| 摘要 |
A process for the separation of a solvent from a substance in solution or in suspension in this solvent, or containing this solvent, comprising solidifying the solvent and then separating it from the substance by sublimation at reduced pressure in a lyophilisation chamber, in which an atmosphere is created within the chamber consisting essentially of a gaseous medium capable of existing in condensed state at a temperature above -196 DEG C and of having at that temperature a saturated vapour pressure not exceeding 2 torrs, the medium is then condensed on a cooled surface the temperature of which is such that the saturated vapour pressure of the medium does not exceed 2 torrs, and the solvent is then separated from the substance by sublimation and is condensed on the cooled surface. |
