Method for producing N-phosphonomethylglycine

Details Method for producing N-phosphonomethylglycine Method for producing N-phosphonomethylglycine

1997-03-11

1998-05-12

Barts, Samuel

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

Organic compounds

Phosphorus acids or salts thereof

C07F 938

Patent

active

057507740

ABSTRACT:
The present invention provides a method for producing N-phosphonomethylglycine which comprises reacting an aminomethylphosphonic acid with glycolonitrile, or formaldehyde and hydrogen cyanide in situ, under an alkaline condition to convert the aminomethylphosphonic acid into an N-phosphonomethylglycinonitrile salt or a mixture of an N-phosphonomethylglycinonitrile salt and N-phosphonomethylglycinonitrile, and then hydrolyzing the product under an acidic condition. Subsequent to a reaction step for the production of N-phosphonomethylglycinonitrile, the reaction product is hydrolyzed by adding thereto an acid in a prescribed amount. Accordingly, the use of a large amount of an alkaline metal hydroxide and the neutralization step for obtaining N-phosphonomethylglycine after hydrolysis, which steps are necessary in a conventional alkali hydrolysis method, are omitted in the present invention.

REFERENCES:
patent: 3923877 (1975-12-01), Barton
patent: 4221583 (1980-09-01), Gaertner et al.
patent: 5324855 (1994-06-01), Morikawa et al.
patent: 5453537 (1995-09-01), Morikawa et al.
patent: 5679844 (1997-10-01), Miyata
Chemical Abstracts, vol. 118, No. 5, 1 Feb. 1993, Abstract No. 039415.
Chemical Abstracts, vol. 124, No. 23, 3 Jun. 1996, Abstract No. 317885.
Chemical Abstracts, vol. 125, No. 17, 1996, Abstract No. 222444.

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