METHOD OF PRODUCING BISPHENOL A Russian patent published in 2017 - IPC C07C37/20 C07C37/84 C07C37/72 C07C37/82 C07C39/16 C07C39/04 

FIELD: chemistry.

SUBSTANCE: method comprises: (1) a step of forming bisphenol A by condensing phenol and acetone in a reactor filled with a catalyst based on a strongly acidic cation exchange resin partially modified with a sulfur-containing amino compound, thereby producing a reaction mixture containing bisphenol A (2) a step of isolating a component with low boiling points from the reaction mixture produced in step (1), thereby producing a crystallization material containing concentrated bisphenol A, (3) a step of cooling the solidification material produced in step (2), with the crystallization of this adduct of bisphenol A and phenol to produce the crystals of adduct of bisphenol A and phenol, and to select the crystals from the reaction mixture, (4) a step of removing phenol from the adduct crystals of bisphenol A and phenol produced in step (3) to produce bisphenol A. The process also includes: (R1) a step of separating water and phenol from the phenol-containing effluent that is formed in the bisphenol A production step using methyl isobutyl ketone, followed by extraction of crude phenol, and (R2) a step of distilling and purifying crude phenol, extracted in step (R1), to produce phenol with a sulfur content of at most 0.5 ppm wt and a nitrogen content of at most 0.1 ppm wt, and phenol produced in step (R2) is re-used in, at least, one of steps (1) to (4).

EFFECT: method allows to produce bisphenol A of high quality.

10 cl, 4 ex