Method and apparatus for synthesizing anhydrous HNO.sub.3

Details Method and apparatus for synthesizing anhydrous HNO.sub.3 Method and apparatus for synthesizing anhydrous HNO.sub.3

1982-07-20

1984-04-17

Andrews, R. L.

Chemistry: electrical and wave energy

Processes and products

Electrostatic field or electrical discharge

204101, 204262, 204268, C25B 100, C25B 904

Patent

active

044433085

ABSTRACT:
A method and apparatus for electrochemically synthesizing anhydrous HNO.sub.3 from an aqueous solution of HNO.sub.3 includes oxidizing a solution of N.sub.2 O.sub.4 /aqueous HNO.sub.3 at an anode, while maintaining a controlled potential between the N.sub.2 O.sub.4 /aqueous HNO.sub.3 solution and the anode. A potential of about 1.80V vs. SCE is preferred. Anhydrous or aqueous HNO.sub.3 may be disposed at the cathode within the electrochemical cell. Aqueous HNO.sub.3 having a water content of up to about 12% by weight is utilized to synthesize anhydrous HNO.sub.3.

REFERENCES:
patent: 887266 (1908-05-01), Pauling
patent: 1008383 (1911-11-01), Sparre
patent: 3926953 (1975-12-01), Coburn et al.
patent: 4289591 (1981-09-01), Davidson et al.
"Electrochem. Prep. of N.sub.2 O.sub.5 " by J. Zawadski et al., Roczniki Chemii 22, (1948), pp. 233-247.

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