Reaction systems for making n-(phosphonomethyl)glycine...

C - Chemistry – Metallurgy – 07 – F

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C07F 9/38 (2006.01)

Patent

CA 2409745

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.

D'une manière générale, l'invention concerne des opérations d'oxydation en phase liquide destinées à préparé de la N-(phosphonométhyl)glycine (également connue dans l'industrie agrochimie sous le nom de glyphosate), ainsi que des composé associés. Par exemple, cette invention concerne notamment des opérations dans lesquelles un substrat d'acide N-(phosphonométhyl)imidoacétique (soit de l'acide N-(phosphonométhyl)imidodiacétique, un sel d'acide N-(phosphonométhyl)imidodiacétique ou un ester d'acide N-(phosphonométhyl)imidodiacétique) est oxydé en continu de manière à former un produit de N-(phosphonométhyl)glycine (soit de la N-(phosphonométhyl)glycine, un sel de N-(phosphonométhyl)glycine ou un ester de N-(phosphonométhyl)glycine). Cette invention, par exemple, se rapporte notamment à des opérations dans lesquelles un substrat d'acide N-(phosphonométhyl)iminodiacétique est oxydé de façon à former un produit de N-(phosphonométhyl)glycine, lequel, est à son tour cristallisé (au moins en partie) dans un cristalliseur adiabatique.

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