SELECTIVE FILTRATION OF CIGARETTE SMOKE USING CHITOSAN DERIVATIVES Russian patent published in 2008 - IPC A24D3/00 A24D3/06 

FIELD: food industry.

SUBSTANCE: filtering material for tobacco smoke is developed for smoking products. The material is produced by dissolving chitosan in acetic acid solution with the acid content from approximately 0.1% to approximately 10%. The obtained solution containing chitosan in the amount from approximately 0.1% to approximately 20% is filtered and dripped into precipitating solution containing sodium hydroxide from approximately 1 mole to approximately 5 moles, thus producing gel granules. Then the gel granules are washed and suspended in a cross-linking solution during from approximately 1 hour to approximately 24 hours to produce cross-linked granules. The above cross-linking solution contains from approximately 0.1% to approximately 50% of the cross-linking compound which is glutaraldehyde or glyoxal. The cross-linked granules are washed and dried producing porous granules of cross-linked chitosan polymer. Another version implies that the obtained chitosan solution as stated above containing chitosan in the amount from approximately 0.1% to approximately 20% is cooled down below the standard room temperature in order to be precipitated. The above precipitating solution contains sodium hydroxide, water and methanol. Chitosan solution is dripped to the above precipitating solution producing gel granules. The precipitating solution contains gel granules. The said gel granules are washed and suspended in the cross-linking solution as stated above.

EFFECT: ensuring selective removal of hydrocyanic acid, aldehydes, heavy metals and sulphides from tobacco smoke gaseous phase.

6 cl, 7 ex