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US 6,541,650 B2Granted
Process for preparing silanes
AssigneeWacker Chemie AG
InventorsWilli Streckel, Wilfried Kalchauer, Herbert Straussberger
Life of this patent
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Abstract
A process for preparing silanes of the formula 1: RaSiHbCl4-a-b (1) where R is methyl or ethyl, a is 0, 1, 2 or 3 and b is 0 or 1, from hydrogen chloride gas and reactants selected from among a) silicon metal, b) disilanes and oligosilanes whose radicals are selected from among H, R and Cl, and mixtures thereof, wherein the hydrogen chloride gas is prepared from H2 and Cl2 in a concerted process.
Claims19
A concerted process for preparing silanes of the formula 1:
- RaSiHbCl4-a-b (1)
- where
- R is methyl or ethyl,
- a is 0, 1, 2 or 3 and
- b is 0 or 1,
- from hydrogen chloride gas and reactants selected from among (a) silicon metal, (b) disilanes and/or oligosilanes whose radicals are selected from among H, R and Cl, or mixtures thereof, wherein hydrogen chloride gas is prepared by combusting H2 and Cl2 in the concerted process, and wherein said reactants are introduced together with H2 and Cl2 into a reactor, or into a zone of the reactor, whereby said reactants contact hydrogen chloride still hot from combustion of H2 and Cl2 within the reactor.
3 more elements
A concerted process for preparing silanes of the formula 1:
- RaSiHbCl4-a-b (1)
- where
- R is methyl or ethyl,
- a is 0, 1, 2 or 3 and
- b is 0 or 1,
- said process comprising:
- introducing hydrogen and chlorine into a reactor and combusting therein to form hydrogen chloride;
- optionally adding additional, pre-synthesized hydrogen chloride to said reactor to produce a hydrogen chloride composition having a temperature less than the temperature of hydrogen chloride produced by combustion of hydrogen and chlorine;
- contacting said hydrogen chloride or said hydrogen chloride composition with a reactant comprising (a) silicon metal, (b) disilanes and/or oligosilanes, or mixtures thereof;
- and
- recovering a silane of the formula 1.
8 more elements
A concerted process for the preparation of the formula 1:
- RaSiHbCl4-a-b (1)
- where
- R is methyl or ethyl,
- a is 0, 1, 2 or 3 and
- b is 0 or 1,
- from hydrogen chloride gas and reactants selected from among (a) silicon metal, (b) disilanes and/or oligosilanes whose radicals are selected from among H, R and Cl, or mixtures thereof, wherein hydrogen chloride gas is prepared from H2 and Cl2 in the concerted process, and wherein said reactants are introduced together with H2 and Cl2 into a reactor, or into a zone of the reactor, whereby said reactants contact hydrogen chloride still hot from combustion of H2 and Cl2, and wherein the temperature of HCl still hot from the combustion is reduced from the combustion temperature of H2 and Cl2 to a temperature less than said combustion temperature by the addition of preformed HCl into said reactor.
3 more elements
Dependencies are inferred from the claim text.