METHOD OF PRODUCING HIGH-PURITY BISPHENOL A AND PRODUCTION APPARATUS Russian patent published in 2011 - IPC C07C37/82 C07C37/20 C07C37/86 C07C39/16 B01J8/04 B01D9/02 

FIELD: chemistry.

SUBSTANCE: invention relates to versions of a method of producing bisphenol A, one of which comprises a step for removing free acid using a resin selected from strongly acidic ion-exchange resin, strongly basic ion-exchange resin, weakly basic ion-exchange resin and mixture thereof, at the next step (D) in order to remove the remove free acid contained in the mother liquid or isomerised liquid, wherein the method of producing bisphenol A involves: a condensation reaction step (A), on which excess amount of phenol reacts with acetone in the presence of an acid catalyst; a concentration step (B) on which the reaction mixture obtained at step (A) is concentrated; a step for crystallisation or separation of the solid phase and liquid phase (C) on which the adduct of bisphenol A and phenol is crystallised by cooling the concentrated reaction mixture obtained at step (B), and that adduct is separated from the mother liquid; an isomerisation step (D) on which the entire mother liquid obtained at step (C) is isomerised using an isomerisation catalyst and the obtained isomerised liquid is returned to step (A) and/or step (B); a step for decomposition of the adduct (F), on which molten bisphenol A is obtained by removing phenol from the adduct of bisphenol A and phenol obtained at step (C); and a granulation step (G) on which a granular product is obtained by granulating the bisphehol A melt obtained at step (F). The invention also relates to versions of apparatus for implementing the said method.

EFFECT: high efficiency of the method.

10 cl, 4 ex, 1 dwg