Patent US3950402A successfully refreshed from Google Patents.
US3950402A
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US
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Process for producing N-phosphonomethyl glycine
Assignee: Monsanto Co
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Filing: 1973-02-16
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Granted: 1976-04-13
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Expires: 1993-02-16
Abstract
Abstract N-phosphonomethyl glycine is produced by the oxidation of N-(phosphonomethyl) iminodiacetic acid. N-(Phosphonomethyl) iminodiacetic acid is heated to an elevated temperature in an aqueous medium and an oxidizing agent (H 2 O 2 , air plus a catalyst such as platinum, palladium, rhodium, etc.) added to oxidize the N-(phosphonomethyl) iminodiacetic acid to N-phosphonomethyl glycine, which is recovered by crystallization.
Inventors
- 👤 John E. Franz
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 20:28
CPC Classifications
C; C07; C07F; C07F9/00; C07F9/02; C07F9/28; C07F9/38; C07F9/3804; C07F9/3808; C07F9/3813
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
60 words
A process for the production of N-phosphonomethyl glycine which comprises forming an admixture of N-(phosphonomethyl)iminodiacetic acid, water and a metallic catalyst selected from the class consisting of platinum, palladium, rhodium, iridium, ruthenium or osmium, heating said admixture to an elevated temperature and contacting said admixture with a free oxygen-containing gas whereby said N-(phosphonomethyl)iminodiacetic acid is oxidized to yield N-phosphonomethyl glycine.
Claim 2
Dependent Claim
60 words
A process for the production of N-phosphonomethyl glycine which comprises forming an admixture of N-(phosphonomethyl)iminodiacetic acid, water and a metallic catalyst selected from the class consisting of platinum, palladium, rhodium, iridium, ruthenium or osmium, heating said admixture to an elevated temperature and contacting said admixture with a free oxygen-containing gas whereby said N-(phosphonomethyl)iminodiacetic acid is oxidized to yield N-phosphonomethyl glycine.
Claim 3
Dependent Claim
12 words
The process of claim 1 wherein the free oxygen-containing gas is air.
Claim 4
Dependent Claim
12 words
The process of claim 1 wherein the free oxygen-containing gas is oxygen.
Claim 5
Dependent Claim
10 words
The process of claim 2 wherein the catalyst is rhodium.
Claim 6
Dependent Claim
10 words
The process of claim 2 wherein the catalyst is platinum.
Claim 7
Dependent Claim
10 words
The process of claim 2 wherein the catalyst is palladium.
Claim 8
Dependent Claim
10 words
The process of claim 3 wherein the catalyst is rhodium.
Claim 9
Dependent Claim
10 words
The process of claim 3 wherein the catalyst is platinum.
Claim 10
Dependent Claim
10 words
The process of claim 3 wherein the catalyst is palladium.
Claim 11
Dependent Claim
23 words
The process of claim 1 wherein the reaction is conducted at super atmospheric pressure and the temperature is from 90°C. to about 120°C.
Claim 12
Dependent Claim
10 words
The process of claim 10 wherein the catalyst is platinum.
Claim 13
Dependent Claim
10 words
The process of claim 10 wherein the catalyst is palladium.
Claim 14
Dependent Claim
10 words
The process of claim 10 wherein the catalyst is rhodium.
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) | 1979-04-13 | 1979-10-13 | 1980-04-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-04-13 | 1983-10-13 | 1984-04-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-04-13 | 1987-10-13 | 1988-04-13 | $7700.00 | Window Closed / Lapsed |