US3639231A
Expired / Lapsed
US
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Desalination process
Assignee: Bresler and Associates Inc
•
Filing: 1970-11-13
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Granted: 1972-02-01
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Expires: 1990-11-13
Abstract
Abstract Brackish water is desalinated by contacting it with one or more ion exchange resins followed by reverse osmosis. Brine rejected in reverse osmosis treatment can be used to regenerate a used ion exchange resin.
Inventors
- 👤 Sidney A Bresler
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 09:49
CPC Classifications
B; B01; B01D; B01D61/00; B01D61/02; B01D61/04; B01D61/025; B01J; B01J49/00; C; C02; C02F; C02F9/00; B01D2311/00; B01D2311/04; C02F1/00; C02F1/42; C02F1/44; C02F1/441; C02F2103/00; C02F2103/08; C02F2303/00; C02F2303/16; Y; Y02; Y02A; Y02A20/00; Y02A20/124; Y02A20/131
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
132 words
The process for removing inorganic salts from an aqueous solution containing the same, which comprises: a. contacting said solution with an ion exchange resin active at a pH of from about 5 to about 14, to remove ions present in said solution, b. contacting the solution obtained in (a) with an ion exchange resin active at a pH of from about 1 to about 14, to remove ions present in said last-mentioned solution, c. forcing the solution obtained in (b) through a reverse osmosis membrane which rejects and concentrates salts present in said solution, d. collecting an aqueous product having an inorganic salt content substantially less than said aqueous solution, and an inorganic salt product, and e. regenerating said ion exchange resin of (b) with said inorganic salt product collected in (d).
Claim 2
Dependent Claim
13 words
The process of claim 2, wherein the aqueous solution is a brackish water.
Claim 3
Dependent Claim
21 words
The process of claim 2, wherein the ion exchange resin of (a) is an acrylic acid resin having carboxylic acid groups.
Claim 4
Dependent Claim
18 words
The process of claim 2, wherein the ion exchange resin of (b) is a sodium sulfonate vinyl benzene.
Claim 5
Dependent Claim
13 words
The process of claim 2, wherein the membrane of (c) comprises cellulose acetate.
Claim 6
Dependent Claim
13 words
The process of claim 2, wherein the membrane of (c) comprises a nylon.
Claim 7
Dependent Claim
31 words
The process of claim 2, wherein the ion exchange resin of (a) is regenerated with the stream obtained by regenerating said ion exchange resin of (b) with said inorganic salt product.
Claim 8
Dependent Claim
21 words
The process of claim 2, wherein the ion exchange resin of (b) is a vinyl benzene containing a quaternary ammonium substituent.
Claim 9
Dependent Claim
114 words
The process for removing inorganic salts from an aqueous solution containing the same, which comprises: a. contacting said solution with an ion exchange resin active at a pH of from about 5 to about 14, to remove ions present iN said solution, b. contacting the solution obtained in (a) with an ion exchange resin active at a pH of from about 1 to about 14, to remove ions present in said last-mentioned solution, c. forcing the solution obtained in (b) through a reverse osmosis membrane which rejects salts present in said solution, and d. collecting an aqueous product having an inorganic salt content substantially less than said aqueous solution, and an inorganic salt product.
Claim 10
Dependent Claim
31 words
The process of claim 1 wherein said inorganic salt product collected in (c) contains an acid component and wherein said ion exchange resin of (a) is regenerated with said acid component.
Claim 11
Dependent Claim
31 words
The process of claim 2 wherein said inorganic salt product collected in (d) contains an acid component and wherein said ion exchange resin of (b) is regenerated with said acid component.
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) | 1975-01-31 | 1975-08-02 | 1976-02-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-01-31 | 1979-08-02 | 1980-02-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-01-31 | 1983-08-02 | 1984-02-01 | $7700.00 | Window Closed / Lapsed |