Patent US3607739A successfully refreshed from Google Patents.
US3607739A
Expired / Lapsed
US
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Desalting and purifying water by continuous ion exchange
Assignee: Gulf Degremont Inc
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Filing: 1968-07-11
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Granted: 1971-09-21
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Expires: 1988-07-11
Abstract
Abstract A method and apparatus are provided for the continuous treatment of brackish water, sea water, industrial wastes or sewage effluents using continuous ion exchange. Three units are provided in series, the raw water entering the first unit and the purified water leaving the third unit. While the water moves continuously through the three units, an ion exchange resin is caused to flow countercurrent therethrough, a weak base anion exchange resin in the bicarbonate state passing through the first unit and the same resin, in the free base form, passing through the third unit. Passing through the second unit countercurrent to the effluent is a weak acid cation exchange resin. After passage through the first and second units, the resins are regenerated.
Inventors
- 👤 Charles H Thorborg
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 09:15
CPC Classifications
C; C02; C02F; C02F1/00; C02F1/52; B; B01; B01J; B01J47/00; B01J47/10
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
285 words
Apparatus for carrying out the desalting of water comprising an alkalization unit for removing the anions from raw water, means to continuously feed raw water to said alkalization unit, means to continuously feed weak base anion exchange resin in bicarbonate form to said alkalization unit countercurrent to the water flow, means to continuously discharge contaminated anion exchange resin from said alkalization unit, and means to continuously discharge a first effluent from said alkalization unit; a dealkalization unit for receiving said first effluent from said alkalization unit and removing cations from said first effluent to provide a second effluent, means to continuously feed weak acid cation exchange resin through said dealkalization unit countercurrent to the effluent flow, means to continuously regenerate contaminated weak acid cation exchange resin, means to continuously pass contaminated weak acid ion exchange resin to said cation regenerating means, means to pass said regenerated weak acid cation exchange resin from said regenerating means back to said dealkalization unit, and means to continuously discharge said second effluent from said dealkalization unit; a carbonation unit for receiving said second effluent from said dealkalization unit, means to continuously feed weak base anion exchange resin in free base form to said carbonation unit countercurrent to the effluent flow, means to continuously discharge the anion exchange resin in bicarbonate form and recycle same to said alkalization unit, and means to continuously discharge purified water from said carbonation unit; and an anion exchange resin regenerating means, means to supply regenerant to said anion resin regenerating means, means to pass contaminated anion exchange resin from said alkalization unit to said anion exchange regenerating means, and means for passing regenerated anion exchange resin in free base form to said carbonation unit.
Claim 2
Dependent Claim
31 words
continuously passing said first effluent countercurrent to a weak acid cation exchange resin represented by the formula R''-H, wherein R'' is the resin, to yield a second effluent containing carbon dioxide;
Claim 3
Dependent Claim
48 words
continuously passing the contaminated weak anion exchange resin from step one now represented by the formula R-X, wherein X is an anionic impurity, to a regeneration zone, introducing basic regenerant to said zone and thereby continuously regenerating said resin to obtain a resin represented by the formula R-OH;
Claim 4
Dependent Claim
17 words
A process in accordance with claim 1 wherein said basic regenerant used in step (3) comprises NH4OH.
Claim 5
Dependent Claim
17 words
A process in accordance with claim 1 wherein said acidic regenerant used in step (6) comprises H2SO4.
Claim 6
Dependent Claim
23 words
continuously passing said second effluent from step two countercurrent to said resin R-OH from step three, thereby obtaining pure water and resin R-HCO3;
Claim 7
Dependent Claim
9 words
continuously recycling said resin R-HCO3 to step one; and
Claim 8
Dependent Claim
40 words
A process in accordance with claim 1 wherein said acid resin R''-H is washed with water immediately prior to its usage in step (2); and said resin R-OH is washed with water immediately prior to its usage in step (4).
Claim 9
Dependent Claim
28 words
A process in accordance with claim 1 wherein said resins flow downwardly and said raw water and effluents flow upwardly in said countercurrent steps (1), (2) and (4).
Claim 10
Dependent Claim
39 words
continuously passing the contaminated weak acid cation exchange resin from step two to a regeneration zone, introducing acidic regenerant to said zone and thereby continuously regenerating said cation exchange resin, and recycling said cation exchange resin to step two.
Claim 11
Dependent Claim
37 words
Apparatus in accordance with claim 2 further comprising means to wash said regenerated weak base anion exchange resin in free base form, said washing means being located between said anion resin regeneration means and said carbonation unit.
Claim 12
Dependent Claim
33 words
Apparatus in accordance with claim 2 further comprising means to wash said regenerated weak acid cation exchange resin, said washing means being located between said cation resin regeneration means and said dealkalization unit.
Claim 13
Dependent Claim
27 words
Apparatus in accordance with claim 2 further comprising means to inject CO2 into contact with said anion exchange resin between said carbonation unit and said alkalizatIon unit.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-09-20 | 1975-03-22 | 1975-09-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-09-20 | 1979-03-22 | 1979-09-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-09-20 | 1983-03-22 | 1983-09-21 | $7700.00 | Window Closed / Lapsed |