Process for producing carboxylic acids

Details Process for producing carboxylic acids Process for producing carboxylic acids

2005-09-27

2005-09-27

Tsang, Cecilia J. (Department: 1625)

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

Organic compounds

Carboxylic acids and salts thereof

C562S414000, C562S413000, C562S416000, C562S077000

Reexamination Certificate

active

06949673

ABSTRACT:
Improved process for producing aromatic carboxylic acids 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 less than that 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.

REFERENCES:
patent: 3686293 (1972-08-01), Gualdi et al.
patent: 4269805 (1981-05-01), Schoengen et al.
patent: 4593122 (1986-06-01), Hashizume et al.
patent: 5004830 (1991-04-01), Park et al.
patent: WO 98/38150 (1998-09-01), None
patent: WO 99/31038 (1999-06-01), None
patent: WO 99/59953 (1999-11-01), None

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