Use of a supplemental promoter in conjunction with a...

C - Chemistry – Metallurgy – 07 – F

Patent

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Details

C07F 9/38 (2006.01) C07B 33/00 (2006.01)

Patent

CA 2395206

This invention relates to the use of a supplemental promoter in conjunction with a noble-metal-containing catalyst comprising a carbon support in catalyzing liquid phase oxidation reactions, a process for making of an improved catalyst comprising such a supplemental promoter, and an improved catalyst comprising such a supplemental promoter. In a particularly preferred embodiment, a supplemental promoter (most preferably bismuth or tellurium) is used in conjunction with a noble-metal-containing catalyst comprising a carbon support in a liquid phase oxidation process wherein 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. The benefits of such a process include increased oxidation of the formaldehyde and formic acid by-products, and, consequently, decreased final concentrations of those by-products as well as other undesirable by-products, most notably N-methyl-N-(phosphonomethyl)glycine (i.e., "NMG").

Cette invention concerne l'utilisation d'un promoteur supplémentaire conjointement à un catalyseur contenant un métal noble comprenant un support de carbone pour catalyser des réactions d'oxydation en phase liquide, un procédé de production d'un catalyseur amélioré contenant un tel promoteur supplémentaire, et un catalyseur amélioré contenant ce promoteur supplémentaire. Dans un mode de réalisation particulièrement préféré, un promoteur supplémentaire (idéalement du bismuth ou du tellure) est utilisé conjointement à un catalyseur contenant un métal noble comprenant un support de carbone dans un processus d'oxydation en phase liquide dans lequel un acide N-(phosphonométhyl) iminodiacétique (c'est-à-dire, "PMIDA") ou un sel de celui-ci est oxydé pour former une N-(phosphonométhyl) glycine (c'est-à-dire, "glyphosate") ou bien un sel de celle-ci. Les avantages de ce procédé sont une oxydation accrue des produits dérivés de formaldéhyde et d'acide formique, et, par conséquent, des concentrations finales réduites de ces produits dérivés de même que d'autres produits dérivés indésirables, de façon la plus notable la N-méthyl-N-(phosphonométhyl) glycine (c'est-à-dire, "NMG").

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