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Selective filtration of cigarette smoke using chitosan derivatives

A technology of chitosan and chitosan resin, which is applied in the direction of e-liquid filter, application, tobacco, etc., can solve problems such as instability of cigarette filter

Inactive Publication Date: 2007-09-26
BROWN & WILLIAMSON HLDG INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, it has been found that while glycine is able to reduce the formaldehyde content of tobacco smoke, it is not stable in the cigarette filter manufacturing process

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment I

[0024] The porous chitosan resin was synthesized according to the phase inversion technique. This was achieved by making a 7% chitosan solution by dissolving approximately 20 grams of chitosan chips (utility grade) in 3.5% acetic acid. When the chitosan addition was complete, the viscosity and degree of gelation of the mixture increased. Further dilution with acetic acid yielded a solution with approximately 3% chitosan flakes. This provides a chitosan solution with a more easily controlled viscosity. The total amount of acetic acid used to dissolve the chitosan fragments was approximately 665 ml. The solution was then filtered to separate any undissolved material. The chitosan solution was then dropped into a precipitation bath of 2M sodium hydroxide to obtain water-swellable gel beads. The gel beads were then filtered and washed to neutral with deionized water having a pH of approximately 7.

[0025] Multiphase crosslinking of the chitosan beads was then achieved by sus...

Embodiment II

[0027] The porous chitosan resin was synthesized according to the phase inversion technique in Example 1. In this example, multiphase crosslinking of the chitosan beads was achieved by suspending the beads in a 2.5% aqueous solution of glyoxal for several hours. After crosslinking, the beads were filtered and washed with warm deionized water to remove any excess glyoxal. The beads were then freeze-dried to obtain porous glyoxal-crosslinked chitosan resin beads.

Embodiment III

[0028] Example III: Preparation of porous chitosan resin according to thermally induced phase separation method. A 4% chitosan solution was prepared by dissolving chitosan powder (Vansen Chemicals; 92% deacetylated) in 3.5% acetic acid. A precipitation bath of sodium hydroxide (2 molar) in 20:80 methanol / water solution was prepared and cooled to 0°C. The chitosan solution was then added dropwise to the precipitation bath with gentle stirring. Chitosan precipitated shortly after the solution was added to the precipitation bath. The precipitation bath with the chitosan precipitate was then allowed to return to room temperature. The resulting beads were filtered and washed with deionized water until the wash water became neutral, with a pH of approximately 7.

[0029]Multiphase crosslinking of the chitosan beads was then achieved by suspending approximately 396 grams of wet beads in approximately 1980 ml of 2.5% aqueous glutaraldehyde for several hours. After crosslinking, th...

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PUM

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Abstract

A smoking article filter having a porous resin with a high surface area to mass ratio comprised of a chitosan derivative. PreferedPreferred embodiments include chitosan cross-linked with glutaraldehyde and chitosan cross-linked with glyoxal. The chitosan derivative provides for the selective filtration of cigarette smoke, particularly for the removal of aldehydes, hydrogen cyanide, heavy metals and carbonyls.

Description

[0001] Cross References to Related Applications [0002] This International Patent Application is a Paris Convention application and claims priority to the now-pending US Patent Application Serial No. 10 / 842,165, filed May 10, 2004. field of invention [0003] The present invention relates to improvements in tobacco smoke filters. More particularly, the present invention relates to a cigarette filter capable of selectively removing undesired components from tobacco smoke. Background of the invention [0004] A wide variety of materials have been proposed in the prior art as tobacco smoke filters. Examples of such filter materials include cotton, paper, cellulose acetate, and certain synthetics. However, many of these filter materials are only effective for the removal of particulates, tar and condensable components in tobacco smoke. The art is replete with a myriad of filtration techniques and materials for remo...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): A24D3/08
CPCA24D3/08
Inventor J·W·小卡拉维T·J·杰克逊
Owner BROWN & WILLIAMSON HLDG INC
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