Abstract
This chapter presents different aspects of nitrogen isotope separation. Relatively few chemical compounds are suitable for the nitrogen isotope separation by rectification. Among these can be listed ammonia, molecular nitrogen, and nitric oxides NO and NO2 (N2O4). The separation factor values for the above operating substances are presented. The need for thorough prepurification of nitric oxide (II) is dictated by the fact that at the NO boiling point, other nitric oxides and the water contained in NO transform into solid state, which results in the clogging of equipment and upsetting of the required operational mode. The nitrogen isotope separation factor has been determined for many operating systems representing two-phase chemical exchange systems. It is found that to enhance the flow conversion completeness, efforts are made to liberate ammonia more completely from the forming MeNO3 salt solution, for which the solution is subjected to boiling. The chapter elaborates the dependence of mass-exchange characteristics on HNO3 concentration, type of packing, flow rate, and other parameters of the nitrogen isotope separation process in the Nitrox system. A comparison of nitrogen isotope separation techniques is also presented.
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