Process for preparing aromatic hydroxycarboxylic acids

Details Process for preparing aromatic hydroxycarboxylic acids Process for preparing aromatic hydroxycarboxylic acids

1983-03-07

1985-07-16

Killos, Paul J.

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

Organic compounds

Carboxylic acids and salts thereof

562424, 562425, C07L 5115

Patent

active

045298173

ABSTRACT:
Aromatic hydroxycarboxylic acids are prepared by reacting an alkali metal salt of an aromatic hydroxy compound in solid phase with carbon dioxide, by reacting an alkali metal salt of an aromatic hydroxy compound in the form of granules in a fluidized bed with carbon dioxide, if desired under elevated pressure, at first at temperatures of 20.degree. to 130.degree. C. until at least 40% of the hydroxy compound has been converted into the corresponding carbonate, then completing the reaction at temperatures of 135.degree. to 300.degree. C., and then converting the reaction product obtained into the free acid.

REFERENCES:
patent: 4287357 (1981-09-01), Mueller

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