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US3687992A
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Solid nitrilotriacetate-metal complexes
Assignee: Monsanto Co
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Filing: 1969-09-29
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Granted: 1972-08-29
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Expires: 1989-09-29
Abstract
Abstract Solid nitrilotriacetate (NTA) - metal complexes having a metal to NTA molar ratio of more than 1.5 to 1, the metal being copper or manganese, are useful as micronutrients for plants and as catalysts in oxidation reactions. The solid complexes are prepared by reaction of a slurry of the metal salts with NTA in the molar ratio of 1:2 followed by drying. A small amount of mineral acid is an effective stabilizer for the solid complexes.
Inventors
- 👤 William A Feiler
- 👤 Chung Yu Shen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 11:16
CPC Classifications
C; C05; C05D; C05D9/00; C05D9/02; C05G; C05G3/00; C05G3/80
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
26 words
The solid complex of claim 1 wherein a 10 percent by weight solution of said complex has a pH of from about 7 to about 8.
Claim 2
Independent Claim
80 words
A method of preparing solid complexes of nitrilotriacetate and metal having a molar ratio of from 1.5:1 to 2:1 by reacting an admixture of a slurry of manganese or copper salts with a particulate ammonium, sodium or potassium nitrilotriacetate in a molar ratio of at least 1:1.5 at a temperature of about 0* to 100*C said metal salt and said nitrilotriacetate having a particle size such that 95 percent by weight pass through a U.S. Standard Sieve of 20 mesh.
Claim 3
Dependent Claim
18 words
The process of claim 3 wherein the metal salt is a sulfate and the nitrilotriacetate is sodium nitrilotriacetate.
Claim 4
Dependent Claim
30 words
The method of claim 3 wherein the reaction is carried out in the presence of a stabilizing amount of a mineral acid and wherein said metal salt is manganese sulfate.
Claim 5
Dependent Claim
12 words
The method of claim 5 wherein the mineral acid is sulfuric acid.
References Cited (Backward Citations)
US2859104A
Cited
US3095297A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-08-29 | 1976-02-28 | 1976-08-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-08-29 | 1980-02-28 | 1980-08-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-08-29 | 1984-02-28 | 1984-08-29 | $7700.00 | Window Closed / Lapsed |