Sposób otrzymywania bisfenolu A

The subject of the invention is a two- and three-step method to obtain Bisphenol A. Bisphenol A is obtained by condensing phenol with acetone in the presence of an acidic ion-exchange resin in which part of its sulfonic groups have been neutralized with 2,2-dimethyl-l,3-thiazolidine or cysteamine, in a single reactor which is divided into three reaction zones by filtration-slot nozzles whereupon Bisphenol A is separated from the resulting post-reaction mixture by way of one- or two-step suspension-crystallization, adduct decomposition and distilling-off of phenol. In an embodiment of the invention, the resulting Bisphenol A is subjected to falling-film fractional crystallization.