Process for the preparation of carboxylic acid salts from...

C - Chemistry – Metallurgy – 07 – C

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C07C 227/02 (2006.01) C07C 229/16 (2006.01) C07C 229/08 (2006.01) C07C 229/12 (2006.01)

Patent

CA 2370621

The present invention provides a new and useful improvement in the process to manufacture a carboxylic acid salt, particularly an amino carboxylic acid salt, from a primary alcohol, particularly a primary aminoalcohol. The process of manufacturing amino carboxylic acid salts comprises contacting an aqueous solution of a primary aminoalcohol with a strong hydroxide base selected from the group consisting of an alkali metal hydroxide, an alkaline earth metal hydroxide, an ammonium hydroxide compound including a tetraalkyl ammonium hydroxide, or the like, in the presence of an effective amount of a catalyst. The catalyst comprises one or more of elements selected from the group consisting of copper, cobalt, nickel, and cadmium as well as optionally lesser amounts of chromium, titanium, niobium, tantalum, zirconium, vanadium, molybdenum, manganese, tungsten, cobalt, nickel, or mixtures thereof. The reaction mixture contains less than about 3000 ppm, preferably less than about 500 ppm, more preferably less than about 100 ppm of oxidized copper (Cu+ and/or Cu2+) during the reaction. The concentration of oxidizing agents in the reactants is minimized to prevent formation of oxidized copper from metallic copper catalyst.

La présente invention apporte une amélioration nouvelle et utile dans le procédé de fabrication de sel d'acide carboxylique, en particulier d'un sel d'acide amino-carboxylique, à partir d'un alcool primaire, en particulier d'un amino alcool primaire. Le procédé de fabrication de sels d'acide amino-carboxylique de l'invention consiste à mettre en contact un solution aqueuse d'un amino alcool primaire avec une base hydroxyde forte choisie dans le groupe composé d'un hydroxyde de métal alcalin, un hydroxyde de métal terreux alcalin, un composé d'hydroxyde d'ammonium comprenant un hydroxyde d'ammonium tétra-alkylé, ou analogue, en présence d'une quantité efficace de catalyseur. Le catalyseur comprend un ou plusieurs éléments choisis dans le groupe composé du cuivre, du cobalt, du nickel et du cadmium, ainsi que, facultativement et en moindres quantités, du chrome, du titane, du niobium, du tantale, du zirconium, du vanadium, du molybdène, du manganèse, du tungstène, du cobalt, du nickel ou des mélanges de ces derniers. Le mélange réactionnel contient moins de 3000 mg/l environ, de préférence moins de 500 mg/l environ, et de préférence encore moins de 100 mg/l de cuivre oxydé (Cu?+¿ et/ou Cu?2+¿) pendant la réaction. La concentration d'agents oxydants dans les réactifs est minimisée afin d'empêcher la formation de cuivre oxydé dans le catalyseur au cuivre métallique.

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