Micro-mesoporous active carbon, and a method of treating it

C - Chemistry – Metallurgy – 01 – B

Patent

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Details

C01B 31/10 (2006.01) B01J 20/20 (2006.01) C01B 31/08 (2006.01) C02F 1/28 (2006.01)

Patent

CA 2439461

An activated carbon that is capable of adsorbing taste-and-odor-causing and other organic compounds, wherein the activated carbon comprises a uniquely modified carbonaceous material. The activated carbon comprising: a pore volume per gram of the activated carbon more than about 0.32 mL in the pore width range between about 4 to 63 angstroms; and a pore volume per gram of the activated carbon more than about 0.21 mL in the pore width range between about 63 to 500 angstroms; provided that the pore volume per gram of the activated carbon in the pore width range of about 20 to 63 angstroms is at least about 25 % of the total pore volume per gram of the activated carbon in the pore width range of 4 to 63 angstroms, as measured per the Argon Adsorption Density Functional Theory protocol; provided that the activated carbon has a pH equal to or greater than 9.9, when immersed as a slurry in nitrogen-purged deionized distilled water, while the slurry contains about 10 % by weight of activated carbon, as measured per the Slurry pH protocol.

L'invention concerne un charbon qui permet d'adsorber des composés donnant un goût et une odeur et d'autres composés organiques, ce charbon actif comprenant un seul matériau carbonacé modifié. Ce charbon actif comprend : (a) une porosité par gramme de charbon actif de plus de 0,32 mL dans la plage de largeurs de pores comprise entre 4 et 63 angströms. Ce charbon comprend aussi (b) une porosité par gramme de charbon actif de plus de 0,21 mL dans la plage de largeurs de pores comprise entre 63 et 500 angströms, à condition que la porosité par gramme de charbon actif dans la plage de 20 à 63 angströms soit au moins égal à 25% de la porosité totale par gramme de charbon actif dans la plage de largeurs comprise entre 4 et 63 angströms, mesurée selon le protocole de la théorie de la fonctionnelle de densité de l'adsorption de l'argon. Toutefois, le charbon actif doit présenter un pH supérieur ou égal à 9,9 lors de son immersion sous forme de bouillie dans une eau distillée désionisée purgé à l'azote, et la bouillie doit contenir environ 10% en poids de charbon actif, mesuré selon le protocole de pH de bouillie.

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