Continuous Isotope Separation in Systems with Solid Phase. II. Separation of Nitrogen Isotopes with Use of Ion-Exchange Resin

Kruglov, Alexey V.; Andreev, B. M.; Pojidaev, Ygor E.

doi:10.1080/01496399608002211

Cited by 14 publications

(6 citation statements)

References 14 publications

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“…However, it is confirmed in Fig. 5 that the HETPs obtained at a longer migration distance are almost constant (0.49 mm) for migrations up to 60 m. We have surveyed previously reported 15 N ion-exchange enrichment systems, and the HETPs reported by Spedding (3), Park (4), and Kruglov (5), and the calculated HETP based on the data in the work of Urgell (8) are summarized in Table 1 along with the HETPs obtained in the present work and in our previous work (6). Spedding (3), Park (4), and Urgell (8) used gel-type resins; Kruglov (5) used a macroreticular resin; and a highly crosslinked, highly porous microreticular resin was used in our previous work (6).…”

Section: Hetpsupporting

confidence: 65%

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Nitrogen Isotope Separation Using Porous Microreticular Cation-Exchange Resin

Ohwaki¹,

Fujii²,

Morita³

et al. 1998

Separation Science and Technology

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A long-distance chromatographic operation was carried out in order to study the isotope accumulation of I5 N in the ion-exchange enrichment process by using a porous microreticular cation-exchange resin. Combined bands of ammonium and lithium ions were eluted up to 20 m, and thereafter the ammonium band was eluted up to a total migration distance of 60 m. The constant lengths of the adsorbed bands were maintained throughout the elution, and a sharp boundary at the rear end of the ammonium band was monitored by an electric conductivity meter. The enrichment of both 15 N at the rear end of the ammonium band and 6 Li at the rear end of the lithium band were confirmed in the experiment. The values of HETP in the system were kept almost constant, 0.49 mm, throughout the migration up to a distance of 60 m. Previously reported works on the same process are analyzed, and an empirical relation for HETP in terms of resin diameter and band velocity has been obtained as HETP = c(d p u B ) 0M .

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Section: Hetpsupporting

confidence: 65%

“…A rapid exchange rate was observed in this work. In the recent years, Kruglov et al (5) studied this system using the SMB (simulated moving bed) process for various flow rates under total reflux. In addition, they also carried out a continuous feed operation in order to estimate the separative efficiency of the system.…”

Section: Introductionmentioning

confidence: 99%

Nitrogen Isotope Separation Using Porous Microreticular Cation-Exchange Resin

Ohwaki¹,

Fujii²,

Morita³

et al. 1998

Separation Science and Technology

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“…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.…”

Section: Introductionmentioning

confidence: 99%

Effects of Cross Linking on the Chromatographic Nitrogen Isotope Separation

Liu¹,

Ding²,

Suzuki³

et al. 2011

AJAC

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The effects of cross linking with porous cation exchange resin were studied for nitrogen isotope separation. The displacement chromatography was conducted by the resin with cross linking rang from 20% to 40%. A sharp adsorbed ammonium band was maintained for each operation. Enriched 15 N isotopes with 0.93% were obtained by 20% cross linking resin and two meters chromatographic operation which started from the natural abundance of ammonium molecule. The effect of cross linking percentage on the height equivalent to a theoretical plate (HETP) was evaluated in the present work and the HETP value is proportional to the cross linking percentage. HETP value of 0.036 cm was obtained at the present system by using 20% cross linking resin.

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“…Afterwards, in 1980s, Park and Michaels studied the separation process developed by Spedding et al under various operating conditions using columns packed with sulfonated polystyrene-divinylbenzene copolymers [30]. In the recent years, Krugrov et al studied NH3-NH4 + system using SMB (simulated moving bed) process for various flow rates under total reflux [31] and the theoretical analysis of separating nitrogen isotopes by ion exchange was reported by Aoki et al [32].…”

Section: No H No No H Nomentioning

confidence: 99%