Filter with integrated adsorbent

A - Human Necessities – 47 – J

Patent

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A47J 31/06 (2006.01) A23F 3/38 (2006.01) A23F 5/22 (2006.01) B01J 20/12 (2006.01) B01J 20/28 (2006.01)

Patent

CA 2219836

An absorbent filter for removing caffeine from liquids. The filter is composed of a matrix of fibrous material; and adsorbent particulate material integrated within the matrix of fibrous material, 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 material may be clay minerals such as, for example, smectite clay minerals. Examples of smectite clay minerals include, bentonite clays and montmorillonite clays. 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 absorbant pour enlever la caféine d'un liquide. Le filtre est constitué d'une matrice de matériau fibreux. Un matériau particulaire absorbant est intégré à la matrice de matériau fibreux. Le passage d'un liquide ayant une concentration en caféine allant d'environ 20 à environ 100 mg par 100 ml de liquide à travers la matrice, avec un temps de contact inférieur à 2 minutes environ, provoque une diminution de la concentration en caféine dans le liquide d'au moins 40 pourcent. La matrice de matériau fibreux peut être choisie parmi les matériaux tissés, tricotés ou non tissés. Le matériau absorbant peut être une argile minérale comme par exemple une argile minérale du type smectite. Comme exemples d'argiles minérales du type smectite, on peut citer les bentonites et les montmorillonites. D'une manière générale, le filtre peut être conçu pour assurer une réduction d'au moins 40 pourcent de la concentration en caféine dans un nombre de tasses de liquide allant d'environ une à environ quarante.

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