Process for oxidizing hydrocyanic acid to cyanogen

Abstract

Dicyan is produced by reacting hydrocyanic acid with oxygen or oxygen-containing inert gas in an aqueous solution of copper nitrate or copper nitrate and one or more nitrates of alkali metals, alkaline earth metals or aluminum at a pH of from -0.5 to 1.5. Almost all the small quantity of nitrogen oxides by-produced in the reaction can be removed by absorbing them in the catalyst solution in which the reaction is terminated or retarded and the resulting solution can be reused by recycling.

Dependencies are inferred from the claim text.