Absorbent and/or adsorptive filter media

• US 9,352,267 B2
• Filed: 12/21/2012
• Issued: 05/31/2016
• Est. Priority Date: 06/20/2012
• Status: Expired due to Fees

• Current Assignee: Hollingsworth & Vose Company
• Original Assignee: Hollingsworth & Vose Company
• Inventors: Gaudry Sada, Erich Jurgen, Krupnikov, Svetlana
• Primary Examiner(s): Jones, Christopher P
• Application Number:
  US13/723,607
• Publication Number:
  US 20130340613A1
• Time in Patent Office: 1,257 Days
• US Class Current: 1/1
• CPC Class Codes: B01D 2239/0407 comprising particulate additives, e.g. adsorbents
• CPC Class Codes: B01D 2239/064 The fibres being mixed
• CPC Class Codes: B01D 2239/0654 Support layers
• CPC Class Codes: B01D 2239/1233 Fibre diameter
• CPC Class Codes: B01D 2253/202 Polymeric adsorbents
• CPC Class Codes: B01D 2257/80 Water
• CPC Class Codes: B01D 39/1623 of synthetic origin
• CPC Class Codes: B01D 39/18 the material being cellulose or derivatives thereof cork or peat B01D39/1646 ; making filter paper D21F11/14
• CPC Class Codes: B01D 53/02 by adsorption, e.g. preparative gas chromatography solid sorbent compositions B01J20/00, preparation of inorganic compounds or elements C01
• CPC Class Codes: B01D 53/0407 Constructional details of adsorbing systems

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.

Claims

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 m²/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 m²/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 m²/g and about 2500 m²/g.

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

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

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 m²/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 m²/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 m²/g and about 2500 m²/g.