Method for purifying hydrocyanic acid

US7462263B2 · kind B2 · utility

Inventors

• Michael Bartsch · Neustadt, DE
• Robert Baumann · Mannheim, DE
• Gerd Haderlein · Bad Kötzting, DE
• Miquel Angel Flores · Aranjuez, ES
• Tim Jungkamp · Sandhausen, DE
• Hermann Luyken · Ludwigshafen, DE
• Jens Scheidel · Hirschberg, DE
• Wolfgang Siegel · Schifferstadt, DE
• Dagmar Pascale Kunsmann-Keitel · Ludwigshafen am Rhein, DE
• Peter Bassler · Viernheim, DE

Key dates

• Filing date: Apr 15, 2004
• Grant date: Dec 9, 2008
• Expiry date: Nov 17, 2025

Classification

• Technology area (CPC B): Performing Operations; Transporting
• CPC primary: B01J2219/0011
• WIPO field: Organic fine chemistry
• WIPO sector: Chemistry

Abstract

A process for dewatering hydrocyanic acid by distillation, which includes distilling crude hydrocyanic acid containing from 50 to 99.9% by weight of HCN, from 0.1 to 40% by weight of water, from 0 to 15% by weight of carbon oxides and optionally from 0.01 to 1% by weight of an involatile stabilizer, at a pressure of from 1 bar to 2.5 bar, a bottom temperature of from 100° C. to 130° C. and a top temperature of from 25° C. to 54° C., in the absence of a volatile stabilizer, in a distillation column to obtain a top draw stream containing purified, anhydrous hydrocyanic acid and carbon oxides and a bottom draw stream including water and, optionally, the involatile stabilizer.