Method for isolating N-phosphonomethylglycine

Details Method for isolating N-phosphonomethylglycine Method for isolating N-phosphonomethylglycine

1997-03-11

1999-01-12

Barts, Samuel

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

Organic compounds

Phosphorus acids or salts thereof

502 18, C07F 938

Patent

active

058592890

ABSTRACT:
The present invention provides a method for isolating N-phosphonomethylglycine which comprises adding an acid to precipitate salts from an aqueous solution of an alkali metal salt and/or an alkaline earth metal salt of N-phosphonomethylglycine solution to neutralize and adjust the same to a pH of 2.5 or higher, removing the precipitated salts, and adjusting the pH to 2.5 or lower to crystallize N-phosphonomethylglycine. N-phosphonomethylglycine is thus isolated and purified in high purity and good yield.

REFERENCES:
patent: 5324855 (1994-06-01), Morikawa et al.
patent: 5453537 (1995-09-01), Morikawa et al.

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