Chemistry of inorganic compounds – Silicon or compound thereof – Binary compound
Patent
1989-01-12
1991-12-24
Chaudhuri, Olik
Chemistry of inorganic compounds
Silicon or compound thereof
Binary compound
423463, 423495, 423499, C01B 3304, C01F 754
Patent
active
050750925
ABSTRACT:
A process for continuously preparing silane and a coproduct by reacting a metal hydride such as NaAlH.sub.4 with a silicon halide such as SiF.sub.4, utilizing, in conducting the reaction, equipment which includes, in series, a primary reactor, a secondary reactor and a separation zone. The metal hydride is reacted in the first reactor with less than a stoichiometric amount of the silicon halide, and the unreacted metal hydride is then passed to the second reactor wherein the remainder of the hydride is reacted in the secondary reactor, in which a stoichiometric excess of the silicon halide is added. The rate of silicon halide or metal hydride addition is governed by a temperature differential feed back from the reaction in the secondary reactor so that overall a stoichiometric or substantially stoichiometric operation is achieved. Techniques are also disclosed for splitting the silicon halide feed between the liquid and vapor phases of the secondary reactor to eliminate the hazard of combustible mixtures, and, with variable speed agitation of the liquid, to control the mass transfer characteristics of the reaction. Also, consistant kinetics result from control of residence time by varying the liquid level in the secondary reactor as related to the halide or hydride mass flow rates. These improvements conserve resources, provides improved coproduct and reduce costs.
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Boone James E.
Bossier, III Joseph A.
Richards Douglas M.
Chaudhuri Olik
Ethyl Corporation
Horton Ken
Pippenger P. M.
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