Monsanto Technology LLC

Jian Xu

Eduardo Aurelio Casanova

Justin Robert Struble

Peng Fan

The present invention is generally directed to improved processes for the preparation of various phosphorus oxides and phosphoric acid. Phosphorus oxides prepared in accordance with the present invention include phosphorus (III) oxides (e.g., tetraphosphorus hexaoxide (PO)). Phosphorus (III) oxides such as POare useful products and are also useful as precursors in preparation of other products, including phosphorous acid (HPO) and other phosphorus-containing chemicals. Certain aspects of this invention are also directed to using various byproducts formed during POproduction as precursors for the formation of phosphoric acid (HPO) and PO. In particular, the present invention is directed to improved processes for the preparation of phosphorus (III) oxides (e.g., PO) suitable for use in the preparation of phospho-herbicides such N-(phosphonomethyl)glycine (glyphosate) and precursors thereof (e.g., N-(phosphonomethyl)iminodiacetic acid (PMIDA)). The present invention is thus further directed to preparation of these compounds.

Phosphorus oxide and phosphoric acid production processes

This invention relates to an improved electrodialysis method for preparing an amino acid from a salt of the amino acid utilizing a three-compartment bipolar membrane electrodialysis process wherein an aqueous electrolyte comprising an exogenous acid is added to the acid compartment of a three-compartment bipolar membrane apparatus. The exogenous acid is different than the amino acid and typically has a pKa less than the pKa of the amino acid.

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Wildwood, MO, United States of America

Jian Xu