C - Chemistry – Metallurgy – 25 – B
Patent
C - Chemistry, Metallurgy
25
B
204/65
C25B 1/00 (2006.01) C01B 21/20 (2006.01)
Patent
CA 2005663
A two-stage method of producing N2O5 in nitric acid from N2O4 in nitric acid consists of a first production stage in which the anodic oxidation of N2O4 in nitric acid and cathodic reduction of nitric acid are separated by a non-ionic or anionic ion exchange membrane, and a second production phase in which the product of the first stage anodic reaction is subjected to further anodic oxidation, the anodic and cathodic reactions being separated by a cationic ion exchange membrane. The use of a cationic membrane in the second stage promotes, through leakage of N2O4 to the catholyte, an increase in N2O5 concentration and decrease in N2O4 concentration within the anolyte acid whilst avoiding a significant loss of current effieciency. The two stages may be connected in series and operated continuously to produce a nitric acid solution containing typically 32 wt% N2O5 and less than 2 wt% N2O4.
Fetherstonhaugh & Co.
Qinetiq Limited
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