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

1989-07-20

1990-10-23

Shippen, Michael L.

Organic compounds -- part of the class 532-570 series

Organic compounds

Carboxylic acids and salts thereof

562416, C07L 51265

Patent

active

049654063

ABSTRACT:
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.sup.-, F.sup.-, Cl.sup.-, OH.sup.-, CH.sub.3 COO.sup.- or HSO.sub.4.sup.-. The benzoic acid produced is characterized by its very high purity and high conversion reaching generally values of above 95%.

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Messina, Hydrocarbon Processing, 43(11), pp. 191-192, (1964).
Hydrocarbon Processing, Nov. 1977, p. 134, Snis-Viscosa, "Benzoic Acid".
Hydrocarbon Processing, Nov. 1964, vol. 43, No. 11, pp. 191-192, Snis-Visa, "Upgrade Toluene to Benzoic Acid" by G. Messina.

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