Claims
- 1. A filter for cleaning air, said filter comprising a porous, air-permeable three-dimensional support having ion exchanger beads affixed thereon, said support comprising a large-pore, reticulated polyolefin foam and the affixation of the ion exchanger beads is effected by heating the polyolefin foam such that the polyolefin lattice becomes sufficiently tacky to durably fix the ion exchanger beads thereon, said ion exchanger beads being distributed such that the fixed beads have hollow spaces between them which are from 0.1 to 3 times the average bead diameter in size.
- 2. A filter according to claim 1, wherein the fixed beads have hollow spaces between them which are from 0.5 to 1 times the average bead diameter in size.
- 3. A filter according to claim 1, wherein said support comprises a network of polymeric strands which are enveloped by a layer of the ion exchanger beads.
- 4. A filter according to claim 1, wherein the ion exchanger beads are strongly basic anion exchangers.
- 5. A filter according to claim 1, wherein the ion exchanger beads are strongly acid cation exchangers.
- 6. A filter according to claim 1, wherein said polyolefin foam is hydrophilically modified.
- 7. A filter according to claim 1, wherein said polyolefin foam has a porosity of from 8 to 30 ppi.
- 8. A filter according to claim 1, further comprising an adhesive for securing the ion exchanger beads to the support.
- 9. A filter according to claim 8, wherein said adhesive comprises a di- or polyisocyanate prepolymer which crosslinks in the presence of moisture.
- 10. A method of cleaning a gas stream to remove at least one contaminant selected from the group consisting of gaseous basic substances, gaseous acidic substances and formaldehyde, said method comprising the step of passing said gas stream through a filter according to claim 1.
- 11. A method according to claim 10, wherein sulfur dioxide is removed from said gas stream.
- 12. A method according to claim 10, wherein ammonia is removed from said gas stream.
Priority Claims (1)
Number |
Date |
Country |
Kind |
197 27 295 |
Jun 1997 |
DE |
|
Parent Case Info
This application is a 371 of PCT application No. PCT/EP98/03867, filed on Jun. 24, 1998.
PCT Information
Filing Document |
Filing Date |
Country |
Kind |
PCT/EP98/03867 |
|
WO |
00 |
Publishing Document |
Publishing Date |
Country |
Kind |
WO99/00192 |
1/7/1999 |
WO |
A |
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