METHOD OF PRODUCING BISPHENOL A

A method of producing bisphenol A in the condensation reaction of acetone with phenol in the presence of strongly acidic, sulphonic ion-exchange resins wherein the reaction mixture containing acetone, phenol and products of the reaction between phenol and acetone is contacted with an ion-exchange catalyst in at least two reactors until the total water content is not greater than 2.5 cg/g, and acetone and phenol are fed into reactor (1) and the post-reaction mixture from reactor (1), mixed in mixer (2) with the post-crystallization liquors from crystallizers (8) and acetone, is fed into reactor (3), the post-reaction mixture after reactor (3) is mixed in mixer (4) with part of the phenol solution not greater than 40 cg/g, obtained by contacting the dewatering mixture containing at maximum 1.0% of water with anion-exchange catalyst in at least one reactor (5), the post-reaction mixture from mixer (4) is contacted in adsorber (6) at a temperature of up to 150°C and flow rate not greater than 10 m/h with a phenol solution pH stabilizer in the form of a fixed bed with grain size not greater than 1.2 mm, containing carboxyl and/or hydroxyl and/or amide groups, until the post-reaction mixture reaches a pH of 5-6 after adsorber (6), the post-reaction mixture in adsorber (6) is concentrated in distillation column(7) by partial or total evaporation of volatile substances as a distillate containing phenol, acetone and water at the boiling point under normal pressure not greater than 200°C, and bisphenol A is crystallized from the distillation residue, at least 60% of thephenol solution in reactor (5) is contacted in adsorber (9), at a temperature of up to 150°C and flow rate not greater than 10 m/h, with a phenol solution pH stabilizer in the form of a fixed bed with grain size not greater than 1.2 mm, containing carboxyl and/or hydroxyl and/or amide groups, until the mixture after adsorber (9) reaches a pH of 5-6 and the resulting solution is mixed with the distillate from distillation column (7) containing phenol, acetone and water, and fed into distillation column(10), phenol separated in column (10) is recycled to reactor (1), acetone to reactor (1) and/or (3), and the water fraction is removed from the installation as waste water. L'invention concerne un procédé de fabrication de bisphénol A dans la réaction de condensation de l'acétone avec du phénol en présence de résines échangeuses d'ions sulfoniques, fortement acides, procédé dans lequel le mélange réaction