Process for the manufacture of bis(4-hydroxyaryl)alkanes

Process for the manufacture of bis(4-hydroxyaryl)alkanes by heterogeneous acid-catalyzed reaction of aromatic hydroxy compounds with ketones in at least two reactors connected in series, which are operated with temperatures rising in the direction of advancing conversion, wherein the total amount of ketone is divided up over the individual reactors and is homogeneously distributed in the reaction mixture before the particular catalyst beds are entered, and wherein the reactors are operated with loading increasing in the direction of advancing conversion.