Improved process for producing carboxylic acids

Details Improved process for producing carboxylic acids Improved process for producing carboxylic acids

C - Chemistry, Metallurgy

07

C

C07C 51/265 (2006.01) C07C 51/21 (2006.01) C07C 63/26 (2006.01) C07C 67/39 (2006.01)

Patent

CA 2432107

Improved process for producing carboxylic acids or their esters by catalytic liquid phase oxidation of a corresponding precursor in a suitable solvent comprising feeding the reactants to a first oxidation reaction zone at high pressure and high solvent ratio, wherein uptake of oxygen is limited to less than 50 % of the oxygen required for full conversion of the precursor to its corresponding carboxylic acid, and then feeding the resulting reaction medium to a second oxidation reaction zone.

L'invention concerne un procédé amélioré destiné à produire des acides carboxyliques ou leurs esters par oxydation catalytique en phase liquide d'un précurseur correspondant dans un solvant adéquat. Le procédé consiste à injecter les réactifs dans une première zone de réaction d'oxydation à pression élevée et à rapport de solvant élevé, l'absorption d'oxygène étant limitée à moins de 50 % de l'oxygène nécessaire à la transformation complète du précurseur en son acide carboxylique correspondant, puis à injecter le milieu de réaction obtenu dans une seconde zone de réaction d'oxydation.

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