Process for the production of N-phosphonomethylalycine and salts

Details Process for the production of N-phosphonomethylalycine and salts Process for the production of N-phosphonomethylalycine and salts

1995-11-13

1997-10-21

Geist, Gary

Organic compounds -- part of the class 532-570 series

Organic compounds

Phosphorus acids or salts thereof

C07F 938

Patent

active

056798431

ABSTRACT:
A process whereby N-phosphonomethylglycine (glyphosate) or its salts is manufactured by:
1) forming N-phosphonomethylglycinonitrile by reacting aminomethylphosphonic acid, an alkali metal cyanide and formaldehyde in aqueous solution at a pH in the range from 10 to 13 (and preferably from 11 to 11.5) whilst adding mineral acid at a rate sufficient to maintain the pH within the desired range, and thereafter
2) hydrolysing the N-phosphonomethylglycinonitrile product of Stage (1) to form a salt of N-phosphonomethylglycine and optionally
3) neutralising the salt of N-phosphonomethylglycine to form N-phosphonomethylglycine

REFERENCES:
patent: 4221583 (1980-09-01), Gaertner et al.
patent: 5324855 (1994-06-01), Morikawa et al.
patent: 5453537 (1995-09-01), Morikawa et al.
Chemical Abstract 106:120064c(1987).

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