Process for the manufacture of aromatic dicarboxylic acids and d

Details Process for the manufacture of aromatic dicarboxylic acids and d Process for the manufacture of aromatic dicarboxylic acids and d

1988-11-03

1989-08-01

Lone, Werren B.

Harvesters

562416, 562417, C07C 6739, C07C 51265

Patent

active

048534790

ABSTRACT:
An improved process for the manufacture of aromatic dicarboxylic acids and derivatives thereof is described. The process is based on the reaction of a corresponding aromatic hydrocarbon 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 the 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.- and HSO.sub.4. Among the aromatic dicarboxylic acids and derivatives thereof the following are mentioned: terephthalic acid; isophthalic acid and methyl terephthalate. The process is characterized by the very high conversion of the respective aromatic hydrocarbon reaching even 100%.

REFERENCES:
patent: 4158738 (1979-06-01), Scott et al.
patent: 4281179 (1981-07-01), Komatsu et al.
patent: 4398037 (1983-08-01), Takeda et al.

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