| abstract |
1. A process for the preparation of an acyloxybenzenesulfonic acid of the formula see diagramm : EP0207445,P6,F1 in which R denotes a (C1 -C17)-alkyle or (C2 -C17 )-alkenyl radical, or alkali metal, alkaline earth metal or ammonium salts thereof, employing the stages (a) sulfonation of phenol, (c) esterification of the sulfonated phenol and, if appropriate, (d) neutralization of the ester, which comprises subjecting the sulfonation intermediate product of stage (a) to heat treatment at a temperature of 50 to 110 degrees C in a stage (b) before the esterification. |