Method of selectively synthesizing triethylenediamine

US6958397B2 · kind B2 · utility

Assignee

• BASF SE

Inventors

• Matthias Frauenkron · Freinsheim, DE
• Bernd Stein · San Diego, US
• Ortmund Lang · Quirnbach, DE

Key dates

• Filing date: Jul 4, 2002
• Grant date: Oct 25, 2005
• Expiry date: Aug 13, 2022

Classification

• Technology area (CPC B): Performing Operations; Transporting
• CPC primary: B01J2229/42
• WIPO field: Organic fine chemistry
• WIPO sector: Chemistry

Abstract

The present invention describes a process for the preparation of triethylenediamine by reacting piperazine over a zeolite catalyst which, in addition to SiO2, contains an oxide of at least one further divalent, trivalent or tetravalent metal M, wherein the zeolite has a molar Si/M ratio of >100. In particular, a zeolite of the ZSM-5 type is used. The use of the zeolites permits suppression of the undesired formation of the byproduct 2-ethylpiperazine and hence considerable simplification of the working-up, in combination with high piperazine conversions and a small excess of water.