Vacuum-drying method and apparatus

Drying and gas or vapor contact with solids – Apparatus – With means to treat gas or vapor

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Details

34 27, 34 73, 34 92, F26B 504

Patent

active

043476716

ABSTRACT:
A method of and an apparatus for the drying of articles, especially foodsfs, biological materials and other substances susceptible to cell damage with overheating, wherein the material is spread in a high-vacuum vessel directly adjacent a cooled condenser and is subjected to a vacuum by a pump capable of developing pressures as low as about 0.1 mbar. The chamber is evacuated until there is a noticeable formation of the condenser whereupon the connection between the pump and the chamber is closed and the product is heated to evaporate liquids but below a predetermined temperature (say a maximum of 50.degree. C.) while the condensate resulting from the evaporation is collected directly below the product and is discharged.

REFERENCES:
patent: 1801687 (1931-04-01), Pelphrey
patent: 2512897 (1950-06-01), David
patent: 3742614 (1973-07-01), Bettermann et al.
patent: 4081914 (1978-04-01), Rautenbach

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