• Title/Summary/Keyword: H-킬레이트

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Reuse of Hydrogen Sulfide by Ferric Chelate Reaction of Food Waste Anaerobic Digestion Gas, Sulfur Recovery and its Economic Evaluation (킬레이트 착화학반응에 의한 음식물폐기물 혐기소화가스 중 황화수소의 제거와 황회수 및 경제성평가)

  • Park, Young G.;Yang, Youngsun
    • Clean Technology
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    • v.20 no.4
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    • pp.367-374
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    • 2014
  • Several experiments have been done to investigate the removal of hydrogen sulfide ($H_2S$) synthetic gas from biogas streams by means of chemical absorption and chemical reaction with 0.1-1 M Fe/EDTA solution. The roles of Fe/EDTA were studied to enhance the removal efficiency of hydrogen sulfide because of oxidizing by chelate. The motivation of this investigation is first to explore the feasibility of enhancing the toxic gas treatment in the biogas facility. The biogas purification strategy affords many advantages. For instance, the process can be performed under mild environmental conditions and at low temperature, and it removes hydrogen sulfide selectively. The end product of separation is elemental sulfur, which is a stable material that can be easily disposed with minor potential for further pollution. As the Fe-EDTA concentration increased, the conversion rate of hydrogen sulfide increased because of the high stability of Fe-EDTA complex. pH as an important environmental factor was 9.0 for the stability of chemical complex in the oxidation of hydrogen sulfide.

Elution Behavior of Pd(II) - Isonitrosoethylacetoacetate Imine Chelates by Reversed Phase High Performance liquid Chromatography (역상 액체 크로마토그래피에 의한 Pd(II) - Isonitrosoethylacetoacetate Imine 유도체 킬레이트들의 용리 거동)

  • Kim, In-Whan;Shin, Han-Chul;Lee, Man-Ho;Yoon, Tai-Kun;Kang, Chang-Hee;Lee, Won
    • Analytical Science and Technology
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    • v.5 no.4
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    • pp.389-399
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    • 1992
  • Liquid Chromatographic behavior of Pd(II) in Isonitrosoethylacetoacetate lmine, $Pd(IEAA-NR)_2$ (R=H, $CH_3$, $C_2H_5$, $n-C_3H_7$, $C_6H_5-CH_2$, $n-C_4H_9$) chelates were investigated by reversed-phase HPLC on Micropak MCH-5 column using methanol/water as mobile phase. The optimum conditions for the separation of $Pd(IEAA-NR)_2$ chelates were examined with respect to the effect of the flow rate, sample solvent, mobile phase strength and column temperature. It wass found that metal chelates were properly eluted in an acceptable range of capacity factor value($0{\leq}log\;k^{\prime}{\leq}1$). The dependence of the logarithm of capacity factor(k') on the volume fraction of water in the binary mobile phase was examined. Also, the dependence of k' on the liquid-liquid extration distribution ratio($D_c$) in methanol-water/n-alkane extration system was investigated. Both kinds of dependence are linear, which susggests that the retention of the electroneutral metal chelate is largely due to the solvophobic effect. Standard adsorption enthalpy changes (${\Delta}H^{\circ}$) and standard adsorption entropy changes (${\Delta}S^{\circ}$) of Pd(II) Isonitrosoethylacetoacetate imine chelates on Micropak MCH-5 column were calculated by measuring capacity factor with changing temperature of the column.

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A Study on the Elution Mechanism of Ni(II)-Isonitrosoethylacetoacetate Imine Chelates by Reversed Phase High Performance Liquid Chromatography (역상 액체 크로마토그래피에 의한 Ni(II)-Isonitrosoethylacetoacetate Imine 유도체 킬레이트의 용리 메카니즘에 관한 연구)

  • Kim In-Whan;Choi Gang-Yeol;Lee Man-Ho;Kang Chang-Hee;Lee, Won
    • Journal of the Korean Chemical Society
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    • v.36 no.5
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    • pp.697-708
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    • 1992
  • Liquid Chromatographic behavior of Ni(II) in Isonitrosoethylacetoacetate Imine(IEAA-NR), Ni(IEAA-NH)(IEAA-NR)(R = H, CH_3, C-2H_5, n-C_4H_9, C_6H_5-CH_2) chelates were investigated by reversed-phase HPLC on Micropak MCH-5 column using methanol/water as mobile phase. The optimum conditions for the separation of Ni(IEAA-NH)(IEAA-NR) chelates were examined with respect to the effect of the flow rate, sample solvent, mobile phase strength and column temperature. It was fo$und that metal chelates were properly eluted in an acceptable range of capacity factor value(0{\le}logk'{\le}1). The dependence of the logarithm of capacity factor (k') on the volume fraction of water in the binary mobile phase as well as on the liquid-liquid extraction distribution ratio (Dc) in methanol-water/n-alkane extraction system showed the good linearties, and the dependence of the logarithm of capacity factor (k') on the column temperature and on the enthalpy exhibited the good linearties, and the compensation temperature ({\beta}) from the slope was 773.47{\circ}K. It was suggested that the retention of metal chelates was largely affected by the hydrophobic effect.

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A Study of Selective Absorption of Metal Ions by Chelating Agent-Loaded Anion Exchange Resins (킬레이트 시약으로 처리한 음이온 교환수지에 의한 금속이온의 선택적 흡착에 관한 연구)

  • Lee Dai Woon;Lee, Won;Yu Euy Kyung
    • Journal of the Korean Chemical Society
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    • v.23 no.3
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    • pp.141-151
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    • 1979
  • The selective absorption of metal ions by chelating agent-loaded resins was studied in aqueous media. The resins were prepared by loading the conventional anion exchange resin, Dowex 1-X8 (50 to 100 mesh) with chelating agents containing sulfonic group, such as 8-hydroxy-quinoline-5-sulfonic acid (HQS) and 7-nitroso-8-hydroxyquinoline-5-sulfonic acid (NHQS). The stability of the resin was markedly influenced by the following factors; (1) the affinity and concentration of anions in the external solution, (2) the pH of the media. The optimum conditions for the absorption of metal ions were determined with respect to the pH, shaking time, and the effect of anion concentration in the medium. Under the optimum condition the order of the absorption of metal ions such as Fe(Ⅲ), Cu(Ⅱ), Pb(Ⅱ), and Zn(Ⅱ) was in accord with that of the stability constants of the chelates. The total capacities of the resins were found in the range of 0.6∼1.6 mmole metal per gram.

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Chelation of Tannin from Sorghum Extract using Fe(II) (수수 타닌의 Fe(II) 킬레이트)

  • Jung, Yang Sook;Seo, Hyo Sik;Bae, Do Gyu
    • Current Research on Agriculture and Life Sciences
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    • v.33 no.1
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    • pp.1-5
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    • 2015
  • This study investigated the chelation of a sorghum bran extract using iron (Fe) as a new natural colorant. The composition of the sorghum bran extract and chelation conditions were both examined. The thermal properties of the chelated colorants were analyzed using differential scanning calorimetry (DSC) and a thermal analyzer system(TGA). The sorghum bran extract solution showed a maximum absorbance at 281 nm based on UV/Vis spectrophotometry. According to the chelation pH conditions, pH 7.5 was the most effective. The chelation of the sorghum bran extract increased rapidly when increasing the iron concentration up to 2 mg/L, with no further chelation at a higher concentration. The particle size distribution curve for the chelated tannin revealed four groups: $4.5{\sim}17{\mu}m$, $20{\sim}42{\mu}m$, $45{\sim}80{\mu}m$, and $83{\sim}160{\mu}m$. In a DSC analysis, endothermic peaks attributed to the pyrolysis of the extract and chelated tannin were found at $318^{\circ}C$ and $415^{\circ}C$, respectively. In a TGA analysis, the chelation was shown to increase the final degradation temperature from $253^{\circ}C$ to $382^{\circ}C$, confirming that the chelation improved the thermal stability.

A Study on the Elution Behavior of Pd-Isonitroso ethylacetoacetate imine Chelates by Reversed-phase High Performance Liquid Chromatography (역상 고성능 액체 크로마토 그래피에 의한 Pd(II) - isonitrosoethylacetoacetate imine 유도체 킬레이트의 용리거동에 관한 연구)

  • Kim, Hyun
    • Journal of the Society of Cosmetic Scientists of Korea
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    • v.19 no.1
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    • pp.20-30
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    • 1993
  • Liquid Chromatographic behavior of Pd(II) in Isonitosoethylacetoacetate imine IEAA-NR: R=H, CH3, C2H5, n-C3H7, n-C4H9, C6H5-CH2) Chelates were investigated by reversed phase high performance 1iquid chromatography on Micropak MCH-5 Column using Methanol /water as mobile phase. The optimum condition for the separation of Pd-Isonitrosoethylacetoacetate imine chelates were examined with respect to the flow rate, mobile phase strength. It was found that Pd(IEAA-NR)2 chelates were eluted in an acceptable range of the capacity factor value (0 $\leq$ log k' $\leq$ 1), The dependence of the logarithm of capacity factor(k') on the volume fraction of water in mixture with in the binary mobile phase was examined. Also, the dependence of k'on the liquid-liquid extraction distribution constant in methanol-water / n-alkane extraction system was on system was invert tigated for Pd(IEAA-NR)2. Both kinds of dependence are linear, which suggests that the retention of the electroneutral metal chelates be largely due to the solvophobic effect.

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Properties and Environmental Effects Estimation of Grout Using Set Accelerating Agent Made From Calcium Aluminate and Viscosity Agent (칼슘알루미네이트계 급결재와 증점제를 사용한 그라우트의 특성 및 환경영향 평가)

  • Heo, Hyung Seok;Yi, Seong Tae;Noh, Jae Ho
    • Journal of the Korea institute for structural maintenance and inspection
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    • v.16 no.4
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    • pp.122-129
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    • 2012
  • In this study, environmental problems(i.e., pH elevation and $Cr^{6+}$ detection) occurred by using the cement grout made from CA(calcium aluminate) were evaluated using viscosity agents(MC, chelate polymer). Ordinary portland cement and blaste-furnace slag cement were used by main materials and ACC(blended mixture of calcium aluminate) were used by accelerator for hardening of grout. In addition, viscosity agents were used for preventing pH elevation and heavy metal detection from grouting materials. From the results, it was noted that when chelate polymer was used, pH elevation and $Cr^{6+}$ detection were minimized. However, other cases showed higher pH elevation and $Cr^{6+}$ detection. At test 1 day, $Cr^{6+}$ detection with age presented over 97% of total value and, after that, additional increase was not distinct. As a result of this study, it was acknowledged that, to control pH elevation and heavy-metal (like $Cr^{6+}$) detection, the usage of BSC and chelate polymer is a very useful fact.

A Study on the Sorption Behavior of U(VI) ion by Arsenazo I-XAD-2 Chelating Resin (Arsenazo I-XAD-2 킬레이트수지를 이용한 U(VI) 이온의 분리 및 농축에 관한 연구)

  • Lee, Chang-Hun;Lee, Si-Eun;Lim, Jae-Hee;Eom, Tae-Yoon;Kim, In-Whan;Kang, Chang-Hee;Lee, Won
    • Analytical Science and Technology
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    • v.6 no.5
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    • pp.489-499
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    • 1993
  • Some sorption behaviors of U(VI) ion on Arsenazo I-XAD-2 chelating resin were investigated. This chelating resin was synthesized by the diazonium coupling of Amberlite XAD-2 resin with Arsenzo I chelating reagent and characterized by elementary analysis method and IR spectrometry. The optimum conditions for the sorption of U(VI) ion were examined with respect to pH, U(VI) ion concentration and shaking time. Total sorption capacity of this chelating resin on U(VI) ion was 0.39mmol U(VI)/g resin in the pH range of 4.0~4.5. This chelating resin was showed increased sorption capacity on the increased pH value. It was confirmed that sorption mechanism of U(VI) ion on the Arsenazo I-XAD-2 chelating resin was competition reacting between U(VI) ion and $H^+$ ion. Breakthrough volume and overall capacity of U(VI) ion measured by column were was 600 ml and 0.38 mmol U(VI)/g resin, respectively. The desorption of U(VI) ion was showed recovery of 90~96% using 3M $HNO_3$ and 3M $Na_2CO_3$ as a desorption solution. The separation and concentration of U(VI) ion from natural water and sea water was performed successfully by Arsenazo I-XAD-2 chelating resin.

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Optical Resolution of DABS-Amino Acids with Mobile Chiral Chelate Addition (키랄킬레이트 이동상첨가법에 의한 답실아미노산의 광학이성질체 분리)

  • Lee, Seon Haeng;O, Dae Seop;Byeon, Seong Gu
    • Journal of the Korean Chemical Society
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    • v.34 no.4
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    • pp.345-351
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    • 1990
  • Optical isomers of DABS-amino acids have been separated in a reversed phae high performance liquid chromatography by adding Cu (Ⅱ)-L-Proline chelate to the mobile phase. The retention behaviors for the DABS-amino acids are discussed in terms of pH of the mobile phase and the concentrations of acetonitrile, Cu (Ⅱ) complex, and buffer. The selectivity of the optical isomers of DABS-amino acids increases with the pH of the mobile, and the concentration of the chelate, but decreases with concentration of the oganic modifier. The concentration of buffer does not affect the optical separation selectivity. A separation mechanism is illustrated by cis and trans formation based on the steric effect of the ligand exchange reaction between DABS-amino acids and the copper chelate.

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