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Topic: how phenol is forming in polycarbonate separation stream  (Read 3769 times)

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Offline raja

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how phenol is forming in polycarbonate separation stream
« on: August 22, 2007, 04:49:36 AM »
We are commissioning our plant for production of polycarbonate. After synthesis and separation poymer stream with solvent goes to solvent separation units which have composition pc=23.128%,cb=73.574%,mc=3.234%,water=0.008% where pc=polycarbonate,cb=chlorobenzene,mc=methylene chloride.This stream is at temperature 127°C goes to 1st solvent evaporator where it is heated up to 220°C,resulting product stream contains pc=64% and cb=rest which goes to 2nd solvent separator which is at temperature 260°C. Bottom product stream from 2nd solvent separator contains pc=85% and cb=15%, but in top product we have observed phenol, for which we could not find the reason.Kindly explain the possibilities.

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