Composite ion exchange media for liquid filtration systems
Provided are filtration media and matrixes comprising a pulverized powder of ion exchange resin and a polymeric binder. The resin can be pulverized to an average particle size in the range of 50 to 250 microns and can comprise a cation exchange resin, an anion exchange resin, a chelating resin, a biologically-related ion exchange resin, or combinations thereof. The media can further comprise activated carbon. The binder can be ultra high molecular weight polyethylene. The filtration media can be used to make matrixes and systems. Methods of making and using the same are also provided.
1. A block comprising a filtration matrix comprising a polymeric binder that immobilizes a pulverized powder of an ion exchange resin; the polymeric binder and the pulverized powder of the ion exchange resin having point-to-point bonds in the block formed by a mold compression step of the filtration matrix; the polymeric binder present in an amount in the range of 10% to 40% by weight and the pulverized powder of the ion exchange resin present in an amount of 50% to 90% by weight; the pulverized powder of the ion exchange resin having an average particle size in the range of about 50 to about 250 micron; wherein the ion exchange resin comprises a cation exchange resin, an anion exchange resin, a chelating exchange resin, a biologically-related ion exchange resin, or combinations thereof; and wherein water passes radially through the block.
2. The block of claim 1 , further comprising activated carbon that is immobilized by the polymeric binder.
3. The block of claim 2 , wherein the activated carbon is present in an amount of 15% by weight of the media.
4. The block of claim 1 , wherein the polymeric binder comprises ultra high molecular weight polyethylene.
5. The block of claim 4 , wherein the polymeric binder comprises particles having an irregular, convoluted surface formed from ultra high molecular weight polyethylene.
6. The block of claim 1 , wherein the pulverized powder of the ion exchange resin has an average particle size of 100 to 150 microns.
7. The block of claim 1 , wherein the filtration matrix is effective to provide an increased hardness reduction as compared to a comparative bed media that comprises an ion exchange resin in bead form that is not immobilized by a binder.
8. The block of claim 1 , wherein the filtration matrix is effective to provide lower pressure drop as compared to a comparative bed media that comprises an ion exchange resin in bead form that is not immobilized by a binder.
9. The block of claim 1 , wherein the pulverized powder of the ion exchange resin has an average particle size of about 125 microns.
10. The block of claim 1 , wherein the pulverized powder of the ion exchange resin comprises 63 weight percent, the polymeric binder comprises 22 weight percent and the filtration matrix comprises 15 weight percent of an activated carbon.
11. The block of claim 1 , wherein the pulverized powder of the ion exchange resin has an average particle size in the range of 100 to 150 micron and wherein the polymeric binder has an average particle size in the range of 20 to 80 microns.