Electrolytic cell with porous membranes to concentrate anions

C - Chemistry – Metallurgy – 02 – F

Patent

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Details

C02F 1/461 (2006.01) C02F 1/467 (2006.01) C02F 1/469 (2006.01) C02F 1/76 (2006.01)

Patent

CA 2323505

The present invention is directed to an apparatus (10) and method for the treatment of water by generating a purifying gas from anions in the water. Preferably, the apparatus (10) and method of the present invention provide for the purification of water by the generation of chlorine at the anode (20) from naturally occurring chloride in the water. The electrolytic cell (10) of the present invention includes a closed electrolytic chamber (12) having a lower inlet opening (14) and an upper outlet opening (16) for directing water to be treated through the chamber. Disposed within the chamber (12) are an anode (20) and a cathode (30) in electrical contact with a conventional direct current power source. Disposed about the anode (20), preferably substantially surrounding the anode (20) and forming the walls of an anode compartment are a plurality of porous membranes (24) disposed so that water must pass sequentially through each membrane before contacting the anode. In the presently preferred embodiment, these porous membranes (24) comprise alternating layers of polypropylene felt and microporous polytetrafluoroethylene film. Most preferably, the cell (10) includes 2-6 sequentially disposed porous membranes (24).

La présente invention concerne un appareil (10) et un procédé de traitement de l'eau au moyen d'un gaz purificateur obtenu à partir des anions présents dans l'eau. L'appareil (10) et le procédé selon l'invention permettent de préférence la purification de l'eau par obtention, au niveau de l'anode (20), de chlore à partir du chlorure présent à l'état naturel dans l'eau. La cellule électrolytique (10) selon la présente invention se compose d'une chambre électrolytique fermée (12) comportant une ouverture d'entrée (14) inférieure et une ouverture de sortie (16) supérieure par lesquelles l'eau traverse la chambre. La chambre (12) renferme une anode (20) et une cathode (30) reliées électriquement à une source de courant continu classique. A proximité de l'anode (20), et de préférence autour de l'anode (20), formant ainsi les parois d'un compartiment anode, se trouve une pluralité de membranes poreuses (24) disposées de sorte que l'eau les traverse séquentiellement avant d'atteindre l'anode. Selon ce mode de réalisation préféré, ces membranes poreuses (24) comprennent des couches alternées de feutre de polypropylène et de film de polytétrafluoroéthylène microporeux. Dans l'idéal, la cellule (10) doit compter de 2 à 6 membranes poreuses (24) disposées séquentiellement.

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