Filter with adsorbent clay minerals 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 2219830

An adsorbent filter for removing caffeine from liquids. The filter is composed of a liquid permeable matrix of fibrous material having individual exposed surfaces; and a distribution of adsorbent clay minerals attached to individual exposed surfaces of the 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. The adsorbent clay minerals include, for example, sodium bentonite clays, calcium bentonite clays, acidified bentonite clays, and modified bentonite clays containing a flocculating agent. Generally 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 adsorbant pour enlever la caféine d'un liquide. Le filtre est constitué par une matrice perméable aux liquides, en matériau fibreux présentant des surfaces individuelles exposées; par des argiles minérales adsorbantes fixées aux surfaces individuelles exposées du matériau fibreux par des liaisons sensiblement non transitoires de sorte que le passage d'un liquide ayant une concentration en caféine 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 pourcent. La matrice en matériau fibreux peut être choisie parmi les matériaux tissés, tricotés ou les non-tissés. Parmi les argiles minérales adsorbantes, on peut citer les argiles du type bentonite sodique, bentonite calcique ou bentonite acide, ainsi que les bentonites modifiées contenant un agent floculant. D'une manière générale, le filtre peut être conçu pour assurer une réduction d'au moins 40 pour-cent de la concentration de caféine dans un nombre de tasses de liquide allant d'environ une à environ quarante.

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