Process for the preparation of aqueous ammonium thiocyanate solutions

US5026534A · kind A · utility

Assignee

• Akzo N.V. · NL

Inventors

• Gerhard Meyer · Erlangen, DE
• Gunter Sudheimer · Darmstadt, DE
• Hans Zengel · Kleinwallstadt, DE
• Hans-Peter Grothaus · Bielefeld, DE

Key dates

• Filing date: Apr 20, 1990
• Grant date: Jun 25, 1991
• Expiry date: Apr 20, 2010

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C01C3/20
• WIPO field: Materials, metallurgy
• WIPO sector: Chemistry

Abstract

Aqueous ammonium thiocyanate solutions are prepared continuously by reaction of ammonia with carbon disulfide in the presence of water using activated carbon as catalyst at pressures of from 2 to 7 bar. In this way, a very pure product can be obtained. The process can be carried out at very low cost, because both the addition of ammonia to carbon disulfide and the decomposition of the resulting ammonium dithiocarbamate can be carried out in a reactor in one step under identical conditions.