Electrodeionization apparatus and method
AssigneeUnited States Filter Corporation
InventorsFelice DiMascio, Gary C. Ganzi
Life of this patent
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Abstract
An improved electrodeionization apparatus and method are provided. The electrodeionization apparatus includes an ion-concentrating compartment, an ion-depleting compartment, and electrolyte compartments, wherein alternating layers of anion exchange resins and cation exchange resins are positioned in the ion-depleting compartment, and the anion exchange resins comprise Type II anion resins. The incorporation of Type II anion material, alone or with Type I anion material, in anion permeable membranes and/or resins improves the electric current distribution, degree of resin regeneration, and deionization performance.
Claims44
An electrodeionization apparatus, comprising:
- an ion-concentrating compartment;
- an ion-depleting compartment;
- and
- an anode and a cathode;
- wherein alternating layers of anion exchange resins and cation exchange resins are positioned in said ion-depleting compartment, and said layers of anion exchange resins and cation exchange resins are separated by an intermediate material layer, and said anion exchange resins comprise Type II anion resin material.
An electrodeionization apparatus, comprising:
- alternating layers of Type II anion exchange resins, Type I anion exchange resins, and cation exchange resins positioned in an ion-depleting component.
A method for purifying a fluid in an electrodeionization apparatus, comprising:
- providing an ion-concentrating compartment, an ion-depleting compartment, an anode, and a cathode;
- filling said ion-depleting compartment with alternating layers of cation and anion exchange resins, and positioning an intermediate material layer between said layers of anion exchange resins and cation exchange resins, wherein said anion exchange resins comprise Type II anion resins;
- passing a fluid stream through said ion-depleting compartment;
- and
- applying an electric field across said anode and cathode.
An electrodeionization apparatus, comprising:
- an ion-concentrating compartment;
- an ion-depleting compartment, wherein alternating layers of anion exchange resins and cation exchange resins are positioned in said ion-depleting compartment, and said anion exchange resins comprise Type II anion resin material;
- and
- an anode and a cathode;
- wherein said compartments are divided by at least one anion or cation permeable membrane, and said at least one anion permeable membrane comprises Type II anion exchange resins.
A method for purifying a fluid in an electrodeionization apparatus, comprising:
- providing an ion-concentrating compartment, an ion-depleting compartment, an anode, and a cathode;
- filling said ion-depleting compartment with alternating layers of cation and anion exchange resins, wherein said anion exchange resins comprise Type II anion resins, and wherein said compartments are divided by at least one anion or cation permeable membrane, said at least one anion permeable membrane comprises Type II anion exchange resins;
- passing a fluid stream through said ion-depleting compartment;
- and
- applying an electric field across said anode and cathode.
Dependencies are inferred from the claim text.