Patent · US Active

Method for the manufacture of phosphonoalkyl iminodiacetic acid

US9315528B2 · kind B2 · utility

0Cited by

6References

13Claims

0Family size

Assignee

STRAITMARK HOLDING AG · CH

Inventors

Patrick Notté · Wavre, BE
David Lemin · Brussels, BE
Cedric Nicolas Pirard · Bolland, BE

Key dates

Filing date	Oct 27, 2010
Grant date	Apr 19, 2016
Priority date	—
Expiry date	Oct 27, 2030

Classification

Technology area (CPC C)Chemistry; Metallurgy
CPC primaryC07F9/3808
WIPO fieldOrganic fine chemistry
WIPO sectorChemistry

Abstract

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.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.