Process for the purification of hydrogen cyanide

US11939281B2 · kind B2 · utility

Assignee

• Evonik Operations GmbH · DE

Inventors

• Martin Körfer · Goldbach, DE
• Michael EICKER · Moitzfeld, DE
• Catrin Becker · Frankfurt, DE
• Thorsten MERKER · Lechenich, DE
• Marko Bussmann · Bornheim, DE

Key dates

• Filing date: Jul 17, 2019
• Grant date: Mar 26, 2024
• Expiry date: Jul 25, 2041

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C07C319/28
• WIPO field: Chemical engineering
• WIPO sector: Chemistry

Abstract

The present invention relates to a process for the purification of hydrogen cyanide, comprising the steps of a) splitting a liquid feed stream (1) comprising hydrogen cyanide into at least a first liquid stream (2) and a second liquid stream (3), b) introducing the first liquid stream (2) into a distillation column (4) at a point between the top and the bottom of the distillation column, c) introducing the second liquid stream (3) into the distillation column (4) at the top of the distillation column, d) withdrawing an overhead vapor stream (5) enriched in hydrogen cyanide from the distillation column (4), and e), withdrawing a bottom stream (6) depleted in hydrogen cyanide, wherein the temperature of the second liquid stream (3) in step c) is lower than the temperature of the first liquid stream (2) in step b).