Method for recovering guanidine salts

US5938907A · kind A · utility

Assignee

• NIGU Chemie GmbH · DE

Inventors

• Erwin Kiesewetter · Stolberg, DE
• Klaus-Peter Stengele · Pleiskirchen, DE

Key dates

• Filing date: Aug 20, 1996
• Grant date: Aug 17, 1999
• Expiry date: Aug 20, 2016

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C07C279/02
• WIPO field: Chemical engineering
• WIPO sector: Chemistry

Abstract

A process for recovering guanidine salts from diluted and contaminated aqueous solutions is described, wherein the corresponding aqueous solution (diluate) is subjected to electrodialysis and the guanidine salt is concentrated on the concentrate side. The corresponding guanidine salt can thus largely be separated from all contaminants while a relatively highly concentrated product is simultaneously obtained.