Process for drying a material from solution

F - Mech Eng,Light,Heat,Weapons – 26 – B

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F26B 5/06 (2006.01) F26B 19/00 (2006.01)

Patent

CA 2182988

A process for obtaining a solid or semi-solid material by drying a solution thereof which comprises expanding a spray of the solution, which has been supercooled, into a vacuum and collecting the frozen droplets of spray on a surface which is sufficiently cold to cause the frozen solvent to sublime from the frozen droplets at the vacuum pressure, thereby producing particles whose size can be controlled by choice of droplet size. Elevated temperatures or milling stages are not required, so the process is especially suitable for thermolabile materials. The process can be carried out using an apparatus comprising a vacuum chamber (11) having refrigerated walls, a vacuum pump (17) and a condenser (18). The solution is sprayed into the chamber via a nozzle (16) and the frozen droplets are collected on the walls of the chamber (11) and sublimation takes place therefrom.

Procédé de récupération d'une matière solide ou semi-solide par séchage d'une solution de celle-ci. Le procédé consiste à injecter la solution sous forme pulvérisée et surfondue dans un vide, et à capter les gouttelettes gelées de la solution pulvérisée sur une surface suffisamment froide pour provoquer la sublimation du solvant gelé à partir des gouttelettes gelées à la pression vacuométrique, de manière à produire des particules dont on peut réguler les dimensions par sélection des dimensions des gouttelettes. Des températures élevées et des étapes de broyage sont superflues, et, de ce fait, le procédé s'applique très bien aux matières thermolabiles. Ledit procédé peut s'effectuer au moyen d'un appareil comportant une enceinte sous vide (11) à parois réfrigérées, une pompe à vide (17) et un condenseur (18). La solution est pulvérisée dans l'enceinte par l'intermédiaire d'une buse (16), et les gouttelettes gelées s'accumulent sur les parois de l'enceinte (11), d'où se produit la sublimation.

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