US3926610A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Removal of fertilizer precipitate
Assignee: Phillips Petroleum Co
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Filing: 1974-06-10
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Granted: 1975-12-16
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Expires: 1994-06-10
Abstract
Abstract A process is disclosed wherein the precipitate formed during storage of a liquid phosphate-based fertilizer is removed by addition of phosphoric acid in an amount sufficient to form a solution thereof having a pH of less than about 3.2. Thereafter by pH adjustment such that there is provided a solution having a pH of 5.0 to 6.6, there is obtained a solution of the originally precipitated material which is in a form to be useful as a fertilizer.
Inventors
- 👤 Joseph R Kenton
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 09:49
CPC Classifications
C; C05; C05B; C05B13/00; C05B13/06; C05G; C05G5/00; C05G5/20; C05G5/23
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
108 words
A PROCESS FOR TREATING THE SLURRY PRECIPITATE OF A LIQUID FERITIZER CONSISTING ESSENTIALLY OF AN AQUEOUS SOLUTION OF AMMONIUM POLYPHOSPHATE CONTAINING 10 WEIGHT PERCENT OF NITROGEN, 34 WEIGHT PERCENT OF P2 O3 AND NO POTASH , SAID PROCESS COMPRISING A. MIXING SAID SLURRY PRECIPITATE WITH AN ACID SELECTED FROM THE GROUP CONSISTING OF THE ACIDS OF PHOSPHORUS AND NITRIC ACID, B. ADJUSTING THE QUANTITY OF ACID EMPLOYED WITH RESPECT TO THE QUANTITY OF LIQUID PRECIPITATE EMPOLYED SO THAT A SOLUTION HAVING A PH OF 3 IS OBTAINED, C. NEUTRALIZING SAID SOLUTION BY THE ADDITION OF AMMONIA TO A PH IN THE RANGE OF ABOUT 5 TO ABOUT 6.6.
Claim 2
Dependent Claim
108 words
A PROCESS FOR TREATING THE SLURRY PRECIPITATE OF A LIQUID FERITIZER CONSISTING ESSENTIALLY OF AN AQUEOUS SOLUTION OF AMMONIUM POLYPHOSPHATE CONTAINING 10 WEIGHT PERCENT OF NITROGEN, 34 WEIGHT PERCENT OF P2 O3 AND NO POTASH , SAID PROCESS COMPRISING A. MIXING SAID SLURRY PRECIPITATE WITH AN ACID SELECTED FROM THE GROUP CONSISTING OF THE ACIDS OF PHOSPHORUS AND NITRIC ACID, B. ADJUSTING THE QUANTITY OF ACID EMPLOYED WITH RESPECT TO THE QUANTITY OF LIQUID PRECIPITATE EMPOLYED SO THAT A SOLUTION HAVING A PH OF 3 IS OBTAINED, C. NEUTRALIZING SAID SOLUTION BY THE ADDITION OF AMMONIA TO A PH IN THE RANGE OF ABOUT 5 TO ABOUT 6.6.
Claim 3
Dependent Claim
42 words
A process in accordance with claim 1 wherein said slurry precipitate is mixed with an acid solution consisting of 75 to 55 weight percent of H3PO4 and 25 to 45 weight percent of polyphosphoric acid in a weight ratio of about 1:1.
Claim 4
Dependent Claim
33 words
A process in accordance with claim 1 wherein ammonia is added to neutralize said solution in such a quantity as to result in a solution having a pH of about 5.8 to 6.0.
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) | 1978-12-15 | 1979-06-16 | 1979-12-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-12-15 | 1983-06-16 | 1983-12-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-12-15 | 1987-06-16 | 1987-12-16 | $7700.00 | Window Closed / Lapsed |