Absorbent and/or adsorptive filter media

Patent metadata

Field	Value
Publication number	US-9352267-B2
Application number	US-201213723607-A
Country	US
Kind code	B2
Filing date	Dec 21, 2012
Priority date	Jun 20, 2012
Publication date	May 31, 2016
Grant date	May 31, 2016

Abstract

Filter media suitable for various applications and related components, systems, and methods associated therewith are described. The filter media may include a composite structure having a mixture comprising fibrillated fibers (e.g., lyocell) and functional particles. The filter media may exhibit favorable absorption and/or adsorption characteristics.

First claim

What is claimed is:

1. A filter media comprising fibrillated fibers and functional particles, wherein the fibrillated fibers have a Canadian Standard Freeness level of fibrillation of between about 110 mL and about 800 mL and the functional particles comprise greater than about 25% by weight of the filter media, wherein the functional particles have an average surface area of greater than about 900 m 2 /g.

2. The filter media of claim 1 , wherein the fibrillated fibers have a Canadian Standard Freeness level of fibrillation of between about 110 and about 650.

3. The filter media of claim 1 , wherein the fibrillated fibers have a Canadian Standard Freeness level of fibrillation of between about 150 and about 350.

4. The filter media of claim 1 , wherein the fibrillated fibers comprise between about 4% and about 50% of the filter media.

5. The filter media of claim 4 , wherein the fibrillated fibers comprise between about 5% and about 20% of the filter media.

6. The filter media of claim 1 , wherein the fibrillated fibers comprise regenerated cellulose fibers.

7. The filter media of claim 1 , wherein the functional particles have an average surface area of greater than about 1200 m 2 /g.

8. The filter media of claim 1 , wherein the functional particles comprise between about 50% and about 95% by weight of the filter media.

9. The filter media of claim 1 , wherein the functional particles comprise between about 70% and about 95% by weight of the filter media.

10. The filter media of claim 1 , wherein the functional particles comprise activated carbon.

11. The filter media of claim 1 , further comprising a binder material comprising between about 3% and about 15% by weight of the filter media.

12. The filter media of claim 1 , further comprising non-fibrillated fibers, wherein the non-fibrillated fibers comprise less than about 10% by weight of the filter media.

13. The filter media of claim 1 , further comprising a scrim.

14. The filter media of claim 1 , wherein the filter media exhibits a moisture absorption of greater than about 20% by weight after 3 hours of exposure to a moist environment.

15. The filter media of claim 14 , wherein the filter media exhibits a moisture absorption of between about 20% and about 50% by weight after 3 hours of exposure to the moist environment.

16. The filter media of claim 1 , wherein the filter media exhibits a moisture absorption of greater than about 50% by weight after 24 hours of exposure to a moist environment.

17. The filter media of claim 16 , wherein the filter media exhibits a moisture absorption of between about 50% and about 150% by weight after 24 hours of exposure to the moist environment.

18. The filter media of claim 1 , wherein the filter media exhibits a TMP adsorption of greater than about 30% by weight after 3 hours of exposure to a TMP environment.

19. The filter media of claim 18 , wherein the filter media exhibits a TMP adsorption of between about 30% and about 110% after 3 hours of exposure to the TMP environment.

20. The filter media of claim 1 , wherein the filter media has an air permeability of between about 1.5 cfm/sf and about 30 cfm/sf.

21. The filter media of claim 1 , wherein the filter media has an average surface area of between about 900 m 2 /g and about 2500 m 2 /g.

22. A filter element comprising the filter media of claim 1 .

23. A filter media comprising fibrillated fibers and functional particles, wherein the functional particles comprise greater than about 25% by weight of the filter media and have an average surface area of greater than about 900 m 2 /g, wherein the filter media exhibits a moisture absorption of greater than about 20% by weight after 3 hours of exposure to a moist environment.

24. The filter media of claim 23 , wherein the filter media exhibits a moisture absorption of between about 20% and about 50% by weight after 3 hours of exposure to the moist environment.

25. The filter media of claim 23 , wherein the filter media exhibits a TMP adsorption of greater than about 30% by weight after 3 hours of exposure to a TMP environment.

26. The filter media of claim 25 , wherein the filter media exhibits a TMP adsorption of between about 30% and about 110% after 3 hours of exposure to the TMP environment.

27. The filter media of claim 23 , wherein the fibrillated fibers have a Canadian Standard Freeness level of fibrillation of between about 110 mL and about 650 mL.

28. The filter media of claim 23 , wherein the functional particles have an average surface area of greater than about 1200 m 2 /g.

29. The filter media of claim 23 , further comprising a scrim.

30. The filter media of claim 23 , wherein the filter media has an air permeability of between about 1.5 cfm/sf and about 30 cfm/sf.

31. The filter media of claim 23 , wherein the filter media has an average surface area of between about 900 m 2 /g and about 2500 m 2 /g.

32. The filter media of claim 1 , wherein the filter media further comprises synthetic fibers.

Assignees

• Hollingsworth & Vose Co

Inventors

• Krupnikov Svetlana
• Gaudry Sada Erich Jurgen

Classifications

• B01D2239/0407

  comprising particulate additives, e.g. adsorbents · CPC title

• B01D2239/064

  The fibres being mixed · CPC title

• B01D2253/202

  Polymeric adsorbents · CPC title

• B01D53/0407 Primary

  Constructional details of adsorbing systems · CPC title

• B01D53/02 Primary

  by adsorption, e.g. preparative gas chromatography {(solid sorbent compositions B01J20/00, preparation of inorganic compounds or elements C01)} · CPC title