Cryotropic hydrogels and their use as filters

Details Cryotropic hydrogels and their use as filters Cryotropic hydrogels and their use as filters

B - Operations, Transporting

01

D

B01D 39/16 (2006.01) A24D 3/08 (2006.01)

Patent

CA 2758056

There is provided a particle-filter comprising at least one hydrogel formed in aqueous solution at a temperature be-low O C. The filter can arrest particulates of smoke by physisorption on the solid surface of the gel or by chemisorption if the gel is suitably functionalized. The effectiveness of filter in arresting the solid particles and the pressure drop can be controlled by varying the porosity and the pore size distribution of the filter which in turn can be modulated by varying the monomer to water and monomer to cross-linker ratio in the pre-polymer solution. The filter is able to reduce the particle content of the smoke. There is further provided a cigarette comprising at least one particle-filter according as well as a method for the filtration of smoke.

La présente invention concerne un filtre à particules comprenant au moins un hydrogel formé en solution aqueuse à une température inférieure à O °C. Le filtre peut arrêter des particules de fumée par physisorption à la surface solide du gel ou par chimisorption si le gel est fonctionnalisé de façon appropriée. L'efficacité du filtre à arrêter les particules solides et la chute de pression peuvent être contrôlées en faisant varier la porosité et la distribution de la taille des pores du filtre qui peuvent à leur tour être modulées en faisant varier le rapport entre le monomère et l'eau et le rapport entre le monomère et l'agent de réticulation dans la solution de prépolymère. Le filtre peut réduire la teneur en particules de la fumée. L'invention concerne également une cigarette comprenant au moins un filtre à particules selon l'invention ainsi qu'un procédé de filtration de la fumée.

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