Process for preparing nitrogen by ammonium nitrate decomposition

Details Process for preparing nitrogen by ammonium nitrate decomposition Process for preparing nitrogen by ammonium nitrate decomposition

1981-09-14

1983-08-09

Valentine, Donald R.

Chemistry: electrical and wave energy

Processes and products

204102, 204238, 204264, 204296, 423351, C25B 100, C25B 900, C25B 1508, C01B 2100

Patent

active

043977197

ABSTRACT:
Nitrates, such as alkali metal nitrates and ammonium nitrate, are electrolytically reduced to the corresponding nitrites by a process wherein an aqueous solution containing a nitrate is supplied into a cathode chamber of an electrolytic cell including cathode and anode chambers separated by a cation exchange membrane and an electric current is applied to the electrolytic cell, while maintaining the pH of the aqueous solution at a value of at least about 4. This process can be advantageously applied not only to the manufacture of nitrites but, also, to the treatment of waste nitrates. In the treatment of waste ammonium nitrate, the ammonium nitrite so formed is conveniently further treated by subjecting the electrolytically reduced catholyte to thermal decomposition outside the electrolytic cell, and removing the so formed nitrogen and water from the reaction system.

REFERENCES:
patent: 791194 (1905-05-01), Hoopes
patent: 1359002 (1920-11-01), Thomas
patent: 2273799 (1942-02-01), Janes et al.
patent: 2601221 (1952-06-01), Rosenblatt et al.
patent: 3103473 (1963-09-01), Juda
patent: 3278403 (1966-10-01), Gardella et al.
patent: 3413203 (1968-11-01), MacLean

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