US3954848A
Expired / Lapsed
US
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Process for producing N-phosphonomethyl glycine
Assignee: Monsanto Co
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Filing: 1972-05-31
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Granted: 1976-05-04
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Expires: 1992-05-31
Abstract
Abstract N-phosphonomethyl glycine is produced by the oxidation of N-(phosphonomethyl) iminodiacetic acid in the presence of an acid. N-phosphonomethyl glycine is useful as a herbicide.
Inventors
- 👤 John E. Franz
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 20:53
CPC Classifications
C; C07; C07F; C07F9/00; C07F9/02; C07F9/28; C07F9/38; C07F9/3804; C07F9/3808
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
108 words
A process for the production of N-phosphonomethyl glycine which comprises reacting N-(phosphonomethyl)iminodiacetic acid with an oxidizing agent selected from the group consisting of hydrogen peroxide, nitric acid, sodium hypochlorite, nitric oxide, lead tetra acetate, permanganic acid, dichromic acid, chlorine dioxide, persulfuric acid, perboric acid, tertiary-butylhydroperoxide, cumylhydroperoxide, peracetic acid, perbenzoic acid, peroxy trifluoroacetic acid, m-chloroperbenzoic acid, benzoyl-peroxide and benzene persulfonic acid in an aqueous acidic media wherein the acid is selected from the group consisting of sulfuric, hydrofluoric, phosphoric, fluorosulfuric, pyrophosphoric, nitric, acetic, formic, propionic, moni, di and trichloroacetic, mono, di and trifluoroacetic, benzenesulfonic, p-toluenesulfonic and benzenephosphonic acid and at a temperature of from about 70° to about 100°C.
Claim 2
Dependent Claim
108 words
A process for the production of N-phosphonomethyl glycine which comprises reacting N-(phosphonomethyl)iminodiacetic acid with an oxidizing agent selected from the group consisting of hydrogen peroxide, nitric acid, sodium hypochlorite, nitric oxide, lead tetra acetate, permanganic acid, dichromic acid, chlorine dioxide, persulfuric acid, perboric acid, tertiary-butylhydroperoxide, cumylhydroperoxide, peracetic acid, perbenzoic acid, peroxy trifluoroacetic acid, m-chloroperbenzoic acid, benzoyl-peroxide and benzene persulfonic acid in an aqueous acidic media wherein the acid is selected from the group consisting of sulfuric, hydrofluoric, phosphoric, fluorosulfuric, pyrophosphoric, nitric, acetic, formic, propionic, moni, di and trichloroacetic, mono, di and trifluoroacetic, benzenesulfonic, p-toluenesulfonic and benzenephosphonic acid and at a temperature of from about 70° to about 100°C.
Claim 3
Dependent Claim
12 words
The process of claim 1 wherein the oxidizing agent is hydrogen peroxide.
Claim 4
Dependent Claim
14 words
The process of claim 1 wherein the acidic media is an organic acid media.
Claim 5
Dependent Claim
11 words
The process of claim 3 wherein the acid is formic acid.
Claim 6
Dependent Claim
12 words
The process of claim 4 wherein the oxidizing agent is hydrogen peroxide.
Claim 7
Dependent Claim
14 words
The process of claim 1 wherein the oxidizing agent is an organic oxidizing agent.
Claim 8
Dependent Claim
20 words
The process of claim 1 wherein the oxidizing agent is hydrogen peroxide and the acidic media is aqueous sulfuric acid.
Claim 9
Dependent Claim
21 words
The process of claim 7 wherein at least two equivalents of hydrogen peroxide is employed for each equivalent of N-phosphonomethyliminodiacetic acid.
Claim 10
Dependent Claim
15 words
The process of claim 1 wherein the time of reaction is at least 1 hour.
Claim 11
Dependent Claim
15 words
The process of claim 8 wherein the time of reaction is at least 1 hour.
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) | 1979-05-04 | 1979-11-03 | 1980-05-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-05-04 | 1983-11-03 | 1984-05-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-05-04 | 1987-11-03 | 1988-05-04 | $7700.00 | Window Closed / Lapsed |