Claims
- 1. 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.
- 2. Process as defined in claim 1 wherein said superatmospheric pressure is at least about 1.5 Kg/cm.sup.2.
- 3. Process as defined in claim 1 wherein said contacting is carried out at a temperature of from about 25.degree. C. to 150.degree. C.
- 4. Process as defined in claim 3 wherein said contacting is carried out at a temperature of at least about 90.degree. C.
- 5. Process as defined in claim 1 wherein said salt-forming cation is alkali metal.
- 6. Process as defined in claim 1 wherein said salt-forming cation is said organic ammonium.
- 7. Process as defined in claim 1 wherein said contacting is carried out with the monoisopropylamine salt of N-phosphonomethyliminodiacetic acid.
- 8. Process as defined in claim 1 wherein said contacting is carried out with the mono(dimethylamine)salt of N-phosphonomethyliminodiacetic acid.
- 9. Process as defined in claim 1 wherein said contacting is carried out with the monopotassium salt of N-phosphonomethyliminodiacetic acid.
- 10. Process as defined in claim 1 wherein said contacting is carried out with the mono(trimethylamine)salt of N-phosphonomethyliminodiacetic acid.
- 11. Process as defined in claim 1 wherein said contacting is carried out with the monoammonium salt of N-phosphonomethyliminodiacetic acid.
- 12. Process as defined in claim 1 wherein said superatmospheric pressure is at least about 1.5 Kg/cm.sup.2, and said contacting is carried out at a temperature of from about 90.degree. C. to 150.degree. C.
- 13. Process as defined in claim 12 wherein said contacting is carried out with the monoisopropylamine salt of N-phosphonomethyliminodiacetic acid.
- 14. Process as defined in claim 12 wherein said contacting is carried out with the mono(dimethylamine)salt of N-phosphonomethyliminodiacetic acid.
- 15. Process as defined in claim 12 wherein said contacting is carried out with the monopotassium salt of N-phosphonomethyliminodiacetic acid.
- 16. Process as defined in claim 12 wherein said contacting is carried out with the mono(trimethylamine)salt of N-phosphonomethyliminodiacetic acid.
- 17. Process as defined in claim 12 wherein said contacting is carried out with the monoammonium salt of N-phosphonomethyliminodiacetic acid.
Parent Case Info
This application is a continuation-in-part of copending application Ser. No. 753,232, filed Dec. 20, 1976, now abandoned.
US Referenced Citations (3)
Continuation in Parts (1)
|
Number |
Date |
Country |
Parent |
753232 |
Dec 1976 |
|