Fluid bed reactor and process

Details Fluid bed reactor and process Fluid bed reactor and process

1987-08-21

1988-05-31

Beck, Shrive P.

Coating processes

Particles, flakes, or granules coated or encapsulated

Solid encapsulation process utilizing an emulsion or...

118716, 118DIG5, 427215, 4272481, 423349, 423350, B05C 1902, B05D 122

Patent

active

047480521

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
Eversteijn, Philips Res. Repts. 26, 134-144, (1971).
Hsu et al, Eighteenth IEEE Photovoltaic Specialists Conference (1984) pp. 553-557.

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