Filter with zeolitic adsorbent attached to individual...

A - Human Necessities – 47 – J

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A47J 31/06 (2006.01) A23F 5/22 (2006.01) B01J 20/28 (2006.01)

Patent

CA 2219827

An adsorbent filter for removing cafeine from liquids. The filter is composed of a liquid permeable, electret-treated matrix of fibrous material having individual exposed surfaces; and a relatively uniform distribution of adsorbent zeolite particulate material attached to individual exposed surfaces of the electred-treated fibrous material by substantially non-transient bonding, so that passage of a liquid having a caffeine concentration ranging from about 20 to about 100 mg per 100 mL of liquid through the matrix for a contact time of less than about 2 minutes results in at least a 40 percent reduction in the caffeine concentration of the liquid. The matrix of fibrous material may be selected from woven fabrics, knit fabrics and nonwoven fabrics. Geneally speaking, the filter can be adapted to provide at least a 40 percent reduction in the caffeine concentration for about 1 cup to about 40 cups of a liquid.

L'invention concerne un filtre absorbant pour enlever la caféine d'un liquide. Le filtre est constitué par une matrice d'un matériau fibreux qui a des surfaces individuelles exposées, qui est perméable aux liquides et qui est traitée par un électret. Cette matrice porte également des particules absorbantes de zéolithe réparties d'une manière relativement uniforme en étant fixées par des liaisons sensiblement non transitoires sur les surfaces individuelles exposées du matériau fibreux traité par un électret. Le passage d'un liquide ayant une teneur en caféine allant d'environ 20 à environ 100 mg par 100 ml de liquide à travers la matrice avec une durée de contact inférieure à 2 minutes environ, provoque une diminution de la concentration en caféine dans le liquide d'au moins 40 pour-cent. La matrice de matériau fibreux peut être choisie parmi les matériaux tissés, tricotés et non tissés. D'une manière générale, le filtre peut être conçu pour assurer une réduction d'au moins 40 % de la concentration en caféine dans un nombre de tasses de liquide allant d'environ une à environ quarante.

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