DRYING AND/OR DRY PROCESS PRESERVATION METHOD USING SEMI-PERMEABLE MEMBRANE

摘要

The invention concerns a method for drying moisture-sensitive substances with a solvent which mainly consists in separating said substances from an ambient atmosphere wherein said solvent is present by hermetically sealing said substances in an envelope having advantageously a wall zone non-adherent to said substances wherein said envelope consists essentially of a polymer membrane selectively permeable to the moisturising solvent vapour except to said solvent in liquid state. The inventive method is also useful for preventive treatment of dry substances against moisture.