METHOD OF BISPHENOL-A PURIFICATION Russian patent published in 2008 - IPC C07C37/84 C07C39/16 

FIELD: chemistry.

SUBSTANCE: method involves two stages: a) cooling of a liquid mixture containing bisphenol-A and water in a bisphenol-A chiller with bisphenol crystals formation in the liquid phase; b) separation of bisphenol-A crystals from the liquid phase; c) at least, partial separation the liquid phase into bisphenol-rich organic phase and water-rich phase; d) feeding of phenol and at least a part of the bisphenol-rich organic phase to the adduct followed by formation of phenol and bisphenol-A crystal adduct in a mother solution; e) separation of crystal adduct from the mother solution; g) contact of at least a part of the mother solution obtained at the stage e) with a catalyst of isomerisation of bisphenol-A isomers into bisphenol-A; and h) recycling of at least a part of the mother solution processed at the stage g) through the stage d).

EFFECT: improved purity and output of the composition.

12 cl, 2 dwg, 1 ex