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http://dx.doi.org/10.11001/jksww.2021.35.6.533

A study on breakthrough characteristics of ion exchange bed with H- and ETAH-form resins for cation exchange in NH3 and ETA solution including trace NaCl  

Ahn, Hyun-Kyoung (Department of Energy & Environmental Engineering, Soonchunhyang University)
Kim, Youn-Su (Department of Energy & Environmental Engineering, Soonchunhyang University)
Park, Byung-Gi (Department of Energy & Environmental Engineering, Soonchunhyang University)
Rhee, In-Hyoung (Department of Energy & Environmental Engineering, Soonchunhyang University)
Publication Information
Journal of Korean Society of Water and Wastewater / v.35, no.6, 2021 , pp. 533-544 More about this Journal
Abstract
Ion exchange (IX) performance on the exchanger bed is essentially evaluated for the generation of ultrapure water in electronics and chemical industries and for the corrosion control in nuclear power plants. The breakthrough characteristics of IX bed with multi-component were investigated with both cation- and mixed-IX beds of H- and ETAH-form for four kinds of cation exchange resins by using the combined solution of ethanolamine (ETA) and ammonia (NH3) at trace NaCl. Unlike major components (ETAH+ and NH4+ ), the phenomena of breakthrough and overshooting at bed outlet were not observed by Na+ over the test period (> 3 times theoretical exchange capacity of IX bed). The breakthrough from H-form resin bed was sequentially reached by ETAH+ and NH4+, while the overshooting was observed for ETAH+ at the breakthrough of NH4+. NH4+ was 51.5% higher than ETAH+ in terms of the relative selectivity determined with the width of breakthrough zone. At the increased concentration of Na+ at bed inlet, the selectivity and the overshooting were decreased and increased, respectively. Na+ leakage was higher from ETAH-form resin bed and was not identical for four kinds of cation-exchange resins, which may be reduced by improving the intrinsic property of IX resin.
Keywords
Ion exchange; Selectivity; Breakthrough; Overshooting; Ion exchange zon;
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