Control of N-(phosphonomethyl)iminodiacetic acid conversion manufacture of glyphosate
AssigneeMonsanto Technology LLC
InventorsDonald D. Soleta, Peter E. Rogers, Eduardo A. Casanova, Robert E. Byrd, Eric A. Haupfear
Life of this patent
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Abstract
This invention relates to the preparation of N-(phosphonomethyl)glycine (“glyphosate”) from N-(phosphonomethyl)iminodiacetic acid (“PMIDA”), and more particularly to methods for control of the conversion of PMIDA, for the identification of reaction end points relating to PMIDA conversion and the preparation of glyphosate products having controlled PMIDA content.
Claims10
A method for monitoring or detecting conversion of N-(phosphonomethyl)iminodiacetic acid to N-(phosphonomethyl)glycine or an intermediate for N-(phosphonomethyl)glycine during catalytic oxidation of N-(phosphonomethyl)iminodiacetic acid in an aqueous medium, the method comprising:
- introducing the aqueous medium into an oxidation reaction zone, wherein the aqueous medium contains a mass of N-(phosphonomethyl)iminodiacetic acid;
- contacting N-(phosphonomethyl)iminodiacetic acid with molecular oxygen in said aqueous medium within said oxidation reaction zone in the presence of a catalyst, thereby effecting the catalytic oxidation of N-(phosphonomethyl)iminodiacetic acid and producing N-(phosphonomethyl)glycine or said intermediate;
- measuring an amount of molecular oxygen consumed in said oxidation reaction zone;
- and
- estimating a proportion of N-(phosphonomethyl)iminodiacetic acid that has been converted to N-(phosphonomethyl)glycine or said intermediate in said oxidation reaction zone, said estimating comprising comparing the amount of molecular oxygen consumed in said oxidation reaction zone with the mass of N-(phosphonomethyl)iminodiacetic acid introduced into the oxidation reaction zone and a unit oxygen consumption required for oxidation of N-(phosphonomethyl)iminodiacetic acid to N-(phosphonomethyl)glycine or said intermediate.
A method for monitoring or detecting conversion of N-(phosphonomethyl)iminodiacetic acid to N-(phosphonomethyl)glycine or an intermediate for N-(phosphonomethyl)glycine during catalytic oxidation of N-(phosphonomethyl)iminodiacetic acid in an aqueous medium, the method comprising:
- introducing the aqueous medium into an oxidation reaction zone, wherein the aqueous medium contains N-(phosphonomethyl)iminodiacetic acid;
- contacting N-(phosphonomethyl)iminodiacetic acid with molecular oxygen in said aqueous medium within said oxidation reaction zone in the presence of a catalyst, thereby effecting the catalytic oxidation of N-(phosphonomethyl)iminodiacetic acid and producing N-(phosphonomethyl)glycine or said intermediate;
- continually or repetitively measuring an amount of oxygen that is consumed in said oxidation reaction zone;
- monitoring an instantaneous rate of oxygen consumption in the oxidation reaction zone in the conversion of N-(phosphonomethyl)iminodiacetic acid to N-(phosphonomethyl)glycine or said intermediate;
- and
- estimating a residual concentration of N-(phosphonomethyl)iminodiacetic acid in said aqueous medium within said oxidation reaction zone, said estimating comprising comparing said instantaneous rate of oxygen consumption with the mass of aqueous medium containing N-(phosphonomethyl)iminodiacetic acid that is introduced into the oxidation reaction zone.
Dependencies are inferred from the claim text.