Tobacco – Smoke separator or treater – By chemical reaction – e.g. – ion-exchange – chelating,...
Patent
1980-11-03
1982-12-14
Millin, V.
Tobacco
Smoke separator or treater
By chemical reaction, e.g., ion-exchange, chelating,...
131342, 131336, A24D 300, A24D 308, A24D 316
Patent
active
043633331
ABSTRACT:
A nitric oxide filtration material or filter, particularly for tobacco smoke, comprises activated carbon, preferably in particulate form, upon which has been absorbed a C-nitroso compound, any substituent group of said compound, other than a nitroso group, being such as to have no critical adverse effect on the integrity of the nitroso group. The compound is preferably an aromatic compound such as nitrosobenzene, 2-nitrosotoluene or 2,4, 6-trimethylnitrosobenzene. Suitably the carbon is coal-based. Advantageously the carbon has been loaded with a metal, such as copper or iron at a loading level in the range of 0.1% to 5% by weight on an untreated carbon basis. The loading level of the C-nitroso compound may be in the range of 2% to 15%, preferably 2% to 7% by weight. Such a filter comprising the C-nitroso compound may advantageously also comprise ventilation means. The invention also comprises a method for the filtration of nitric oxide from a gaseous medium which comprises passing the medium in contact with a filtration material as hereinbefore defined.
REFERENCES:
patent: T901024 (1972-08-01), Sloan et al.
patent: 3251365 (1966-05-01), Keith et al.
patent: 3460543 (1969-08-01), Keith et al.
patent: 4163452 (1979-08-01), Green et al.
British-American Tobacco Company Limited
Millin V.
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