Process for the preparation of silicon tetrachloride
AssigneeWacker Chemie AG
InventorsGunter Kratel, Stefan Loskot
Life of this patent
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Abstract
The invention relates to the preparation of silicon tetrachloride by reacting material containing SiO.sub.2 with chlorine in the presence of carbon and metal halides and especially chlorides of the fifth main or subsidiary group of the Periodic Table at temperatures in the range of from 500.degree. to 1200.degree. C. The material containing SiO.sub.2 has a BET surface area of at least 0.1 m.sup.2 /g and the carbon has a BET surface area of at least 0.5 m.sup.2 /g.
Claims18
In a process for the preparation of silicon tetrachloride of the type including the step of reacting material containing SiO.sub.2 with chlorine in the presence of carbon and catalytic concentrations of a catalyst, the improvement comprising:
- (a) said material containing SiO.sub.2 having a BET surface area of more than 0.1 m.sup.2 /g;
- (b) said carbon having a BET surface area of at least 0.5 m.sup.2 /g;
- (c) said catalyst comprising at least one halide selected from the group consisting of:
- (1) a transition metal halide including iron chloride, iron fluoride, cobalt chloride, cobalt fluoride, nickel chloride, nickel fluoride, chromium chloride, manganese chloride, manganese fluoride, copper chloride, copper fluoride, silver chloride, and silver fluoride, and a combination thereof;
- and
- (2) a chloride of the fifth main or subsidiary group of the Periodic Table;
- and a combination thereof;
- and
- (d) the reaction temperature is in the range from 500.degree. to 1200.degree. C.
Dependencies are inferred from the claim text.