Coating processes – Particles – flakes – or granules coated or encapsulated – Inorganic base
Patent
1976-11-29
1978-04-11
Cooper, Jack
Coating processes
Particles, flakes, or granules coated or encapsulated
Inorganic base
427248A, 423342, 423350, 423486, 423648R, C01B 3302
Patent
active
040840247
ABSTRACT:
A process is provided for the low cost, high volume production of polycrystalline high purity silicon by a vapor phase reduction of a halosilane, with hydrogen, the resulting polycrystalline silicon being particularly suited for use in the production of single crystal silicon for the manufacture of semiconductor devices, solar cells, and the like. The process of the invention involves the reaction of metallurgical grade silicon (of a purity of about 98%) with a halogen or hydrogen halide to form a halosilane intermediate; the purification of the halosilane and of hydrogen; the separate pre-heating of the purified halosilane and of the purified hydrogen to a temperature range above the chemical reaction temperature of the halosilane and the hydrogen; injection of the halosilane and the hydrogen into a continuous flow reduction tubular reactor wherein the feed materials are instantaneously mixed in a manner which causes chemical reaction to be initiated followed by nucleation and growth of solid high purity silicon particles as the reaction mass flows through the tubular reactor; introduction of the solid-gas reaction mass stream into a cyclone type separator wherein the high purity silicon particles are collected and separated from the gas stream and ejected from the bottom of pg,2 the separator; emitting the gas stream from the top of the separator and conducting the gas stream to a condenser-scrubber system wherein unreacted hydrogen is separated and then recycled to the hydrogen pre-heater for re-use, unreacted silicon halosilane is separated and recycled to the intermediate pre-heater for re-use, and reaction product hydrogen halide is separated and recycled to the silicon halosilane generator for re-use.
REFERENCES:
patent: 2912311 (1959-11-01), Mason
patent: 3012861 (1961-12-01), Ling
patent: 3016291 (1962-01-01), Anes
patent: 3020128 (1962-02-01), Adcock et al.
patent: 3091517 (1963-05-01), Short et al.
patent: 3963838 (1976-06-01), Setty et al.
Beecher Keith D.
Cooper Jack
J. C. Schumacher Co.
LandOfFree
Process for the production of silicon of high purity does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Process for the production of silicon of high purity, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Process for the production of silicon of high purity will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-990244