US3645682A
Expired / Lapsed
US
⏱️ 0.0 years remaining
A process for producing phosphoric acid by the use of ion exchange resins
Assignee: Multi Minerals Ltd
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Filing: 1967-09-13
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Granted: 1972-02-29
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Expires: 1987-09-13
Abstract
Abstract The invention relates to an improved method of ion exchange. The inventive concept involves directly contacting a substantially dry ion exchange resin with a substantially dry material which material is solubilized by the resin. The inventive principle is applicable to cationic or anionic resins and is adaptable to fixed bed, semimoving bed or continuous ion exchange systems. New results and advantages include significantly improved quality and yield of ion exchange product. The invention is particularly applicable to the production of phosphoric acid produced by reacting monocalcium orthophosphate with a strong acid ion exchange resin on the hydrogen cycle.
Inventors
- 👤 Linden Wayne Cochran
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 12:56
CPC Classifications
C; C22; C22B; C22B60/00; C22B60/02; C22B60/0204; C22B60/0217; C22B60/0252; C22B60/0265; B; B01; B01J; B01J47/00; B01J47/10; C01; C01B; C01B25/00; C01B25/16; C01B25/18; C01B25/185; C01B7/00; C01B7/01; C01B7/07; C01B7/0706; C01B7/0718; C01G; C01G37/00; C01G37/003; C01G43/00; C22B3/00; C22B3/20; C22B3/42; Y; Y02; Y02P; Y02P10/00; Y02P10/20
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
18 words
A process as claimed in claim 1 in which the resin is of the nuclear sulfonic acid type.
Claim 2
Dependent Claim
19 words
A process as claimed in claim 1 wherein said salt contains between 10 and 14 percent free phosphoric acid.
Claim 3
Dependent Claim
19 words
A process according to claim 1 wherein said sequence of steps are repeatedly performed to provide a continuous process.
Claim 4
Dependent Claim
36 words
A process according to claim 1 wherein said resin, before dividing, is introduced to a loading zone by pulsation with a phosphoric acid medium having a composition substantially the same as the desired ion exchange product.
Claim 5
Dependent Claim
32 words
A process according to claim 1 wherein the resin remaining after the separating step is washed to remove substantially entrained solids, the washed resin is regenerated and recylced to the dividing step.
Claim 6
Dependent Claim
28 words
A process according to claim 1 wherein the first contacting step is conducted in a first vessel and the second contacting step is conducted in a second vessel.
Claim 7
Dependent Claim
34 words
A process according to claim 7 wherein mass transfer from said first vessel to said second vessel is carried out by permitting the mass in said first vessel to drop into said second vessel.
Claim 8
Dependent Claim
14 words
A process as claimed in claim 1 wherein agitation is employed to aid solubilization.
Claim 9
Dependent Claim
29 words
A method according to claim 1 wherein the first portion of the resin comprises at least about 30 percent of the total quantity of resin employed in both steps.
Claim 10
Dependent Claim
13 words
A method according to claim 1 wherein heating is employed to aid solubilization.
References Cited (Backward Citations)
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Cited
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-02-28 | 1975-08-30 | 1976-02-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-02-28 | 1979-08-30 | 1980-02-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-02-28 | 1983-08-30 | 1984-02-29 | $7700.00 | Window Closed / Lapsed |