Method for reducing the content of an unsaturated amine in a mixture containing an amine and a nitrile

US6828457B2 · kind B2 · utility

Assignee

• BASF SE

Inventors

• Frank Ohlbach · Mülheim an der Ruhr, DE
• Christoph Benisch · Mannheim, DE
• Hermann Luyken · Ludwigshafen, DE
• Andreas Ansmann · Wiesloch, DE
• Rolf Fischer · Heidelberg, DE
• Johann-Peter Melder · Schifferstadt, DE
• Peter Bassler · Viernheim, DE
• Stefan Maixner · Schwetzingen, DE

Key dates

• Filing date: May 21, 2003
• Grant date: Dec 7, 2004
• Expiry date: May 21, 2023

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C07C253/34
• WIPO field: Organic fine chemistry
• WIPO sector: Chemistry

Abstract

A process is provided for reducing the content of a monounsaturated aliphatic amine (III) in a mixture (IV) containing an aminonitrile (I) or a diamine (II), or mixtures thereof, and the amine (III), whereina) the mixture (IV) is reacted with an anionic nucleophile (V), which contains a nucleophilic atom selected from the group comprising oxygen, nitrogen and sulfur, which is capable of taking up an H+ ion to form an acid with a pKa ranging from 7 to 11, measured in water at 25° C., and which has a relative nucleophilicity, measured in methyl perchlorate/methanol at 25° C., ranging from 3.4 to 4.7 when oxygen is the nucleophilic atom, ranging from 4.5 to 5.8 when nitrogen is the nucleophilic atom, and ranging from 5.5 to 6.8 when sulfur is the nucleophilic atom, in an amount ranging from 0.01 to 10 mol per mole of amine (III) in the mixture (IV), to give a mixture (VI), andb) the aminonitrile (I) or the diamine (II), or mixtures thereof, are distilled from the mixture (VI) at a temperature ranging from 50 to 170° C. and a pressure ranging from 0.5 to 100 kPa.