Adsorptive filter medium

Patent metadata

Field	Value
Publication number	US-9242202-B2
Application number	US-201214388619-A
Country	US
Kind code	B2
Filing date	Dec 27, 2012
Priority date	Mar 28, 2012
Publication date	Jan 26, 2016
Grant date	Jan 26, 2016

Abstract

The invention relates to an adsorptive filter medium (i.e. a filter unit or filter structure) which is suitable for purifying gases and/or gas mixtures, preferably air, and also for removing chemical and/or biological poisons and/or pollutants from gases and/or gas mixtures, preferably air, and also to the use thereof.

First claim

The invention claimed is:

1. An adsorptive filter medium for purification of gases and gas mixtures,
wherein the filter medium comprises:
a plurality of a first filter element having a first adsorption material in the form of adsorbent particles, and
a plurality of a second filter element which is different from the first filter element and has a second adsorption material in the form of adsorbent particles;

wherein the first adsorption material and the second adsorption material are each independently formed from granular activated carbon,
wherein the first filter elements and the second filter elements are disposed in stack form or stacked atop each other,
wherein at least one first filter element is disposed upstream of at least one second filter element,
wherein the first filter element and the second filter element have mutually different pressure drops and/or mutually different flow resistances, wherein the second filter element has a greater pressure drop and/or flow resistance than the first filter element, and
wherein it is a second filter element which is disposed in the downstream direction as the filter element which is positioned in the last place, wherein the second filter element positioned in the last place in the downstream direction has a higher pressure drop and/or flow resistance than the filter elements disposed upstream of the filter element positioned in the last place.

2. The filter medium as claimed in claim 1 ,
wherein the filter medium is bounded in the upstream direction by at least one first filter element.

3. The filter medium as claimed in claim 1 ,
wherein the first filter element positioned in the first place in the downstream direction has a lower pressure drop and/or flow resistance than the filter elements disposed downstream of the filter element which is positioned in the first place.

4. The filter medium as claimed in claim 1 ,
wherein the first filter elements and the second filter elements are disposed alternatingly and/or mutually alternately and/or periodically.

5. The filter medium as claimed in claim 1 ,
wherein the first and/or second filter elements are disposed blockwise.

6. The filter medium as claimed in claim 1 ,
wherein the first filter elements and/or the second filter elements are disposed alternatingly blockwise.

7. The filter medium as claimed in claim 1 ,
wherein the filter medium and/or the first filter element and/or the second filter element are box shaped, cuboid shaped or cylinder shaped.

8. The filter medium as claimed in claim 1 ,
wherein the first filter element and the second filter element have at least essentially identical breadths and/or depths and/or at least essentially identical diameters, based on the extent transversely and/or perpendicularly to the main flowthrough direction.

9. The filter medium as claimed in claim 1 , wherein the density of the first filter element is less than the density of the second filter element.

10. The filter medium as claimed in claim 1 ,
wherein the pressure drop and/or flow resistance of the second filter element exceeds by a factor in the range from 1.5 to 300 the pressure drop and/or flow resistance of the first filter element.

11. The filter medium as claimed in claim 1 ,
wherein the ratio of the pressure drop and/or flow resistance of the second filter element to the pressure drop and/or flow resistance of the first filter element is in the range from 500:1 to 1.5:1.

12. The filter medium as claimed in claim 1 ,
wherein the first filter element has a pressure drop and/or flow resistance in the range from 0.1 Pa/cm to 100 Pa/cm and wherein the second filter element has a pressure drop and/or flow resistance in the range from 1 Pa/cm to 250 Pa/cm, with the proviso that the pressure drop and/or flow resistance of the second filter element is greater than the pressure drop and/or flow resistance of the first filter element.

13. The filter medium as claimed in claim 1 ,
wherein the first filter element comprises at least one first carrier material, wherein the first adsorption material is fixed to the first carrier material and wherein the first carrier material has a three-dimensional structure; and
wherein the second filter element comprises at least one second carrier material, wherein the second adsorption material is fixed to the second carrier material and wherein the second carrier material has a sheetlike structure.

14. The filter medium as claimed in claim 1 ,
wherein the first adsorption material and/or the second adsorption material are each independently formed from spherical activated carbon.

15. The filter medium as claimed in claim 1 ,
wherein the first adsorption material and/or the second adsorption material each independently have particle sizes in the range from 0.001 to 5 mm.

16. The filter medium as claimed in claim 1 ,
wherein the first adsorption material and the second adsorption material differ in at least one physical and/or chemical parameter, wherein the physical and/or chemical parameter is selected from the group of (i) particle size; (ii) specific surface area (BET surface area); (iii) pore volume; (iv) porosity; (v) pore distribution; (vi) impregnation and/or catalytic endowment and (vii) particle shape.

17. The filter medium as claimed in claim 1 ,
wherein the first adsorption material and the second adsorption material have different particle sizes, wherein the first adsorption material has a larger particle size than the second adsorption material.

18. The filter medium as claimed in claim 1 ,
wherein the particle sizes of the first adsorption material, on the one hand, and of the second adsorption material, on the other hand, differ from each other by at least 0.01 mm, with the proviso that the second adsorption material has the smaller sizes.

19. The filter medium as claimed in claim 1 ,
wherein the filter medium additionally comprises at least one particle and/or aerosol filter layer.

20. A method of using a filter medium as claimed in claim 1 for sorptive applications, for gas cleaning, for gas purification, for air cleaning or for air purification.

21. A method of using a filter medium as claimed in claim 1 for the removal of noxiants or of gases or substances that are toxic, harmful or environmentally damaging or of chemical and/or biological poison and/or noxiant materials.

22. A filter or a filter material for removal of noxiant, odorant and poisonous materials of any kind from air and/or gas streams, with the filter or filter material comprising at least one filter medium as claimed in claim 1 .

23. The filter or filter material as claimed in claim 22 , wherein the filter or filter material is selected from the group consisting of NBC respirator filters, odor filters, sheet filters, air filters, filters for indoor air cleaning, adsorption-capable carrier structures and filters for the medical sector.

Assignees

• Bluecher Gmbh

Inventors

• Boehringer Bertram
• Gonzalez Omar Guerra
• Eckle Isebill

Classifications

• B01J20/28047

  Gels · CPC title

• B01J39/00

  Cation exchange; Use of material as cation exchangers; Treatment of material for improving the cation exchange properties (ion-exchange chromatography processes B01D15/36) · CPC title

• B01D2259/4541

  for portable use, e.g. gas masks · CPC title

• B01J20/103

  comprising silica · CPC title

• B01D2239/065

  More than one layer present in the filtering material · CPC title