• 펄프종이기술
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• 제36권5호
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• pp.78-84
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• 2004

Lignin precipitated from black liquor of soda pulping of bagasse was used to prepare cation-exchange resin. The effect of sulfuric acid treatment, concentration of phenol and formaldehyde on the properties of the prepared cation-exchange resin was investigated. It was found that sulfonated resinified phenolated lignin gave a resin with an ion-exchange capacity higher than that of resin, which resulted from sulfonation of resinified lignin at zero phenol concentration. Infrared spectroscopy of the prepared ion-exchange resin shows anew bands at 1060, 1160, 1280 and $1330\;cm^{-1}$ which indicated to the presence of $SO_{3}$.

• 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.

• 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.

• 공업화학
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• 제27권6호
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• pp.633-638
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• 2016

본 연구에서는 상용화된 양이온교환수지, 음이온교환수지, 혼합이온교환수지 각각 3종을 이용하여 Cs과 I 등의 방사성이온을 포함하고 있는 오염수 중 방사성 이온을 분리하는 연구를 하였다. 실험은 상온에서 회분식으로 진행하였으며, 이온교환수지의 양을 달리하여 각각의 이온교환수지에 대한 Cs와 I의 제염성능을 비교하였다. 이온크로마토그라피 기기로 농도분석을 한 결과, D사의 이온교환수지의 대체적으로 이온교환능력이 높은 결과 값을 가졌으며, 공통적으로 이온교환수지의 양이 적을 때, 이온교환수지 질량 대비 제염성능이 높은 것을 알 수 있었다. D사의 양이온교환수지의 질량이 적을 때, Cs 이온에 대한 이온교환용량은 0.199 meq/g, 음이온교환수지의 I 이온에 대한 이온교환용량은 0.344 meq/g의 결과 값을 확인할 수 있었으며, 혼합이온수지를 사용했을 때에는 I 이온에 대한 이온교환용량이 0.33 meq/g으로, D사의 이온교환수지가 다른 이온교환수지에 비해 특히 I에 대한 이온교환능력이 높은 것을 알 수 있었다.

• 멤브레인
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• 제34권2호
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• pp.132-139
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• 2024

Total dissolved solids (TDS) 제거에 이용되는 이온교환수지는 컬럼에 충진시켜 사용하게 되는데, 이온교환 과정에서 이온성 물질과 이온교환수지의 충분한 접촉시간을 필요로 한다. 본 연구에서는 이온교환수지의 분체화를 통하여 짧은 접촉시간으로도 높은 TDS 제거 성능을 보이는 이온교환수지의 특성을 연구하였다. 흐름성 등을 고려한 분체의 최적 크기는 100 ㎛ 이상임을 확인하였고, 250~500 ㎛d와 100~250 ㎛ 크기의 최대 분쇄 수율은 각각 67.3%와 36.9%였다. 또한 100~500 ㎛ 크기의 분쇄 수율은 분쇄 시간 2분에서 87.1%로 나타났다. 회분식(batch) 실험 조건에서 250~500 ㎛ 크기의 분체가 95%와 99%의 제거율에 도달하는 시간은 분쇄 전(non-pulverized) 이온교환수지에 비해 각각 1.82배와 1.96배 더 빨랐다. 100~250 ㎛ 크기의 분체는 각각 15.9배와 6.18배 더 빨랐다. 컬럼 테스트의 경우 분쇄 전 이온교환수지는 총 1.74 g, 250~500 ㎛ 크기의 분체는 1.83 g, 100~250 ㎛ 크기의 분체는 1.63 g의 NaCl을 제거하였다. 분체의 크기가 작아질수록 용량(capacity)이 약간 감소한 것으로 나타났다. 결과적으로 분체화된 이온교환수지를 사용하는 것이 접촉시간 대비 높은 TDS 제거 성능을 얻을 수 있는 방법임을 확인하였다.

• 폴리머
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• 제31권4호
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• pp.315-321
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• 2007

본 연구에서는 방사선 중합방법으로 아민화 PONF-g-GMA 이온교환 섬유를 합성하였다. 또한 핫멜트 web spray 접착방식으로 이들과 비드 수지를 결합시켜 복합 이온교환 섬유를 제조하고 이들의 바나듐 흡착특성을 확인하였다. 복합 이온교환 섬유의 이온교환 용량은 비드보다는 낮았으며, 단일 이온교환 섬유보다는 높게 나타났으며 최대 4.18 meq/g로 나타났다. 또한, 복합 이온교환 섬유의 바나듐 흡착 파과평형은 550분으로 비드 이온교환 수지보다 빠르게 진행되었고, 섬유상 이온교환체보다는 느리게 진행되었다. 한편, 바나듐의 흡착파과 시간은 pH가 낮아짐에 따라 파과가 빠르게 진행되었으며, 바나듐 농도가 증가함에 따라 흡착 평형에 도달하는 시간은 400분 전후에서 나타났다.

• 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.

• 한국재료학회지
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• 제26권9호
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• pp.498-503
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• 2016

The characteristics of aqueous lithium recovery by ion exchange were studied using three commercial cation exchange resins: CMP28 (porous type strong acid exchange resin), SCR-B (gel type strong acid exchange resin) and WK60L (porous type weak acid exchange resin). CMP28 was the most effective material for aqueous lithium recovery; its performance was even enhanced by modifying the cation with $K^+$. A comparison to $Na^+$ and $H^+$ form resins demonstrated that the performance enhancement is reciprocally related to the electronegativity of the cation form. Further kinetic and equilibrium isotherm studies with the $K^+$ form CMP28 showed that aqueous lithium recovery by ion exchange was well fitted with the pseudo-second-order rate equation and the Langmuir isotherm. The maximum ion exchange capacity of aqueous lithium recovery was found to be 14.28 mg/g and the optimal pH was in the region of 4-10.

• Membrane and Water Treatment
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• 제3권4호
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• pp.211-219
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• 2012

To enhance the efficiency of water treatment and reduce the extent of membrane fouling, the membrane separation process is frequently preceded by other physico-chemical processes. One of them might be ion exchange. The aim of this work was to compare the efficiency of natural organic matter removal achieved with various anion-exchange resins, and to verify their potential use in water treatment prior to the ultrafiltration process involving a ceramic membrane. The use of ion exchange prior to ceramic membrane ultrafiltration enhanced final water quality. The most effective was MIEX, which removed significant amounts of the VHA, SHA and CHA fractions. Separation of uncharged fractions was poor with all the resins examined. Water pretreatment involving an ion-exchange resin failed to reduce membrane fouling, which was higher than that observed in unpretreated water. This finding is to be attributed to the uncharged NOM fractions and small resin particles that persisted in the water.

• 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.