Fluidized bed process

Details Fluidized bed process Fluidized bed process

1988-03-07

1989-09-19

Doll, John

Coating processes

Particles, flakes, or granules coated or encapsulated

Solid encapsulation process utilizing an emulsion or...

118716, 118DIG5, 423349, 423350, 427215, 4272481, C01B 3302, B05D 700, C23C 1600

Patent

active

048680133

ABSTRACT:
Undesirable conversion of a silicon source, such as silane, in the freeboard above a fluidized bed of silicon particles in a fluidized bed reactor, can be reduced by cooling the gas within the freeboard. Preferably, the reduction in temperature is achieved by introducing into the freeboard, a stream of relatively cool quench gas such as hydrogen, which also reduces the concentration of silane in the freeboard. As a result of these two factors, the invention improves the service factor of the fluidized bed apparatus, and reduces the amount of silane conversion to undesired by-products.

REFERENCES:
patent: 3963838 (1976-06-01), Setty et al.
patent: 4154870 (1979-05-01), Wakefield
patent: 4207360 (1980-06-01), Padovani
patent: 4292344 (1981-09-01), McHale
patent: 4416913 (1983-11-01), Ingle et al.
patent: 4642228 (1987-02-01), Sanjurjo et al.
patent: 4748052 (1988-05-01), Allen
Eversteijn, Phillips Res. Repts., 26, 134-144 (1971).
Hsu et al., Eighteenth IEEE Photovoltaic Specialists Conference (1984), pp. 553-557.

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