High enrichment of 15N by chromatographic chemical process

Effects of Cross Linking on the Chromatographic Nitrogen Isotope Separation

“…Ohwaki et al reported nitrogen isotope separation by using HITEC-H1 cation exchange resin (porous strong acid type, cross linking 30%, particle size 37 -77 um) and the value of HETP was 0.019 cm [7,14]. In our previous work [8][9][10], SQS-6 resin (8% cross linking, particle size 60 -80 um) was applied to nitrogen isotope separation and the value of HETP was 0.02 cm. Comparing with above mentioned HITEC-H1 and SQS-6 resin, the present resin has quite large HETPs.…”

“…Since high cross linking means low exchange capacity, it is reasonable that the 15 N enrichment percentage is reduced with the increase of cross linking at the same given migration distances. SQS-6 resin was the commercial resin and with 8% cross linking which used in References [8][9][10], 15 N enrichment percentage was 1.56% when SQS-6 resin was performed under the same condition, and low cross linking resin has much higher enrichment ability than high cross linking resin.…”

“…Separation and concentration of a stable isotope from an isotopic mixture with natural occurrence is a very complex problem and usually, the isotopic separation coefficients of natural abundance are very low. Recently, many studies have been focused on nitrogen isotope separation [5][6][7][8][9][10] and chemical exchange method in isotope separation had been proved to be the most promising method for light element isotope separation since firstly performed by Spedding et al [11]. In this process, strong acidic cation exchange resin was packed in colums and ammonium ions were adsorbed in resin phase.…”

Nitrogen Isotope Separation by Ion Exchange Chromatography

“…In addition, many other publications reported the 15 N application in agroecological system [13][14][15][16][17]. In the industrial application, growing attention has been recently placed on the use of 15 N isotope for the nitride fuels of FBRs (Fast Breeders Reactors) because of their desirable properties of large thermal conductivities and large breeding ratio [18][19][20].…”