EP0346502A1
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EP
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Electrodeionization method and apparatus
Assignee: EMD Millipore Corp
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Filing: 1988-05-31
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Granted: —
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Expires: 2008-05-31
Abstract
Abstract An electrodeionization apparatus is provided for removing ions from liquids. Liquid to be purified is passed through at least two ion depletion compartments containing mixed anion and cation exchange resin beads in a given separation stage. A second liquid is passed through concentration compartments free of ion exchange resin beads. Ions under the influence of D.C. potential pass from the depletion compartments into the concentration compartments through ion permeable membranes. The beads in the depletion compartments are housed within subcompartments of controlled width and thickness and are retained therein by the ion permeable membranes which are secured to the walls of the subcompartments.
Inventors
- 👤 Anthony Giuffrida
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-10-30 05:55
CPC Classifications
B; B01; B01D; B01D61/00; B01D61/42; B01D61/44; B01D61/46; B01D61/48; B01J; B01J47/00; B01J47/02; B01J47/06; B01J47/08; C; C02; C02F; C02F1/00; C02F1/46; C02F1/469; C02F1/4693; C02F1/4695
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
247 words
Electrodeionization apparatus adapted to remove ions from a liquid which comprises: at least one separation stage comprising: a cathode compartment at a first end of said stage, an anode compartment at an end of said stage opposite said first end, a plurality of alternating ion depletion compartments and ion concentration compartments positioned between said cathode compartment and said anode compartment, each of said ion depletion compartments comprising a spacer and a plurality of subcompartments formed by a plurality of ribs extending along the length of each of said ion depletion compartments each of said subcompartments containing an ion exchange solid composition, each of said subcompartments having a width defined by the distance between said ribs of between about 0.3 and 4 inches and a thickness between about 0.05 and 0.25 inches and wherein the thickness of said subcompartments is defined by the distance between an anion permeable membrane and a cation permeable membrane being bonded to each of said ribs, along the length of said ribs, and to said spacer, each of said concentration compartments being free of ion exchange solid composition, means for passing a first liquid to be purified through at least two ion depletion compartments in said stage, means for passing a second liquid for accepting ions from said first liquid, through said concentration compartments, means for applying an electrical voltage between an anode in said anode compartment and a cathode in said compartment and, means for recovering purified liquid from said depletion compartments.
Claim 2
Dependent Claim
247 words
Electrodeionization apparatus adapted to remove ions from a liquid which comprises: at least one separation stage comprising: a cathode compartment at a first end of said stage, an anode compartment at an end of said stage opposite said first end, a plurality of alternating ion depletion compartments and ion concentration compartments positioned between said cathode compartment and said anode compartment, each of said ion depletion compartments comprising a spacer and a plurality of subcompartments formed by a plurality of ribs extending along the length of each of said ion depletion compartments each of said subcompartments containing an ion exchange solid composition, each of said subcompartments having a width defined by the distance between said ribs of between about 0.3 and 4 inches and a thickness between about 0.05 and 0.25 inches and wherein the thickness of said subcompartments is defined by the distance between an anion permeable membrane and a cation permeable membrane being bonded to each of said ribs, along the length of said ribs, and to said spacer, each of said concentration compartments being free of ion exchange solid composition, means for passing a first liquid to be purified through at least two ion depletion compartments in said stage, means for passing a second liquid for accepting ions from said first liquid, through said concentration compartments, means for applying an electrical voltage between an anode in said anode compartment and a cathode in said compartment and, means for recovering purified liquid from said depletion compartments.
Claim 3
Dependent Claim
18 words
The apparatus of claim 1 wherein the width of said subcompartments is between about 0.5 and 1.5 inches.
Claim 4
Dependent Claim
18 words
The apparatus of claim 1 wherein the thickness of said subcompartment is between about 0.06 and 0.125 inches.
Claim 5
Independent Claim
25 words
The apparatus of anyone of claims 1, 2 or 3 which includes means in said concentration compartments for effecting turbulent flow of said second liquid.
Claim 6
Independent Claim
55 words
The apparatus of any one of claims 1, 2 or 3 wherein the ion exchange composition comprises a mixture of anion exchange resin beads and cation exchange resin beads and wherein the volume ratio of anion exchange resin beads to cation exchange resin beads in said ion depletion compartments is between about 2.0 and 0.5.
Claim 7
Dependent Claim
67 words
Electrodeionization apparatus adapted to remove ions from a liquid which comprises a plurality of separation stages, each stage comprising: means for passing a second liquid for accepting ions from said first liquid, through into said concentration compartments, means for applying an electrical voltage between an anode in said anode compartment and a cathode in said cathode compartment and means for recovering purified liquid from said depletion compartments.
Claim 8
Dependent Claim
67 words
Electrodeionization apparatus adapted to remove ions from a liquid which comprises a plurality of separation stages, each stage comprising: means for passing a second liquid for accepting ions from said first liquid, through into said concentration compartments, means for applying an electrical voltage between an anode in said anode compartment and a cathode in said cathode compartment and means for recovering purified liquid from said depletion compartments.
Claim 9
Dependent Claim
17 words
The apparatus of claim 6 wherein the width of said subcompartments is about 0.5 and 1.5 inches.
Claim 10
Dependent Claim
18 words
The apparatus of claim 6 wherein the thickness of said subcompartment is between about 0.06 and 0.125 inches.
Claim 11
Independent Claim
26 words
The apparatus of any one of claims 6, 7 or 8 which includes means in said concentration compartments for effecting turbulent flow of said second liquid.
Claim 12
Independent Claim
54 words
The apparatus of any one of claims 6, 7 or 8 wherein the ion exchange composition comprises a mixture of anion exchange resin beads and cation exchange resin beads and wherein the volume ratio of anion exchange resin beads to cation exchange resin beads in said depletion compartments is between about 2.0 and 0.5.
References Cited (Backward Citations)
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