METHOD FOR CONCENTRATION OF HEAVY NITROGEN ISOTOPE

摘要

The object of the present invention is to provide a method for concentrating effectively the heavy nitrogen isotope 15 N to 50 atom% or more. In order to achieve the object, the present invention provides a method for concentrating a heavy nitrogen isotope 15 N, in which 14 N 15 N and/or 15 N 2 , which are molecules containing a heavy nitrogen isotope of 15 N, are concentrated by distilling successively nitrogen N 2 using plural distillation columns T1 to T4 each of which comprises at least one condenser C1 to C4 and at least one reboiler R1 to R4 and is arranged in series, and a part of nitrogen in the distillation is drawn out to be subjected to isotope scrambling in an isotope scrambler S1, and nitrogen after the isotope scrambling is returned to the distillation to produce nitrogen N 2 with a 15 N concentration of 50 atom% or more.