Preparation of xylylenediamine (XDA)

US7368610B2 · kind B2 · utility

Assignee

• BASF SE

Inventors

• Randolf Hugo · Dirmstein, DE
• Sabine Jourdan · Mannheim, DE
• Kirsten Wenz · Mannheim, DE
• Thomas Preiss · Ludwigshafen, DE
• Alexander Weck · Freinsheim, DE

Key dates

• Filing date: Sep 4, 2004
• Grant date: May 6, 2008
• Expiry date: Oct 18, 2024

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C07C209/48
• WIPO field: Organic fine chemistry
• WIPO sector: Chemistry

Abstract

A process for preparing xylylenediamine, comprising the steps of ammoxidizing xylene to phthalonitrile 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 and before the hydrogenation, removing products having a boiling point higher than phthalonitrile (high boilers).