Manufacture of substantially pure monochloroacetic acid

Details Manufacture of substantially pure monochloroacetic acid Manufacture of substantially pure monochloroacetic acid

C - Chemistry, Metallurgy

07

C

C07C 51/377 (2006.01) C07C 53/16 (2006.01)

Patent

CA 2660872

A process for the manufacture of substantially pure monochloroacetic acid from a liquid chloroacetic acid mixture comprising monochloroacetic acid and dichloroacetic acid, in particular in an amount of 2 to 40 percent by weight, wherein said mixture, further mixed with a suspended hydrogenation catalyst, is mixed with hydrogen gas and the resulting mixture is brought to reaction in a reactor, which is characterized in that the reactor is a loop reactor comprising a gas and liquid recirculation system coupled via an ejector mixing nozzle, in which reactor the gas and liquid are circulated in co-current flow, and the mixing intensity introduced to the liquid phase is at least 50 W/l of liquid phase.

La présente invention concerne un procédé de fabrication d'acide monochloroacétique sensiblement pur à partir d'un mélange d'acide chloroacétique liquide comprenant de l'acide monochloroacétique et de l'acide dichloroacétique, en particulier à raison de 2 à 40 % en poids. En l'occurrence, ce mélange qui sera ensuite mélangé à un catalyseur d'hydrogénation en suspension est mélangé à de l'hydrogène gazeux et le mélange obtenu est mis en réaction dans un réacteur. La caractéristique en est que le réacteur est un réacteur en boucle comprenant un système de recyclage des gaz et liquides, couplé par l'intermédiaire d'une buse de mélange d'éjecteur, réacteur dans lequel les gaz et les liquides sont mis en circulation en flux cocourant, l'intensité du mélange introduit dans la phase liquide étant d'au moins 50 W/l de phase liquide.

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