Filters consisting of filter paper or paper-type nonwoven...

Details Filters consisting of filter paper or paper-type nonwoven... Filters consisting of filter paper or paper-type nonwoven...

B - Operations, Transporting

01

D

B01D 39/18 (2006.01) B01J 20/24 (2006.01) B01J 20/28 (2006.01) B01J 41/16 (2006.01) D21H 27/08 (2006.01)

Patent

CA 2375110

The invention relates to filters consisting of filter paper or paper-type nonwoven material. Said filters consist partially or completely of fibrous material containing cellulose. The aim of the invention is to eliminate the disadvantages of the prior art by providing filters which are characterized by an excellent filtering capacity and which are also able to absorb and bind unwanted impurities or accompanying substances in the filter medium. To this end, the cellulose-containing material used for the inventive filter is at least partially carbamided with urea and phosphorylated with phosphoric acid or ammonium phosphate until a nitrogen content in the form of carbamide groups of 1 to 4 % and a phosphorous content of 3 to 8 % is reached. The invention also relates to a suitable method for producing the inventive filters.

Filtres en papier ou en non tissé de type papier, qui sont constitués partiellement ou totalement d'une matière cellulosique fibreuse. Au vu des inconvénients présentés par l'état actuel de la technique, l'objet de la présente invention est la création de filtres se distinguant par une capacité de filtrage élevée, dont la matière qui les constitue est en outre en mesure d'intercepter des substances étrangères ou associées non désirées et de se lier avec lesdites substances. Dans le filtre selon la présente invention, la matière cellulosique est au moins en partie carbamidée avec de l'urée et phosphorylée avec de l'acide phosphorique ou du phosphate d'ammonium, jusqu'à posséder une teneur en azote sous forme de groupes carbamide de 1 à 4 % et une teneur en phosphore de 3 à 8 %. Un procédé de production approprié desdits filtres est également décrit.

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