Progress of Cryogenics and Isotopes Separation , ISSN: 1582-2575
2016, Volume 19, Issue 2

Simultaneous Separation of 15N and 14N by Isotopic Exchange in Nitrox System at Pressure

Damian Axente * , Ancuţa Balla , Cristina Marcu , Ştefan Gergely

National Institute for Research and Development of Isotopic and Molecular Technologies, 67-103 Donat Str. 400293 Cluj-Napoca, Romania

*Corresponding author: Damian Axente, E-mail:

Published: October 2016


A new experimental study on simultaneous separation of 15N and 14N by 15N/14N exchange in Nitrox system under pressure is presented. The influence of the 10M HNO3 flow rate and of the pressure on the isotopic separation was measured on a packed column equipped with product and waste refluxer. The experimental data show that the separation of 15N and 14N is improved by column operation at pressure. By using the additional column section in the top of waste refluxer all nitrogen oxides were converted into nitric acid and NOx losses, in the top of isotopic separation plant, were not more observed. The pressure in the 0.6- 1.6 atm range of the sulfur dioxide, feeding the product refluxer, can be utilized providing similar results for 15N, 14N separation for 3.14 10M HNO3 mL/cm2·min flow rate in the packed separation column.


15N, 14N separation, isotopic exchange, Nitrox system, pressure, packed separation column.

Tag search 15N 14N separation isotopic exchange Nitrox system pressure packed separation column