Fluid bed reactor and process

Coating processes – Particles – flakes – or granules coated or encapsulated – Solid encapsulation process utilizing an emulsion or...

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

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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.

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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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