METHOD OF OBTAINING POLYCARBONATE ON BOUNDARY OF PHASE SEPARATION AND PROCESSING AT LEAST PART OF FORMED SOLUTION OF ALKALI METAL CHLORIDE AT ADDITIONAL STAGE OF ELECTROLYSIS Russian patent published in 2014 - IPC C08G64/24 C25B1/20 C25B1/26 C02F1/46 C02F1/461 C02F1/20 C02F1/28 

FIELD: chemistry.

SUBSTANCE: invention relates to method of obtaining polycarbonate at the boundary of phase separation and following electrolysis of sodium chloride-containing technological spent water, which includes the following stages: a) obtaining phosgene by interaction of chlorine with carbon monoxide; b) interaction of phosgene obtained at stage a) with at least one bisphenol in presence of, at least, one base, at least, one catalyst with basic character and, at least, one organic solvent with formation of polycarbonate and solution, which contains alkali metal chloride, c) separation and processing polycarbonate obtained at stage b), d) separation of solution, containing alkali metal chloride, which remains at stage c), from remains of solvent and remains of catalyst first of all by distillation with water steam and processing with adsorbents, first of all activated coal, e) electrochemical oxidation of, at least, part of stage d) solution, containing alkali metal chloride, with formation of chlorine, alkali and if necessary hydrogen, characterised by the fact that in separation of solution, realised at stage d) before its processing with adsorbents, value of solution pH is set at level 8 or lower and f) at least, part of obtained at stage e) chlorine is returned to stage a) and/or g) at least, part of obtained at stage e) alkali is returned to stage b) of polycarbonate synthesis.

EFFECT: simplification of technology, connected with possibility of supplying solution to electrolysis without purification, possibility of using components, separated from wastes, in the process.

14 cl, 4 ex