| abstract |
The present invention relates to a process for obtaining pure, substantially water-insoluble esters of alpha, beta-ethylenically unsaturated carboxylic acids from mixtures which are contaminated with unreacted carboxylic acid and / or a catalyst containing acid groups and, if appropriate, with at least one further additive, DOLLAR A a ) the mixtures for the greatest possible removal of the impurities used as the organic phase in a liquid-liquid extraction against an aqueous phase, DOLLAR A b) the aqueous base with the impurities contained therein, DOLLAR A which is characterized in that the Extraction adds an aqueous base to the mixture and the liquid-liquid extraction takes place in one step. |