Monsanto Technology LLC

William A Scholle

Peter E Rogers

Mark A Leiber

Lowell R Smith

Robert B Weisenfeld

Peng Lei

Chil Y Choi

Gregory A Hartmann

William Poncez

Juan Pedro Arhancet

Jerry R Ebner

Jerald D Heise

Kam-To Wan

Michael Rogers

Eduardo Aurelio Casanova

Eric A Haupfear

Henry H Chien

Fuchen Liu

Anthony Woods

Amy L Jorgenson

William B Hooper

Jingye Liu

Karen A Wittler, Legal Representative

Chen-Hsyong Yang

The present invention generally relates to processes for recovery of phosphorus values and salt impurities from aqueous waste streams. In particular, the present invention relates to processes for recovery of phosphorus values and salt impurities from aqueous waste streams generated in the manufacture of phospho-herbicides, including N-(phosphonomethyl)glycine and glufosinate.

Recovery of phosphorus values and salt impurities from aqueous waste streams

This invention relates to an improved catalyst, comprising a carbon support having a noble metal at its surface, for use in catalyzing liquid phase oxidation reactions, especially in an acidic oxidative environment and in the presence of solvents, reactants, intermediates, or products which solubilize noble metals; a process for the preparation of the improved catalyst; a liquid phase oxidation process using such a catalyst wherein the catalyst exhibits improved resistance to noble metal leaching, particularly in acidic oxidative environments and in the presence of solvents, reactants, intermediates, or products which solubilize noble metals; and a liquid phase oxidation process in which N-(phosphonomethyl)iminodiacetic acid (i.e., 'PMIDA') or a salt thereof is oxidized to form N-(phosphonomethyl) glycine (i.e., 'glyphosate') or a salt thereof using such a catalyst wherein the oxidation of the formaldehyde and formic acid by-products into carbon dioxide and water is increased.

Deeply reduced oxidation catalyst and its use in preparing N-(phosphonomethyl) glycine compounds

This invention generally relates to liquid phase oxidation processes for making N-(phosphonomethyl)glycine (also known in the agricultural chemical industry as glyphosate) and related compounds. This invention, for example, particularly relates to processes wherein an N-(phosphonomethyl)iminodiacetic acid (NPMIDA) substrate (i.e., N-(phosphonomethyl)iminodiacetic acid, a salt of N-(phosphonomethyl)iminodiacetic acid, or an ester of N-(phosphonomethyl)iminodiacetic acid) is continuously oxidized to form an N-(phosphonomethyl)glycine product (i.e., N-(phosphonomethyl)glycine, a salt of N-(phosphonomethyl)glycine, or an ester of N-(phosphonomethyl)glycine). This invention also, for example, particularly relates to processes wherein an N-(phosphonomethyl)iminodiacetic acid substrate is oxidized to form an N-(phosphonomethyl)glycine product, which, in turn, is crystallized (at least in part) in an adiabatic crystallizer.

Reaction systems for making N-(phosphonomethyl) glycine compounds

Growing community of inventors

Webster Groves, MO, United States of America

William A Scholle