Electrodeionization apparatus and method
AssigneeUnited States Filter Corporation
InventorsFelice DiMascio, Anil Jha, Gary C. Ganzi, Frederick Wilkins
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Abstract
Electrodeionization apparatus and method. The electrodeionization apparatus includes an ion-depleting compartment in which alternating layers of an electroactive media are positioned. One of the alternating layers is doped to provide a more balanced current distribution through the apparatus. The method involves reducing the difference in conductivity between the alternating layers positioned in the ion-depleting compartment by adding a dopant material to one of the layers.
Claims83
An electrodeionization apparatus, comprising:
- an ion-depleting compartment comprising alternating layers of ion exchange resin material;
- wherein at least one of said alternating layers comprises a specialized electroactive media, and said specialized electroactive media comprises a Type I anion exchange resin material;
- and
- at least one of said alternating layers comprises a doped cation exchange resin material.
The electrodeionization apparatus of any of the preceding claims, wherein said ion-depleting compartment includes opposing membranes spaced apart by at least about {fraction (1/16)} inch.
An electrodeionization apparatus, comprising:
- an ion-depleting compartment comprising alternating layers of ion exchange resin material;
- at least one of said alternating layers comprising a specialized electroactive media;
- at least one of said alternating layers comprising a doped cation exchange resin material, wherein said dopant material comprises said specialized electroactive media;
- wherein said specialized electroactive media comprises at least about 60 percent of a Type I anion exchange resin material.
An electrodeionization apparatus, comprising:
- an ion-depleting compartment comprising alternating layers of ion exchange resin material, wherein at least one layer comprises a dopant material.
A method for purifying a fluid in an electrodeionization apparatus, comprising:
- providing an electrodeionization apparatus having an ion-depleting compartment;
- providing a first ion exchange resin material having a first conductivity value and a second ion exchange resin material having a second conductivity value different than the first;
- reducing the difference between said first and second conductivity values by adding a dopant material to one of said first or second ion exchange resin materials;
- positioning said first and second ion exchange resin materials in alternating layers in said ion-depleting compartment;
- passing a fluid stream through said ion-depleting compartment;
- and
- applying an electric field across said electrodeionization apparatus.
An electrodeionization apparatus, comprising:
- an ion-depleting compartment comprising alternating layers of ion exchange resin material, each layer having substantially the same thickness, wherein at least one layer comprises a dopant material.
An electrodeionization apparatus, comprising:
- an ion-depleting compartment comprising alternating layers of ion exchange resin material, wherein a first layer comprises a doped cation exchange resin material, said apparatus constructed and arranged to provide a flow of water to be introduced into said first layer.
An electrodeionization apparatus, comprising:
- an ion-depleting compartment constructed and arranged to provide ionic substitution in said ion-depleting compartment, and substantially uniform current distribution throughout said apparatus,
- said compartment including alternating layers of ion exchange resin material, at least one layer including a dopant material.
Dependencies are inferred from the claim text.