is followed by c) or d), or copper catalyst c) or d) is followed by copper catalyst a) or b).
Claims7
A continuous process for the direct synthesis of methylchlorosilanes, comprising reacting chloromethane with catalyst compositions comprising silicon, zinc promoter and copper catalyst, said copper catalyst added to the reactor in a sequential manner, said copper catalyst selected from the group consisting of
- a) copper oxide,
- b) mixtures of at least 80% by weight of copper oxide and copper(I) chloride,
- c) copper(I) chloride and
- d) mixtures of at least 80% by weight of copper(I) chloride and copper oxide,
- wherein copper catalysts a), b), c) or d) are employed sequentially in such a way that copper catalyst a) or b) is followed by c) or d), or copper catalyst c) or d) is followed by copper catalyst a) or b).
A process for extending the production phase of a continuous process for the direct synthesis of methylchlorosilanes by reacting chloromethane with silicon metal containing zinc promoter, copper catalyst, and optionally further promotors, said process comprising alternately adding to the reactor during at least said production phase, a catalyst composition rich in copper oxide relative to copper (I) chloride, and a catalyst composition rich in copper (I) chloride relative to copper oxide.
Dependencies are inferred from the claim text.