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Large-scale production of anhydrous nitric acid and nitric acid solutions of dinitrogen pentoxide

United States Patent

March 13, 2001
View the Complete Patent at the US Patent & Trademark Office
Lawrence Livermore National Laboratory - Visit the Industrial Partnerships Office Website
A method and apparatus are disclosed for a large scale, electrochemical production of anhydrous nitric acid and N.sub.2 O.sub.5. The method includes oxidizing a solution of N.sub.2 O.sub.4 /aqueous-HNO.sub.3 at the anode, while reducing aqueous HNO.sub.3 at the cathode, in a flow electrolyzer constructed of special materials. N.sub.2 O.sub.4 is produced at the cathode and may be separated and recycled as a feedstock for use in the anolyte. The process is controlled by regulating the electrolysis current until the desired products are obtained. The chemical compositions of the anolyte and catholyte are monitored by measurement of the solution density and the concentrations of N.sub.2 O.sub.4.
Harrar; Jackson E. (Castro Valley, CA), Quong; Roland (Oakland, CA), Rigdon; Lester P. (Livermore, CA), McGuire; Raymond R. (Brentwood, CA)
The United States of America as represented by the Department of Energy (Washington, DC)
07/ 050,168
April 13, 1987
The United States Government has rights in this invention pursuant to Contract No. W-7405-ENG-48 between the U.S. Department of Energy and the University of California, for the operation of Lawrence Livermore National Laboratory.