• Title, Summary, Keyword: 에탄올아민

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Sludge Deposit in SG and Ionic Impurity Removal (증기발생기에서 슬러지 침전과 이온성 불순물 제거)

  • Kim Sang Dae;Ahn Hyun Kyoung;Rhee In Hyoung
    • Proceedings of the KAIS Fall Conference
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    • pp.258-260
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    • 2004
  • 암모니아 대신 에탄올아민은 원자력 발전소 2차계통수에서 pH를 증가시켜 철 부식을 억제하고, 중기 발생기 전열관의 건전성을 제고하기 위해 사용하고 있다. 에탄올아민은 암모니아와 물리화학적 성질이 다르므로, 증기발생기에 유입되는 부식생성물의 용해와 흡착, 이온성 불순물의 잠복현상에 미치는 영향이 다르다. 본 연구에서는 온도가 증가함에 따라 암모니아와 에탄올아민이 부식생성물에 대한 용해와 흡착, 이온성 불순물의 잠복현상에 미치는 영향을 조사하였다. 2차 계통수의 pH 제어제로서 에탄올 아민은 암모니아보다 증기발생기 슬러지의 철산화물에 많이 흡착되어 철산화물의 용해도를 증가시키므로 퇴적된 슬러지의 양을 감소시키며, 또한 슬러지에 흡착된 불순물의 양을 감소시켜 잠복 현상을 억제할 것으로 판단된다.

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A Study on Characteristics of pH Control with Amines in the Secondary Side of Nuclear Power Plants (원전 2차 계통에서 아민의 pH 제어 특성 연구)

  • Rhee, In-H.;Ahn, Hyun-Kyoung;Park, Byung-Gi;Jun, Gwon-Hyuk;Ho, Song-Chan
    • Journal of the Korea Academia-Industrial cooperation Society
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    • v.11 no.8
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    • pp.3112-3118
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    • 2010
  • The pH control agent in PWRs, to insure the integrity of steam generator, was changed from ammonia to ethanolamine(ETA) which decreased pH at condensate system and low pressure feedwater heater drain system, so that several amines were investigated for the selection of the optimum amine. There was no single alternative amine to meet the optimum condition. The more volatile ammonia provides the higher pH in condensate, while the less volatile ETA increases the pH in wet steam area. Thus, the combined amine of ammonia and ETA is able to equally raise the pH in both region so that the flow accelerated corrosion be reduced in the every system of the secondary side and the integrity of steam generator be also improved in pressurized water reactors (PWRs).

Effect of Temperature on Dissolution and Adsorption of Iron Oxide (온도 변화에 따른 철산화물의 용해 및 흡착 특성)

  • 안현경;이인형
    • Journal of the Korea Academia-Industrial cooperation Society
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    • v.3 no.3
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    • pp.198-202
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    • 2002
  • Ethanolamine (ETA), instead of ammonia, increases pH in the secondary system water and inhibits the corrosion of iron, which improves the integrity of the steam generator tubes. The different physicochemical properties of ETA from ammonia provide the different effect on the dissolution and adsorption of corrosion products entering the steam generator and thus on the hideout returns of ionic impurities in the steam generator sludge pile. The objective of this study was to investigate those properties with increasing temperature. ETA is more adsorbed onto the iron oxides, which increases the solubility of them and also lowers the hideout returns due to the reduced impurities adsorbed.

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Rates and Mechanism of Reaction of Dichlorobis(ethylenediamine)Cobalt(Ⅲ) Chloride with Diethanolamine Dithiocarbamate (디에탄올아민 디티오카바메이트와 트란스-디클로로비스(에틸렌디아민)코발트(Ⅲ)이온의 반응에 대한 속도와 메카니즘)

  • Kim, Chan Woo;Kim, Chang Su
    • Journal of the Korean Chemical Society
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    • v.40 no.5
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    • pp.302-307
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    • 1996
  • Diethanolamine dithiocarbamate is known to react with dichlorobis(ethylenediamine)cohalt(Ⅲ) chloride to form [Co(dtc)3](dtc=diethanolamine dithiocarbamate) in which two sulfur atoms of the dithiocarbamate are bound to cobalt. The complex is moderately soluble in acetone, but sparingly soluble in carbon disulfide. Kinetics and mechanisms of the reaction of dichlorobis(ethylenediamine)cobalt(Ⅲ) chloride with diethanolamine dithiocarbamate have been studied in aqueous solution. Activation parameters have been calculated from the kinetic data for the reaction and from these results a possible mechanism for the reaction has been proposed.

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Preparation of novel adsorbents for ethanolamine removal in water (수중의 에탄올아민 제거를 위한 새로운 형태의 흡착제 제조)

  • Kim, Jong Kyu;Gong, Jinhyeuk;Kim, Hyunjun;Lee, Min Hee;Joo, Jin Chul
    • Proceedings of the Korea Water Resources Association Conference
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    • pp.272-275
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    • 2017
  • 최근 국내 대부분의 원자력 발전소 2차 계통 중 복수 탈염설비의 운전 시 pH를 제어하기 위해 에탄올아민(Ethanolamine, ETA)를 사용하고 있으나 ETA를 적용한 후 발생하는 폐수에 의한 방류수의 화학적 산소요구량(COD) 및 총 질소(TN)의 증가는 심각한 환경적인 문제를 발생 시킨다. ETA가 강이나 하천과 같은 수계로 유입되면 자연적으로 생분해되기 힘들고, 분해부산물이 증가되어 수질을 악화시킬 수도 있다. 이러한 문제점을 해결하기 위해 본 연구에서는 폐경석, 제강슬래그, 저회를 혼합하여 제올라이트화(zeolitization)과정을 통해 새로운 형태의 저비용, 고효율의 ETA 처리용 복합흡착제를 제조하였다. 최적의 흡착 및 이온교환능력을 갖는 복합흡착제는 폐경석, 제강슬래그 및 저회의 혼합조성비를 Mixture Analysis 통계법을 통해 도출하였다.

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Electrochemical Characterization of Stainless Steel in Ethanolamine Solution Containing an Alkyl Group using Cyclic Voltammetry (순환전압전류법에 의한 알킬기를 함유한 에탄올아민용액에서 스테인리스의 전기화학적 특성)

  • Park, Keun-Ho
    • Journal of the Korean Applied Science and Technology
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    • v.31 no.1
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    • pp.66-73
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    • 2014
  • In this work, the current-voltage curves for stainless steel in the ethanolamine solution containing alkyl group were measured using the conventional three electrodes of cyclic voltammetry. Stainless steel as working electrode, Ag/AgCl electrode as reference electrode and Pt wire as counter electrode were used respectively. As a result, the C-V characteristics of stainless steel were to be for an irreversible process due to the oxidation current from cyclic voltammogram, using N-ethylethanolamine and N,N-dimethylethanolamine solutions. Effective diffusivity of corrosion inhibitors was decreased with increasing concentration. It was found from SEM images of the metal that the electrolyte (specific name ?)(0.5 N) as corrosion inhibitor was added into a N, N-diethylethanolamine solution ($1.0{\times}10^{-3}M$) containing copper and nickel, the corrosion inhibiting effect was enhanced.

Treatment of Wastewater Containing Ethanolamine from Coolant of the Secondary System of Nuclear Power Plant by UV/GAC Adsorption Oxidation Method (UV/GAC 흡착산화 공법을 이용한 원자력 발전소 2차 계통 냉각수로부터 발생하는 에탄올 아민 함유 폐수처리)

  • Choi, Min Jun;Kim, Hansoo
    • Applied Chemistry for Engineering
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    • v.28 no.3
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    • pp.318-325
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    • 2017
  • Wastewater including ethanolamine used in the second generation of nuclear power plants is filtered out in the ion exchange resin of the condensate polishing plant. In the regeneration process of ion exchange resin, a strong acidic wastewater containing ethanolamine and a lager amount of ionic substances are released. In this study, the process involving UV oxidation part with or without absorbents was developed for treating wastewater released from the ionic exchange resin. The effect of adsorbents on the wastewater treatment was investigated by using UV oxidation system developed by us. As a result, the COD removal efficiency of UV/GAC process with the granular activated carbon (GAC) as an adsorbent was 71.3% at pH 12.8. The removal efficiency was 21.8% higher than that of the wastewater treated using UV oxidation process without any adsorbents at the same condition. The removal of T-N was 88.6% at pH 12.8 when using UV oxidation with the GAC absorbent, which was 18.0% higher than that of using the UV oxidation process without any absorbents. It is thought that ethanolamine adsorbed on the absorbent improved the efficiency of UV oxidation process. Therefore, the UV/GAC adsorption oxidation process can be more effective in treating wastewater containing ethanolamine than that of using the process without any absorbents.

Amination of Ethanol over Large Pore Zeolites (큰 기공 제올라이트에서 에탄올의 아민화반응)

  • Jeon, Hee-Young;Jeon, Seong-Hee;Lee, Cheon-Jae;Shin, Chae-Ho
    • Clean Technology
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    • v.14 no.2
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    • pp.87-94
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    • 2008
  • The catalytic properties of large pore zeolite (mordenite, beta, and Y) with 12-membered rings were comparatively evaluated in the synthesis of diethylamines from ethanol amination. The number of strong acid sites, which obviously promoted the formation of mono- and diethylamines, was decreased with the increase of Si/Al ratio of the zeolites that were used. H-beta and H-Y zeolites with multidimensional pore channels favorably formed diethylether by the dimerization of ethanol, due to their large cage volumes and low acid strength. On the other hand, H-mordenite which has one dimensional straight channel was shown to be suitable for the formation of mono- and diethylamine which are well known as the useful intermediates of fine chemicals.

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Effect of Additives on Paper Aging (종이 첨가제가 종이의 노화에 미치는 영향)

  • 윤병호;이명구;최경화
    • Journal of Korea Foresty Energy
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    • v.21 no.2
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    • pp.25-33
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    • 2002
  • One of the critical problems to preserve books and documents in libraries and archives is the deterioration. Some of previous results showed that the major cause of paper deterioration was the acid-catalyzed hydrolysis of the cellulose in paper fibres and aging rate of acidic paper was faster than that of alkaline paper. Therefore, It is necessary to remove the acid in the paper for reducing the rate of paper deterioration. It has been reported to extend the useful life of acidic paper by three to five times. Recently, It has been recognized the need for an effective method of deacidifying large quantities of books and document. However, in the previous many reports little attention was paid to the effect of paper additives. In this paper, We carried out experiment about the effect of additives on paper aging and the effect of deacidification by the gaseous ethanolamines (monoehtanolamine, diethanolamine, triehtanolamine). In result, it was found that the strength of aging was in the order of the alum+rosin>alum >AKD> control and the rate of deacidification was in the order of the monoethanolamine>diethanolamine>triethanolamine. The treatment with the gaseous ethanolamines caused decreasing of brightness and dropping of fold endurances. However, deacidification by combination treatment of the various gaseous ehtnaolamines prevented from decreasing of brightness and dropping of folding endurances.

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