Microwave heated vacuum dryer for powders

Details Microwave heated vacuum dryer for powders Microwave heated vacuum dryer for powders

1979-03-09

1980-10-28

Camby, John J.

Drying and gas or vapor contact with solids

Apparatus

Vacuum

13 31EB, 34 4, 219 1055A, 219 1055M, F26B 1330

Patent

active

042298865

ABSTRACT:
A source of microwave energy is introduced into a pressure vessel in which a vacuum is drawn. Powdered materials to be dried are introduced and removed from the vessel by screw conveyors which are long enough so that in combination with the material, they prevent the loss of the vacuum in the vessel. The materials are transported through the vessel as the moisture is removed therefrom at essentially ambient temperatures. A water vapor condenser is also included within the pressure vessel to reduce the vacuum pumping requirements thereof.

REFERENCES:
patent: 2705137 (1955-03-01), Haltmeier
patent: 3007690 (1961-11-01), Koniewiez
patent: 3409447 (1968-11-01), Jeppson
patent: 4045639 (1977-08-01), Meisel

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