US4147719A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for producing N-phosphonomethylglycine salts
Assignee: Monsanto Co
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Filing: 1978-07-21
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Granted: 1979-04-03
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Expires: 1998-07-21
Abstract
Abstract Salts of N-phosphonomethylglycine are produced by forming a salt of N-phosphonomethyliminodiacetic acid with a salt-forming cation in an aqueous medium and then oxidizing the salt solution with an oxygen-containing gas in the presence of a platinum on activated carbon catalyst. The salts produced are useful as herbicides or plant growth regulants.
Inventors
- 👤 John E. Franz
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 18:24
CPC Classifications
B; B01; B01J; B01J23/00; B01J23/38; B01J23/40; B01J23/42; C; C07; C07F; C07F9/00; C07F9/02; C07F9/28; C07F9/38; C07F9/3804; C07F9/3808; C07F9/3813
Claims Analysis
Total Claims: 18
Claim 1
Independent Claim
84 words
Process for preparing a mono or di salt of N-phosphonomethylglycine wherein the salt-forming cation is selected from the group consisting of cations of alkali metals, alkaline earth metals, ammonium and organic ammonium, provided that when the organic group is aryl, the ammonium salt is a primary amine salt, which comprises contacting, at superatmospheric pressure, an aqueous solution of a corresponding mono or di salt of N-phosphonomethyliminodiacetic acid with an oxygen-containing gas in the presence of an oxidation catalyst which is platinum on activated carbon.
Claim 2
Dependent Claim
84 words
Process for preparing a mono or di salt of N-phosphonomethylglycine wherein the salt-forming cation is selected from the group consisting of cations of alkali metals, alkaline earth metals, ammonium and organic ammonium, provided that when the organic group is aryl, the ammonium salt is a primary amine salt, which comprises contacting, at superatmospheric pressure, an aqueous solution of a corresponding mono or di salt of N-phosphonomethyliminodiacetic acid with an oxygen-containing gas in the presence of an oxidation catalyst which is platinum on activated carbon.
Claim 3
Dependent Claim
18 words
Process as defined in claim 1 wherein said superatmospheric pressure is at least about 1.5 Kg/cm 2 .
Claim 4
Dependent Claim
23 words
Process as defined in claim 1 wherein said contacting is carried out at a temperature of from about 25° C. to 150° C.
Claim 5
Dependent Claim
21 words
Process as defined in claim 3 wherein said contacting is carried out at a temperature of at least about 90° C.
Claim 6
Dependent Claim
13 words
Process as defined in claim 1 wherein said salt-forming cation is alkali metal.
Claim 7
Dependent Claim
14 words
Process as defined in claim 1 wherein said salt-forming cation is said organic ammonium.
Claim 8
Dependent Claim
19 words
Process as defined in claim 1 wherein said contacting is carried out with the monoisopropylamine salt of N-phosphonomethyliminodiacetic acid.
Claim 9
Dependent Claim
18 words
Process as defined in claim 1 wherein said contacting is carried out with the mono(dimethylamine)salt of N-phosphonomethyliminodiacetic acid.
Claim 10
Dependent Claim
19 words
Process as defined in claim 1 wherein said contacting is carried out with the monopotassium salt of N-phosphonomethyliminodiacetic acid.
Claim 11
Dependent Claim
18 words
Process as defined in claim 1 wherein said contacting is carried out with the mono(trimethylamine)salt of N-phosphonomethyliminodiacetic acid.
Claim 12
Dependent Claim
19 words
Process as defined in claim 1 wherein said contacting is carried out with the monoammonium salt of N-phosphonomethyliminodiacetic acid.
Claim 13
Dependent Claim
35 words
Process as defined in claim 1 wherein said superatmospheric pressure is at least about 1.5 Kg/cm 2 , and said contacting is carried out at a temperature of from about 90° C. to 150° C.
Claim 14
Dependent Claim
19 words
Process as defined in claim 12 wherein said contacting is carried out with the monoisopropylamine salt of N-phosphonomethyliminodiacetic acid.
Claim 15
Dependent Claim
18 words
Process as defined in claim 12 wherein said contacting is carried out with the mono(dimethylamine)salt of N-phosphonomethyliminodiacetic acid.
Claim 16
Dependent Claim
19 words
Process as defined in claim 12 wherein said contacting is carried out with the monopotassium salt of N-phosphonomethyliminodiacetic acid.
Claim 17
Dependent Claim
18 words
Process as defined in claim 12 wherein said contacting is carried out with the mono(trimethylamine)salt of N-phosphonomethyliminodiacetic acid.
Claim 18
Dependent Claim
19 words
Process as defined in claim 12 wherein said contacting is carried out with the monoammonium salt of N-phosphonomethyliminodiacetic acid.
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) | 1982-04-02 | 1982-10-02 | 1983-04-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1986-04-02 | 1986-10-02 | 1987-04-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1990-04-02 | 1990-10-02 | 1991-04-03 | $7700.00 | Window Closed / Lapsed |