Journal of Korean Society of Water and Wastewater (상하수도학회지)

The Korean Society of Water and Wastewater (대한상하수도학회)
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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

미량의 NaCl을 포함하는 NH3 및 ETA 용액에서 H 및 ETAH 형 수지에 대한 이온교환 파과 특성 연구

  • 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)
  • 안현경 (순천향대학교 에너지환경공학과) ;
  • 김윤수 (순천향대학교 에너지환경공학과) ;
  • 박병기 (순천향대학교 에너지환경공학과) ;
  • 이인형 (순천향대학교 에너지환경공학과)
  • Received : 2021.12.06
  • Accepted : 2021.12.15
  • Published : 2021.12.15
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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.

전자 및 화학 산업의 초순수 생산 및 원자력 발전소의 부식 제어를 위해 이온교환 수지탑의 성능 파악이 필수적이다. 따라서 본 연구에서는 4종의 H 및 ETAH 형 양이온 교환수지가 채워진 양이온 및 혼상 이온교환수지탑에 미량의 NaCl를 포함하는 에탄올아민(ETA) 및 암모니아(NH3) 용액을 주입하여 양이온 파과특성을 조사하였다. 조사 결과, 주성분인 ETAH+ 및 NH4+와 달리, 미량성분인 Na+는 (이론적교환용량의 3배 이상) 시험기간 동안 수지탑 출구에서 파과 및 오버슈팅 현상이 나타나지 않았다. H형 수지탑의 파과현상은 ETAH+ 및 NH4+가 순서대로 일어났고, 오버슈팅은 NH4+가 파과할때 ETAH+에 대해서 발생했다. 파과영역의 너비로 결정되는 상대적 선택도는 NH4+가 ETAH+보다 최대 51.5 % 더 높았다. 유입수 Na+ 농도가 높을수록, 선택도는 감소하고 오버슈팅 현상은 증가하였다. 이온교환 수지의 고유 특성을 개선하여 감소시킬 수 있는 Na+ 누출은, ETAH형에서 높았고 4종의 양이온수지에 대해 동일하지 않은 것으로 조사되었다.

Keywords

Acknowledgement

This research was supported by Soonchunhyang University, Korea Hydro & Nuclear Power Central Research Institute (Grant No. L17S099001) and Korea Institute of Energy Technology Evaluation and Planning (Grant No. 20184030202130). The authors are thankful to Dr. Young-Jin Kim for providing the necessary advice.

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