• 한국산학기술학회논문지
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• 제7권4호
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• pp.727-732
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• 2006

본 연구에서는 전해질 성분 및 농도, 이온교환 수지 조성비율을 통해 이온교환 수지탑의 성능을 평가하고, 이온교환 수지에 의한 입자성 물질 제거의 능력과 입자성 물질이 이온교환 특성에 미치는 영향을 조사하였다. 이온교환 수지탑 배열 순서에 따라 파과(돌파)시점이 연장되며, 파과(돌파)순서는 음이온의 경우 $Cl^{-}, 양이온의 경우 $Na^{+} 순 이였으며, 전해질의 농도가 증가할수록 파과시간이 단축되었다. 이온교환 수지의 조성비 변화에서는 양음이온교환 수지 조성비가 1:2의 경우 1:1및 1:3의 경우보다 파과(돌파)시간이 연장되었으며 동일한 전해질 농도에서 입자 농도가 증가하면 20% 미만으로 파과(돌파)시간이 단축되었다. 양이온 교환수지 비율이 높으면 양이온의 파과(돌파)시점이 늦어져 이온교환 수지탑의 수명이 연장되고, 입자성 물질은 전해질 농도와 무관하게 이온교환 수지의 세공을 막아 이온교환 용량을 감소시켜 파과(돌파)시간을 단축시키는 것으로 조사되었다.

• 한국환경과학회지
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• 제9권4호
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• pp.319-323
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• 2000

Nitrate-selective ion exchange resin which have bulky tertiary amine as functional group have been synthesized by the reaction of chloromethylated polystyrene-divinylbenzene copolymer and the corresponding tertiary amine [$NR_3=NE_{t3} 1, N{(C_2 H_4 H_3)}_32]$in ethanol, while commercial resin has $NMe_3$ as functional group. The fundamental properties such as bulk density, water content, appearance index, exchange capacity, effective size, uniformity coefficient of synthesized anion exchange resin (1) have been measured. The ion exchange resin (1) and (2) exhibited the better selectivity for nitrate than sulfate in both batch and continuous column experiments.

• 환경위생공학
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• 제23권1호
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• pp.67-72
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• 2008

Ion exchange performance to remove Ammonium in water was studied using commercially available strong acidic cationic exchange resin of $Na^+$ type in the batch and continuous column reactors. The performance was tested using the effluent concentration histories for continuous column or equilibrium concentrations for batch reactor as a function of time until resins were exhausted or reached ionic equilibrium between resin and solution. The results shoed that cationic exchange resin used in this study was more effective than activated carbon or zeolite for ammonium removal. Ammonium removal with the ion exchange resin temperature to be high qualitative recording minuteness but increases about seasonal change of temperature was judged with the public law where the adaptability is excellent. When the pH comes to be high at 11 degree, the ammonium was not effectively removed.

• 한국물환경학회지
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• 제29권6호
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• pp.777-781
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• 2013

Ion-exchange technology is one of the best for removing nitrate from drinking water. However, problems related to the disposal of spent brine from regeneration of exhausted resins must be overcome so that ion exchange can be applied more widely and economically, especially in small communities. In this background, a combined bio-regeneration and ion-exchange system was operated in order to prove that nitrate-laden resins could be bio-regenerated through direct contact with denitrifying bacteria. A nitrate-selective A520E resin was successfully regenerated by denitrifying bacteria. The bio-regeneration efficiency of nitrate-laden resins increased with the amount of flow passed through the ion-exchange column. When the fully exhausted resin was bio-regenerated for 5 days at the flowrate of 30 BV/hr and MLSS concentration of $125{\pm}25mg/L$, 97.5% of ion-exchange capacity was recovered. Measurement of nitrate concentrations in the column effluents also revealed that less than 5% of nitrate was eluted from the resin during 5 days of bio-regeneration. This result indicates that the main mechanism of bio-regeneration is the direct reduction of nitrate by denitrifying bacteria on the resin.

• 대한화학회지
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• 제11권2호
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• pp.56-59
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• 1967

Ligand Exchange를 원리로 하여 Nickel Ion을 포함하고 있는 Chelating Resin인 dowex A-1을 써서 Elution Chromatography에 의하여 Amine의 혼합물을 분리하는 방법을 기술하였다. 이 실험에서 암모니아 수용액을 Eluent로 썼다. 이 방법은 특히 방향족아민의 분리에 효과 있음을 알게 되었다.

• 대한화학회지
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• 제3권1호
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• pp.18-22
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• 1954

The cation exchange resins are synthesized from p-phenolsulfonic acid, formalin, and sodium hydroxide catalyser, and the ion exchange properties of them are studied with respect to their reactant ratios. Maximum exchange capacity was 2.06 me/G, much smaller than the theoretical value of 3.42 me/G to be expected for that of the structure: Under the present experimental conditions, much -SO3H radical should have been split away.

• Journal of Pharmaceutical Investigation
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• 제27권4호
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• pp.313-321
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• 1997

Ion exchange resin complexes of famotidine have been prepared by the reaction of famotidine solution with activated ion exchange resins. Complex formation efficiency between famotidine and ion exchange resin was about $80{\sim}90%$ in average, calculated by HPLC determination. Drug release characteristics from the resin complexes were evaluated by the modified percolation method. Famotidine release was dependent on the type of ion exchange resins. In the case of weakly acidic resin complexes, the cumulative released amount of famotidine was more than 90% for 1hr in pH 1.2 buffer solution. However, in the case of strongly acidic resin complexes, it was less than 5% for 3hr in the same medium. Strongly acidic resins revealed some advantages over weakly, acidic resins for overcoming instability of famotidine in gastric juice. In addition, strongly acidic resin complexes showed controlled release of famotidine in pH 6.8 buffer solution, showing the result of about 60 to 70% of drug release for 5hr. After oral administrations of famotidine-resin complexes to rats as dose of 40 mg equivalent/kg, the pharmacokinetic parameters of famotidine were obtained by model independent analysis and compared with those of famotidine solution or suspension. $C_{max}$ of famotidine-resin complex was lower than that of famotidine solution or suspension. MRT, MAT, and MDT of the complexes were greater than those of famotidine solution or suspension. From these results, it was expected that famotidine was released slowly from the complexes and absorbed continuously into systemic circulation. It was recognized that drug release from the complexes was the rate-limiting step in drug absorption, since there were close correlations between in vitro drug release and in vivo pharmacokinetic parameters.

• Nuclear Engineering and Technology
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• 제55권2호
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• pp.640-647
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• 2023

Material corrosion in nuclear power plant (NPP) is not controlled only by amine injection but also by ion exchange (IX) which is the best option to remove trace Na⁺. This study was conducted to understand the Na⁺ leakage characteristics of IX beds packed with ethanolamine-form (ETAH-form) and hydrogen-form (H-form) resins in the simulated water-steam cycle in terms of intrinsic behaviors of four kinds of cation-exchange resins through ASTM test and Vanselow mass action modeling. Na⁺ was inappreciably escaped throughout the channel created in resin layer. Na⁺ leakage from IX bed was non-linearly raised because of its decreasing selectivity with increasing Na⁺ capture and with increasing the fraction of ETAH-form resin. Na⁺ did not reach the breakthrough earlier than ETAH⁺ and NH₄⁺ due to the increased selectivity of Na⁺ to the cation-exchange resin (H⁺ < ETAH⁺ < NH₄⁺ ≪ Na⁺) at the feed composition. Na⁺ leakage from the resin bed filled with small particles was decreased due to the enhanced dynamic IX processes, regardless of its low selectivity. Thus, the particle size is a predominant factor among intrinsic properties of IX resin to reduce Na⁺ leakage from the condensate polishing plant (CPP) in NPPs.

• 한국산학기술학회논문지
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• 제3권2호
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• pp.141-145
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• 2002

이온교환수지탑으로 유입된 이온은 연속적인 이온교환 평형을 이루면서 수지층을 통과한다는 가정하에 질량작용법칙과 몰 균형식을 조합하여 연속이은교환평형 칼럼모델을 개발하였다. 연속이온교환평형 칼럼모델을 이용하여 원자력발전소 복수탈염설비 탈염기의 성능을 평가한 결과, Na/sup +/및 Cl/sup -/누출 농도는 수지의 재생효율에 따라 다르며, 특정이온의 유입수 및 유출수에서 농도 비율은 용액 및 수지의 상태에 따라 달라짐을 확인하였다. 본 모델은 수지농도를 보정하여 국부 불완전 평형을 고려할 수 있고, 다성분 존재하의 경쟁적 이온교환을 묘사할 수 있는 장점을 가지고 있다.

• 생명과학회지
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• 제7권2호
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• pp.73-78
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• 1997

시판되고 있는 강염기성 $Cl^{-}$형의 음이온 교환수지를 사용하여 회분식 질산성 질소 제거 실험을 행하여 다음과 같은 결과를 얻었다. 수지의 종류에 따라 제거특성은 달랐다. 수지의 량이 많을수록, 계의 온도가 톡을 수록 질산성 질소이 제거효율은 높아졌다. 원수의 농도는 낮을수로그 원수의 공급유속은 느릴수록 질산성 질소의 제거효율이 좋았다. 음이온에 디한 겔형 이온교환수지인 SA 10A의 선택성은 ${SO_4}^{2-}>{No_3}^->NO_{2-}>{HCO_3}^-$로써 이온가 수가 높은 이온일수록 선택성이 증가하고 은 이온가인 경우에는 원자번호가 클수록 그리고 수화반경이 작을수록 선택성이 증가하였다. 증가하였다.