Method for obtaining hexamethylene diamine from mixtures containing hexamethylene diamine

US6139693A · kind A · utility

Assignee

• BASF Aktiengesellschaft Ludwigshafen · DE

Inventors

• Peter Bassler · Viernheim, DE
• Rolf Fischer · Heidelberg, DE
• Hermann Luyken · Ludwigshafen, DE
• Alwin Rehfinger · Mutterstadt, DE
• Guido Voit · Freinsheim, DE

Key dates

• Filing date: Aug 9, 1999
• Grant date: Oct 31, 2000
• Expiry date: Aug 9, 2019

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y10S203/20
• WIPO field: Organic fine chemistry
• WIPO sector: Chemistry

Abstract

A process for recovering hexamethylenediamine (I) from a mixture (II) including PA1 (I) hexamethylenediamine, PA1 (III) hexamethyleneimine, PA1 (IV) a compound selected from 2-aminomethylcyclopentylamine and 1,2-diaminocyclohexane, PA1 (V) an imine, PA1 (VI) adiponitrile and 6-aminocapronitrile includes distilling PA1 (a) a mixture (II) to obtain PA2 (a1) a low boiling fraction (III), PA2 (a2) a medium boiling fraction (VII) (I), (IV) and (V), and PA2 (a3) a high boiling fraction (V) and (VI), PA1 (b) a mixture (VII) to obtain PA2 (b1) an overhead product (IV), and PA2 (b2) a mixture (VIII) (I) and (V) as bottom product, and PA1 (c) a mixture (VIII) to obtain PA2 (c1) (I) as overhead product, and PA2 (c2) a bottom product (V).