Process for preparing N,N-diacetic acid aminomethylenephosphonic

Details Process for preparing N,N-diacetic acid aminomethylenephosphonic Process for preparing N,N-diacetic acid aminomethylenephosphonic

1984-12-05

1988-02-09

Evans, J. E.

Chemistry of carbon compounds

Miscellaneous organic carbon compounds

C-metal

C07F 938

Patent

active

047241039

ABSTRACT:
An energy saving process for preparing N,N-diacetic acid aminomethylenephosphonic acid by reacting an alkali metal salt of iminodiacetic acid in aqueous strong mineral acid solution with phosphorous acid and formaldehyde and then adding sufficient water to dissolve the alkali metal salt formed during the reaction. The desired product is recovered as a precipitate from the solution.

REFERENCES:
patent: 2609390 (1952-09-01), Bersworth
patent: 3288846 (1966-11-01), Irani et al.
patent: 3904668 (1975-09-01), Gaudette et al.
patent: 4237065 (1980-12-01), Ehrat
patent: 4389349 (1983-06-01), Cho et al.

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