Method of manufacturing alkylhalosilanes
AssigneeDow Corning Corporation
InventorsRoland L. Halm, Oliver K. Wilding, Jr., Regie H. Zapp
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Abstract
What is disclosed is a method of controlling a process for the preparation of alkylhalosilanes from silicon and alkylhalides where phosphorous or certain phosphorous compounds are used as promoters to enhance selectivity, overall yields of useable silanes and enhanced silicon metal conversion.
Claims28
A method for controlling a process for the manufacture of alkylhalosilanes said process comprising, contacting an alkylhalide with metallurgical grade silicon, at a temperature of 250.degree. C. to 350.degree. C., in the presence of tin or tin compounds, and copper or copper compounds, wherein there is at least also present, 25 to 2500 parts per million based on the silicon in the reacton mass, of a promoter selected from the group consisting essentially of
- (I) elemental phosphorous;
- (II) metal phosphides and,
- (III) compounds capable of forming metal phosphides in the reaction mass of the process.
A composition of matter comprising metallurgical grade silicon;
- copper or copper compounds;
- tin or tin compounds and, phosphorous selected from the group consisting essentially of
- (I) elemental phosphorous;
- (II) metal phosphides and,
- (III) compounds capable of forming metal phosphides.
Dependencies are inferred from the claim text.