Process and equipment for the fractional desublimation of solids

Details Process and equipment for the fractional desublimation of solids Process and equipment for the fractional desublimation of solids

1988-08-04

1989-09-19

Spitzer, Robert

Gas separation

Means within gas stream for conducting concentrate to collector

55 82, 55269, 62 12, B01D 702, F25J 500

Patent

active

048677639

ABSTRACT:
Solids are fractionally desublimed in vapor form from a gas/vapor mixture by providing a nozzle through which a gas/vapor mixture containing a solid is accelerated, the nozzle being provided with a concentric opening which allows a cooling gas flowing laterally at a high velocity to impinge upon and mix with the gas/vapor mixture flowing through the nozzle in the mixing zone of the nozzle thereby forming a gas/solid mixture, passing the gas/vapor mixture through the nozzle and the cooling gas through the concentric opening such that the angle at which the cooling gas emerges from the concentric opening into the flow of the gas/vapor mixture to the direction of flow of the gas/vapor mixture ranges from 0.17 pi rad to 0.75 pi rad, the temperature of the resulting gas/solid mixture in the mixing zone being adjusted by the flow rate of the cooling gas in such a way that the temperature is below the sublimation temperature of the desired product solid but above the sublimation temperature of the by-products in the gas/vapor mixture, and allowing the gas/solid mixture to exit the nozzle in the direction of flow of the gas/vapor mixture through the nozzle.

REFERENCES:
patent: 2755887 (1956-07-01), Boatright
patent: 3406012 (1968-10-01), Rahn
patent: 4055397 (1977-10-01), Van Heel
patent: 4080182 (1978-03-01), Vitovec et al.
patent: 4135893 (1979-01-01), Roberts
patent: 4181508 (1980-01-01), Schmid et al.
patent: 4281518 (1981-08-01), Muller et al.
patent: 4528006 (1985-07-01), Vitovec et al.
patent: 4546611 (1985-10-01), Eby et al.
patent: 4725291 (1988-02-01), Ueoka et al.
patent: 4773923 (1988-09-01), Scharf

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