Electrolytic conversion of nitrogen oxides to hydroxylamine and hydroxylammonium salts
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United States of America Patent
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Sep 5, 1995
Grant Date -
N/A
app pub date -
Jun 23, 1994
filing date -
Jun 23, 1994
priority date (Note) -
Expired
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Abstract
A process is described for preparing hydroxylamine and hydroxylammonium salts represented by the formulae (NH.sub.3 OH).sup.+.sub.y X.sup.-y wherein X is an anion of an acid and y is a number equal to the valence of X, said process comprising electrolytically reducing a mixture comprising at least one nitrogen oxide and either a neutral electrolyte to form hydroxylamine or an acidic electrolyte such as an organic or inorganic acid H.sub.y X to form a hydroxylammonium salt provided the acid is not perchloric acid or sulfuric acid when the nitrogen oxide is nitric oxide. More particularly, the electrolytic reduction of the present invention is conducted in an electrolysis cell comprising an anolyte compartment containing an anode, a catholyte compartment containing a cathode, and a divider separating said anolyte and catholyte compartments. The mixture of at least one nitrogen oxide and the electrolyte is present in the catholyte compartment, and an acid is present in the anolyte compartment. The present invention provides an electrolytic process for preparing hydroxylamine and hydroxylammonium salts containing reduced amounts of ammonium products, the process consumes a reduced amount of electric energy when compared to nitric acid reduction and does not require a mercury cathode.
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