Filter materials including functionalized cellulose

Patent metadata

Field	Value
Publication number	US-2016192701-A1
Application number	US-201414915923-A
Country	US
Kind code	A1
Filing date	Sep 5, 2014
Priority date	Sep 6, 2013
Publication date	Jul 7, 2016
Grant date	—

Abstract

Embodiments described herein provide materials and methods for the absorption or filtration of various species and analytes. In some cases, the materials may be used to remove or reduce the amount of a substance in vapor sample (e.g., cigarette smoke).

First claim

What is claimed:

1 . A method for reducing the amount of an aromatic species in a vapor sample, comprising:
contacting a vapor sample containing a first concentration of an aromatic species with a composition comprising a polymeric absorbent material attached to at least one aromatic binding site such that the vapor phase sample has a second concentration of the aromatic species after contact with the composition, wherein the second concentration is less than the first concentration.

2 . A method as in claim 1 , wherein the polymeric absorbent material is in the form of a fiber or a network of fibers.

3 . A method as in any preceding claim, wherein the polymeric absorbent material comprises a polymer material that is attached to a plurality of aromatic binding sites.

4 . A method as in claim 3 , wherein at least some of the plurality of aromatic binding sites are covalently bonded to the polymer material.

5 . A method as in claim 3 , wherein at least some of the plurality of aromatic binding sites are non-covalently bonded to the polymer material.

6 . A method as in claim 3 , wherein the plurality of aromatic binding sites are dispersed throughout the polymer material.

7 . A method as in any preceding claim, wherein the plurality of aromatic binding sites comprises a mixture of different aromatic binding sites capable of determining a plurality of different aromatic species.

8 . A method as in any preceding claim, wherein the polymeric absorbent material comprises polyvinyl alcohol or polyhydroxyl ethyl methacrylate, either of which is optionally substituted.

9 . A method as in any preceding claim, wherein the polymeric absorbent material comprises an iptycene-based polymer.

10 . A method as in any preceding claim, wherein the polymeric absorbent material comprises a cellulose-based polymer.

11 . A method as in claim 10 , wherein the cellulose-based polymer is substituted cellulose, substituted cellulose acetate, substituted cellulose diacetate, or substituted cellulose triacetate.

12 . A method as in claim 10 or 11 , wherein the cellulose-based polymer is cellulose substituted with at least one aromatic binding site.

13 . A method as in 12 , wherein the aromatic binding site is capable of binding the aromatic species.

14 . A method as in any one of claims 10 - 13 , wherein the cellulose-based polymer comprises the structure,

wherein:
R 1 is a group comprising an aromatic binding site for an aromatic species;
R 2 and R 3 can be the same or different and are hydrogen, alkyl, aryl, a carbonyl group, any of which is optionally substituted; and
n is greater than 1.

15 . A method as in claim 14 , wherein the aromatic binding site comprises a monocyclic aromatic group or a calixarene.

16 . A method as in claim 15 , wherein the calixarene comprises from 4 to 12 aromatic rings.

17 . A method as in claim 14 , wherein the aromatic binding site comprises a hydrogen bond donor.

18 . A method as in claim 14 , wherein the aromatic binding site comprises a hydrogen bond acceptor.

19 . A method as in claim 15 , wherein the aromatic binding site is a phenyl group, optionally substituted.

20 . A method as in claim 15 , wherein the aromatic binding site is a polycyclic aromatic hydrocarbon, optionally substituted.

21 . A method as in any one of claims 10 - 20 , wherein the cellulose-based polymer comprises the structure,

wherein R 4 and R 5 can be the same or different and are hydrogen, alkyl, alkenyl, aryl, heteroalkyl, heteroalkenyl, heteroaryl, or carbonyl group, any of which is optionally substituted.

22 . A method as in any one of claims 10 - 20 , wherein the cellulose-based polymer comprises the structure,

wherein R 6 is alkyl, alkenyl, aryl, heteroalkyl, heteroalkenyl, or heteroaryl, any of which is optionally substituted.

23 . A method as in claim 14 , wherein R 1 has the structure,

24 . A method as in any one of claims 10 - 23 , wherein R 2 and R 3 can be the same or different and are hydrogen, —COCH 3 , or —F 5 Ph.

25 . A method as in claim 24 , wherein R 2 and R 3 are the same.

26 . A method as in claim 24 , wherein R 2 and R 3 are different.

27 . A method as in claim 10 , wherein the cellulose-based polymer has the following structure,

28 . A method as in claim 10 , wherein the cellulose-based polymer has the following structure,

29 . A method as in claim 10 , wherein the cellulose-based polymer has the following structure,

30 . A method as in claim 10 , wherein the cellulose-based polymer has the following structure,

31 . A method as in claim 10 , wherein the cellulose-based polymer has the following structure,

32 . A method as in any preceding claim, wherein the composition is arranged in a filter.

33 . A method as in any preceding claim, wherein the composition is arranged in a smoking article comprising tobacco.

34 . A method as in any preceding claim, wherein the composition is arranged in a cigarette.

35 . A method as in any preceding claim, wherein the aromatic species is benzene, toluene, xylene, or a polycyclic aromatic hydrocarbon.

36 . A method as in claim 35 , wherein the polycyclic aromatic hydrocarbon is benzo[a]pyrene.

37 . A method as in any preceding claim, wherein the vapor sample comprises cigarette smoke.

38 . A filter material, comprising:
a fiber or network of fibers comprising a cellulose-based polymer comprising at least one aromatic binding site.

39 . A filter material as in claim 38 , wherein the cellulose-based polymer is substituted cellulose, substituted cellulose acetate, substituted cellulose diacetate, or substituted cellulose triacetate.

40 . A filter material as in any preceding claim, wherein the cellulose-based polymer is cellulose substituted with at least one aromatic binding site.

41 . A filter material as in any preceding claim, wherein the aromatic binding site is capable of binding an aromatic species.

42 . A filter material as in claim 41 , wherein the aromatic species is in vapor phase.

43 . A filter material as in claim 41 , wherein the aromatic species is benzene

Assignees

• Massachusetts Inst Technology

Inventors

• Swager Timothy M
• Im Jisun

Classifications

• B01J20/3248

  the functional group or the linking, spacer or anchoring group as a whole comprising at least one type of heteroatom selected from a nitrogen, oxygen or sulfur, these atoms not being part of the carrier as such · CPC title

• B01J20/3255

  comprising a cyclic structure containing at least one of the heteroatoms nitrogen, oxygen or sulfur, e.g. heterocyclic or heteroaromatic structures · CPC title

• A24D3/14

  of organic materials as additive (of ion exchange materials A24D3/12) · CPC title

• B01D2258/06

  Polluted air · CPC title

• A24D3/067

  characterised by functional properties · CPC title