Process for the preparation of aromatic hydroxycarboxylic acids

Details Process for the preparation of aromatic hydroxycarboxylic acids Process for the preparation of aromatic hydroxycarboxylic acids

C - Chemistry, Metallurgy

07

C

260/318, 260/513

C07C 65/01 (2006.01) C07C 51/15 (2006.01) C07D 209/88 (2006.01)

Patent

CA 1194490

Abstract Aromatic hydroxycarboxylic acids are prepared by reacting alkali metal salts of aromatic hydroxy compounds in the solid phase with carbon dioxide in a process in which the alkali metal slat of the aromatic hydroxy com- ound is reacted at temperatures of 120 to 300°C, in the form of granules, in a fluidized bed with carbon dioxide, if appropriate under elevated pressure and, if appro- priate, in the presence of the aromatic hydroxy compound in the form of vapour, with continuous removal, by means of excess carbon dixoide, of the aromatic hydroxy compound which is formed, until at least 40% of the hydroxy com- pound have been converted into the alkali metal salt at the corresponding hydroxycarboxylic acid, and, if appro- priate, the resulting alkali metal slat of the hydroxy- carboxylic acid is reacted further in a subsequent stage at temperatures of 150 to 300°C and under elevated pressure, in the presence of carbon dioxide, with the aromatic hydroxy compound formed, and the resulting re- action product is then converted in a customary manner into the free acid.

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