Process for preparing N-phosphono-methyl-imino-diacetic acid

Details Process for preparing N-phosphono-methyl-imino-diacetic acid Process for preparing N-phosphono-methyl-imino-diacetic acid

1989-02-02

1990-06-05

Evans, J. E.

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

Organic compounds

Phosphorus acids or salts thereof

562554, 562571, C07F 938

Patent

active

049315854

ABSTRACT:
The invention relates to the preparation of N-phosphono-methyl-imino-diacetic acid from the calcium salt of imino-diacetic acid in a simplified synthesis. The process comprises in that the imino-diacetic acid calcium salt is heated with concentrated hydrochloric acid in a molar ratio of 2-3:1 at a temperature between 50.degree.-100.degree. C., the obtained imino-diacetic acid hydrogen-chloride is separated then dissolved in water and is reacted with phosphorous acid in a molar ratio of 1.0-1.2:1 calculated for imino-diacetic acid hydrogen chloride and with the aqueous solution of formaldehyde in a molar ratio of 1.0-1.4:1 under stirring, and the obtained product is isolated.

REFERENCES:
Chem. Abstracts, vol. 95, 20331t, 1981.

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