Oxygen/nitrogen production with molten alkali salts
AssigneeAir Products and Chemicals, Inc.
InventorsMichael S. Chen, Michael T. Heffelfinger
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Abstract
Method of separating oxygen or nitrogen from air using as an oxygen acceptor composition a molten solution of alkali metal salt of a cation composition of sodium and potassium cations and an anion composition of 50 to 94% nitrate, 4 to 25% nitrite and combined oxide, peroxide and superoxide wherein said oxides are present in less than 1 mol % based on sodium peroxide.
Claims6
In a continuous process for recovering oxygen or nitrogen from air comprising reacting an oxygen acceptor with air in an absorption reaction to produce a nitrogen-rich effluent, separately decomposing the oxidized acceptor to yield oxygen and regenerated oxygen acceptor and recycling the oxygen acceptor, said oxygen acceptor comprising a molten solution of alkali metal salt of a cation composition of sodium and potassium cations and an anion composition of 50 to 94% nitrate, 4 to 25% nitrite and combined peroxide, oxide and superoxide, the improvement wherein said oxides are present in less than 1 mol% based on sodium peroxide.
Dependencies are inferred from the claim text.