Freeze drying apparatus

Details Freeze drying apparatus Freeze drying apparatus

1976-01-12

1977-07-05

Camby, John J.

Drying and gas or vapor contact with solids

Apparatus

Vacuum

34 5, F26B 1330, F26B 506

Patent

active

040330486

ABSTRACT:
Freeze drying apparatus in which a liquid product is sprayed into a freezing chamber to produce a frozen powder, which drops on to a multiple stage conveyor in a drying chamber under vacuum. The drying chamber is open to the freezing chamber and is also maintained at freezing temperature. The moisture content of the frozen powder is sublimated by microwave radiation, which does not heat the chamber or the conveyors and causes minimal temperature increase of the powder. The dry powder is carried on a further conveyor, through a microwave excluding choke, to a collection chamber. Cold water vapor is constantly removed from the drying chamber by the vacuum pump and condensed in a heat exchanger, from which the resultant ice is removed by microwave radiation to minimize temperature variations in the system.

REFERENCES:
patent: 2751687 (1956-06-01), Colton
patent: 3020645 (1962-02-01), Copson
patent: 3362835 (1968-01-01), Thuse et al.
patent: 3633283 (1972-01-01), Mishkin et al.
patent: 3740860 (1973-06-01), Smith, Jr.

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