Chemistry of inorganic compounds – Silicon or compound thereof – Elemental silicon
Patent
1987-06-11
1989-05-02
Dixon, Jr., William R.
Chemistry of inorganic compounds
Silicon or compound thereof
Elemental silicon
156611, 156612, 156613, 156DIG64, 156DIG98, 422245, 422246, C01B 3302
Patent
active
048266680
ABSTRACT:
The present invention is directed to an improved process for producing ultra high purity polycrystalline silicon which process provides for increased production capacity and electrical power efficiency. The process comprises recycling the exhaust gases of the silane pyrolysis reactor after the gases have been preferably first cooled and filtered utilizing a pocket-type reaction zone enclosure having a particular effective radius thereby effectively decreasing the amount of silicon powder formation. Preferably, the rate of recycle flow is sufficient to entrain silicon powder in the reactor and remove the powder from the reactor with the exiting exhaust gases.
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Breneman William C.
Flagella Robert N.
Gaston Jon M.
Hagan David W.
Dixon Jr. William R.
Griffis Andrew
Reinisch Morris N.
Union Carbide Corporation
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