Organic compounds -- part of the class 532-570 series – Organic compounds – Phosphorus acids or salts thereof
Reexamination Certificate
2006-08-01
2006-08-01
Richter, Johann (Department: 1621)
Organic compounds -- part of the class 532-570 series
Organic compounds
Phosphorus acids or salts thereof
C562S502000, C562S571000, C562S014000, C562S554000
Reexamination Certificate
active
07084298
ABSTRACT:
The present invention relates to a process for the preparation of N-phosphonomethyliminodiacetic acid by reacting an alkali metal salt of iminodiacetic acid with phosphorus trichloride in aqueous solution with formation of the hydrochloride of iminodiacetic acid, phosphorous acid and of the corresponding alkali metal chloride, followed by reaction with a formaldehyde source and, if desired, recovery of the N-phosphonomethyliminodiacetic acid from the reaction mixture, in which water, which may comprise HCl, is removed from the reaction mixture during and/or after reacting the alkali metal salt of iminodiacetic acid with phosphorus trichloride until the concentration of iminodiacetic acid hydrochloride is at least 40% by weight, based on the weight of the reaction mixture minus the weight of alkali metal chloride.The process makes possible the preparation of N-phosphonomethyliminodiacetic acid in a simple fashion and in high yield.
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Drögemüller Michael
Maase Matthias
BASF - Aktiengesellschaft
Nwaonicha Chukwuma
Richter Johann
Voight Jason D.
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