Method for the manufacture of phosphonoalkyl iminodiacetic acid

Method for the manufacture of phosphonoalkyl iminodiacetic acid

An improved method for the manufacture of phosphonoalkyl iminodiacetic acid M2PO3-X-N-(CH2COOM)2 wherein X is a C1-6 linear or branched alkyl group; and M is selected from hydrogen, alkali, earth-alkali, ammonium and protonated amine is disclosed. The iminodiacetic acid starting material is reacted...

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Bibliographische Detailangaben
Hauptverfasser: LEMIN DAVID, NOTTÉ PATRICK, PIRARD CEDRIC NICOLAS
Format: Patent
Sprache:eng
Schlagworte:
ACYCLIC, CARBOCYCLIC OR HETEROCYCLIC COMPOUNDS CONTAININGELEMENTS OTHER THAN CARBON, HYDROGEN, HALOGEN, OXYGEN, NITROGEN,SULFUR, SELENIUM OR TELLURIUM
CHEMISTRY
METALLURGY
ORGANIC CHEMISTRY
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Zusammenfassung:An improved method for the manufacture of phosphonoalkyl iminodiacetic acid M2PO3-X-N-(CH2COOM)2 wherein X is a C1-6 linear or branched alkyl group; and M is selected from hydrogen, alkali, earth-alkali, ammonium and protonated amine is disclosed. The iminodiacetic acid starting material is reacted with a substantially stoichiometric amount of phosphorous acid, in the presence of a large excess of phosphoric acid to thereby yield a reaction medium insoluble reaction product (PAI-DA) which can be separated from the reaction medium. In a particularly preferred approach, the phosphorous acid is prepared in situ starting from liquid P4O6.