Method of separating electrochemically produced dinitrogen pentoxide from its solution in nitric acid

Abstract

A method of separating N.sub.2 O.sub.5 from its solution in nitric acid which comprises the steps of: (a) preparing, by the electrochemical oxidation of N.sub.2 O.sub.4 in nitric acid, a nitric acid solution at a temperature of at least 10.degree. C. containing at least 45 wt. % of dissolved (N.sub.2 O.sub.4 +N.sub.2 O.sub.5) and having a dissolved N.sub.2 O.sub.5 :nitric acid ratio by weight of at least 1:3, and (b) cooling the acid solution to less than 8.degree. C. until an N.sub.2 O.sub.5 solvate precipitates from solution. The main advantage of the invention is that it enables electrically-efficient electrochemical methods to be employed in the production of the acid solution from which the solute is recovered.

Dependencies are inferred from the claim text.