Process for the manufacture of benzoic acid and salts thereof

Details Process for the manufacture of benzoic acid and salts thereof Process for the manufacture of benzoic acid and salts thereof

C - Chemistry, Metallurgy

07

C

260/513.8

C07C 51/255 (2006.01) C07C 51/265 (2006.01) C07C 63/06 (2006.01)

Patent

CA 1310977

ABSTRACT OF THE DISCLOSURE A process for the manufacture of benzoic acid is described. The process is based on the reaction of toluene in a liquid phase oxidation with an oxygen containing gas in the presence of a phase-transfer catalyst (a), a transition metal salt (b) and traces of a polar solvent, such as water, the molar ratio between (a) and (b) being in the range of between 0.25:1 to 1.5:1 The phase-transfer catalyst is selected from quaternary ammonium and phosphonium salts having a total carbon atoms in the range of 17 to 58, the anion bound thereto being selected from Br-, F-, Cl-, OH-, CH3COO- or HSO4-. The benzoic acid produced is characterized by its very high purity and high conversion reaching generally values of above 95%.

572870

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