Process for the preparation of sodium cyanide

US11053131B2 · kind B2 · utility

Assignee

• Cyplus GmbH · DE

Inventors

• Jens Henkel · Meuselbach-Schwarzmühle, DE
• Jürgen Rassbach · Arnstadt, DE
• Klaus Trenkmann · Rudolstadt, DE
• Markus Jafeld · Frechen, DE
• Bernd Glöckler · Bruchköbel, DE

Key dates

• Filing date: Jun 10, 2020
• Grant date: Jul 6, 2021
• Expiry date: Jun 10, 2040

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y02P20/129
• WIPO field: Chemical engineering
• WIPO sector: Chemistry

Abstract

The invention relates to a process for the preparation of alkali metal cyanides as a solid substance, comprising the steps of: i) an absorption step in the form of an absorption of hydrogen cyanide from a hydrogen cyanide-containing synthesis gas in an aqueous alkali metal hydroxide solution; ii) a crystallization step in the form of introducing said alkali metal cyanide solution into an evaporative crystallizer; iii) a separation step; iv) a recycle step; v) a drying step.