High vacuum freeze-drying

Details High vacuum freeze-drying High vacuum freeze-drying

1976-12-28

1978-10-03

Camby, John J.

Drying and gas or vapor contact with solids

Apparatus

With means to treat gas or vapor

F26B 506

Patent

active

041176030

ABSTRACT:
Water-soluble, substantially anhydrous materials such as anhydrous aspirin salt and anhydrous calcium aspirin salt, stable to hydrolysis, are prepared by subjecting a freeze-dried water-soluble material containing molecularly bound water which is susceptible to hydrolysis to a vacuum of 10 microns or less Hg to remove the molecularly bound water and condensing the removed water on a condenser below -50.degree. C.

REFERENCES:
patent: 3234661 (1966-02-01), Nerge
patent: 3620776 (1971-11-01), Mishkin
patent: 3653929 (1972-04-01), Dwyer
patent: 3815251 (1974-06-01), Gelder
patent: 3873745 (1975-03-01), Rey et al.

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