US3617558A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Layered ion exchange process
Assignee: Illinois Water Treatment Co
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Filing: 1970-11-02
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Granted: 1971-11-02
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Expires: 1990-11-02
Abstract
Abstract In an ion exchanger having a single upright tank with upper and lower stratified beds of resins respectively adapted to absorbing different ions (cations or anions) of the same ionic polarity, a distributor for the inflow of water into the tank is disposed substantially at the interface between the two beds and used to effect the upward backwashing of the upper bed alone and, during regeneration of weak-and-strong-type exchange resins by the same regenerant passed successively through the beds of strong-andweak-type resins, to dilute the regenerant to the concentration best suited for regeneration of the weak-type resin.
Inventors
- 👤 Gary D Jones
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 21:18
CPC Classifications
B; B01; B01J; B01J49/00; B01J49/60; B01J39/00; B01J39/04; B01J39/05; B01J41/00; B01J41/04; B01J41/05; B01J49/05
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
84 words
The method defined in claim 1 including the preliminary step of forcing water under pressure into said tank at a level adjacent the interface between the upper and lower resin layers and at a rate sufficient to expand the particles of said upper layer into a freeboard space above the upper layer and thus wash such matter out of the top of the tank without substantially disturbing the positions of the resin particles of said lower bed and the stratification of the two beds.
Claim 2
Dependent Claim
33 words
The method defined in claim 1 in which the layer of strong-type resin is disposed in said tank below the layer of weak resin and said regenerant is flowed upwardly through the tank.
Claim 3
Dependent Claim
66 words
The method defined in claim 1 including the additional steps of withdrawing from said tank, at a point adjacent said interface, the first part of said regenerant passing through said strong resin layer, and interrupting such withdrawal and allowing the remainder of the regenerant passing such resin layer to flow onwardly through the weak resin layer after being diluted by the water introduced adjacent the interface.
Claim 4
Dependent Claim
23 words
The method defined in claim 4 in which the amount of said withdrawn regenerant is a small fraction of the total regenerant volume.
Claim 5
Dependent Claim
133 words
For utilizing two beds of strong- and weak-type resins for removing different ions of the same ionic charges from an aqueous solution flowing successively first through the weak resin bed and then through the strong resin bed, the different resins being stratified and supported one above the other in an upright tank, the method of regenerating the resins of said beds which includes the steps of forcing into said tank a concentrated solution for regenerating the resins of both of said beds while causing a flow of such solution first through the resin of said strong type diluting the partially spent regenerant after the same has passed through said strong-type resin and to a concentration adapted for efficient regeneration of said weak-type resin, and flowing the diluted regenerant vertically through said weak-type resin.
Claim 6
Dependent Claim
55 words
In the operation of the ion exchanger as defined in claim 3, the additional steps for forcing water into the top of said tank to oppose the upflow of the combined upward flows of said regenerant and dilution water, and withdrawing said combined flows from said tank near the top of said upper resin bed.
Claim 7
Dependent Claim
51 words
In the operation of the ion exchanger as defined in claim 3, the additional step of maintaining said freeboard space filled with air during the upflow of said regenerant through said lower and upper beds while withdrawing the excess regenerant from the tank near the top of the upper resin bed.
Claim 8
Independent Claim
158 words
The method of ion exchange using upper and lower beds of strong- and weak-type resins respectively confined in an upright Tank and adapted to remove different ions of the same ionic charge from an aqueous solution, the steps of flowing a solution to be treated into said tank at the bottom thereof and withdrawing the same from the tank at a level adjacent the top of said upper bed, and, after exhaustion of the resins, interrupting such flow and regenerating both of the resins by flowing a solution of a regenerant therefor into said tank at a level adjacent the top of said upper resin bed, withdrawing said regenerant solution from the bottom of the tank and, during the downflow of said regenerant solution successively through said upper and lower beds, introducing water into said tank substantially at the interface between said upper and lower beds so as to dilute the regenerant passing downwardly through the lower bed.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-11-01 | 1975-05-03 | 1975-11-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-11-01 | 1979-05-03 | 1979-11-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-11-01 | 1983-05-03 | 1983-11-02 | $7700.00 | Window Closed / Lapsed |