Improved filtering medium and use of the said filtering...

Details Improved filtering medium and use of the said filtering... Improved filtering medium and use of the said filtering...

B - Operations, Transporting

01

D

B01D 39/16 (2006.01) B01D 39/20 (2006.01) B01D 53/04 (2006.01) B01J 20/20 (2006.01) B01J 20/28 (2006.01) B01J 20/32 (2006.01) B01J 35/00 (2006.01) C02F 3/28 (2006.01)

Patent

CA 2501814

Filtering medium based on activated carbon which is characterized in that it comprises three superposed layers, respectively an inner layer and two outer layers, the inner layer consisting of 80 to 95% by dry weight of activated carbon, the balance for 100% consisting of organic and/or inorganic chemical fibres, the first outer layer comprisingfrom 45 to 95% by dry weight of organic and/or inorganic chemical fibres, the balance for 100% consisting of activated carbon and/or of a material having a density of less than 0.9, the second outer layer comprising from 5 to 25% by dry weight of activated carbon, the balance for 100% consisting of organic and/or inorganic chemical fibres, and in that the weight of the inner layer is between 40 and 200 g/m2 and the weight of the outer layers is between 10 and 100 g/m2.

La présente invention concerne un milieu filtrant à base de charbon actif qui se caractérise en ce qu'il comprend trois couches superposées qui sont respectivement une couche interne et deux couches externes. La couche interne contient de 80 à 95 % en poids à l'état sec de charbon actif, le reste, jusqu'aux 100 %, étant constitué de fibres chimiques organiques et/ou inorganiques, la première couche externe étant formée de 45 à 95 % en poids à l'état sec de fibres chimiques organiques et/ou inorganiques, le reste, jusqu'aux 100 % étant constitué de charbon actif et/ou d'une matière ayant une densité inférieure à 0,9, la deuxième couche externe étant formée de 5 à 25 % en poids à l'état sec de charbon actif, le reste, jusqu'aux 100 % étant constitué de fibres chimiques organiques et/ou inorganiques. Le milieu filtrant se caractérise également en ce que le poids de la couche interne se situe entre 40 et 200 g/m?2¿ et en ce que le poids des couches externes se situe entre 10 et 100 g/m?2¿.

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