Preparation of xylylenediamine (XDA)

US7323598B2 · 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: Jan 29, 2008
• Expiry date: Oct 22, 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 ofammoxidizing xylene to phthalonitrile by contacting the vaporous product of this ammoxidation stage directly with a liquid organic solvent (quench),removing products having a boiling point higher than phthalonitrile (high boilers) from the resulting quench solution or suspension andhydrogenating the phthalonitrile,wherein the organic solvent used for the quench is N-methyl-2-pyrrolidone (NMP), after the removal of the high boilers and before the hydrogenation, there is a partial or complete removal of the NMP and/or of products having a boiling point lower than phthalonitrile (low boilers) andthe phthalonitrile for the hydrogenation step is dissolved or suspended in an organic solvent or in liquid ammon.