Cigarette filter material comprising compounds of iron in high o

Tobacco – Cigar or cigarette making – Including cooperating surfaces to induce rolling

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423236, 423245, 423367, 55387, 55389, A24D 316, B01D 5304, B01D 5928, C01C 312

Patent

active

042469104

ABSTRACT:
Inert gas-permeable granular support materials impregnated with alkali ferrates wherein the ferrates are iron compounds having an oxidation state of +4, +5, or +6 are disclosed. When they are used as a granular filter material in combination with a tobacco product, hydrogen cyanide can be significantly reduced in the smoke obtained from the tobacco product. Activated carbon or alumina impregnated with sodium permanganate and a basic sodium compound may also be combined with the granular filter material.

REFERENCES:
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patent: 3355317 (1967-11-01), Keith et al.
patent: 3434479 (1969-03-01), Till et al.
patent: 3658069 (1972-04-01), Wise
patent: 3669126 (1972-06-01), Soussa et al.
patent: 3889691 (1975-06-01), Urbanic
Hydrocarbon Processing vol. 54, p. 93 "Nonox process removes H.sub.2 S" by Kasai.

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