Process for the preparation of p-toluic acid by liquid phase...

Details Process for the preparation of p-toluic acid by liquid phase... Process for the preparation of p-toluic acid by liquid phase...

2006-03-17

2009-10-06

Zucker, Paul A (Department: 1621)

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

Organic compounds

Carboxylic acids and salts thereof

C562S414000

Reexamination Certificate

active

07598415

ABSTRACT:
The present invention provides a process for the preparation of p-toluic acid by liquid phase oxidation of p-xylene using oxygen or air as oxidant in the presence of p-toluic acid, water as solvent and cobalt salt or its combinations with salts of Ce, Mn as catalyst. Oxidation is carried out at 130-190° C. and pressure sufficient to keep water in liquid state. Oxidation step is followed by filteration to obtain p-toluic acid as major product. Untreated p-xylene is recovered and recycled and the catalyst is recovered from aqueous phase and is recycled.

REFERENCES:
patent: 2833816 (1958-05-01), Alfred et al.
patent: 3046305 (1962-07-01), Braunwarth
patent: 3064044 (1962-11-01), Baldwin
patent: 4259522 (1981-03-01), Hanotier
patent: 4334086 (1982-06-01), Hanotier et al.
patent: 4357475 (1982-11-01), Hanotier et al.
Sayed Akhtar H. Zaidi, “Liquid Phase Oxidation of P-xylene to P-toluic Acid,” Applied Catalysis, vol. 27, (1986) pp. 99-106, Elsevier Science Publishers B. V., Amsterdam.

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