Patent ID: 7368610
Filing Date: 2008-05-06
Classification: C07C

Abstract:
1. A process for preparing ortho-, meta- or para-xylylenediamine, comprising the steps of ammoxidizing ortho-, meta- or para-xylene to phthalonitrile, iso- or terephthalonitrile and hydrogenating the phthalonitrile, which comprises contacting the vaporous product of the ammoxidation stage directly with a liquid organic solvent or with molten phthalonitrile (quench), partly or fully removing components having a boiling point lower than phthalonitrile (low boilers) from the resulting quench solution or suspension or phthalonitrile melt and, after the low boiler removal or in combination with the low boiler removal and before the hydrogenation, removing products having a boiling point higher than phthalonitrile (high boilers).