US4153441A
Expired / Lapsed
US
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Process for making magnesium potassium ammonium phosphate
Assignee: Sumitomo Corp
•
Filing: 1978-08-01
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Granted: 1979-05-08
•
Expires: 1998-08-01
Abstract
Abstract Process for making magnesium potassium ammonium phosphate, using ammonia, urea, potassium hydroxide, magnesium hydroxide, and phosphoric acid with specified maxima of iron, alumina, and sulfate.
Inventors
- 👤 William L. Guithues
- 👤 Casimer C. Legal, Jr.
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 22:43
CPC Classifications
C; C05; C05B; C05B9/00
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
140 words
In the method of making magnesium potassium ammonium phosphate having a water soluble nitrogen of not more than 2% by the steps of (a) preparing an aqueous reaction slurry by reacting together phosphoric acid of 40-61% P 2 O 5 , ammonia, urea, potassium hydroxide, and magnesium hydroxide in a reactor-granulating zone, thereby to form granules; (b) screening the said granules to give granulated product and fines; (c) recycling the fines from (b) to the granulating zone in (a); the improvement comprising using, as the phosphoric acid reactant, phosphoric acid which is not furnace grade, but has the following analysis (basis, 60% P 2 O 5 ): So 4 (as H 2 SO 4 ) not more than about 3% Fe 2 O 3 , not more than about 0.5% Al 2 O 3 , not more than about 0.3%.
Claim 2
Dependent Claim
140 words
In the method of making magnesium potassium ammonium phosphate having a water soluble nitrogen of not more than 2% by the steps of (a) preparing an aqueous reaction slurry by reacting together phosphoric acid of 40-61% P 2 O 5 , ammonia, urea, potassium hydroxide, and magnesium hydroxide in a reactor-granulating zone, thereby to form granules; (b) screening the said granules to give granulated product and fines; (c) recycling the fines from (b) to the granulating zone in (a); the improvement comprising using, as the phosphoric acid reactant, phosphoric acid which is not furnace grade, but has the following analysis (basis, 60% P 2 O 5 ): So 4 (as H 2 SO 4 ) not more than about 3% Fe 2 O 3 , not more than about 0.5% Al 2 O 3 , not more than about 0.3%.
Claim 3
Dependent Claim
39 words
Method according to claim 1 in which the phosphoric acid has the following analysis: ______________________________________
%
______________________________________
H.sub.2 O 14.3-16.0
P.sub.2 O.sub.5
59.0-61.0
Fe.sub.2 O.sub.3
0.3-0.5
Al.sub.2 O.sub.3
0.1-0.3
F 0.2-0.4
H.sub.2 SO.sub.4
1.5-3.0
MgO 0.3-1.0
Solids 0.1-0.5.
______________________________________
References Cited (Backward Citations)
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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) | 1982-05-07 | 1982-11-06 | 1983-05-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1986-05-07 | 1986-11-06 | 1987-05-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1990-05-07 | 1990-11-06 | 1991-05-08 | $7700.00 | Window Closed / Lapsed |