• Title, Summary, Keyword: zeolite adsorbent

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A Study on the Adsorption Characteristics of Nitrogen and Oxygen on Ion Exchanged Zeolite Adsorbents (이온교환된 제올라이트 흡착제의 질소 및 산소 흡착 특성 연구)

  • Jeong, Heon-Do;Kim, Dong-Sik;Kim, Kweon-Ill
    • Applied Chemistry for Engineering
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    • v.16 no.1
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    • pp.123-130
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    • 2005
  • Zeolite X adsorbents with large surface area were prepared for using oxygen PSA adsorbent. Selective adsorption performance of nitrogen on the synthesized zeolite X adsorbent was improved by the cation exchange of adsorbent. The zeolite X which had over $650m^2/g$ surface area was synthesized at the conditions of $SiO_2\;:\;Na_2O\;:\;H_2O\;:\;Al_2O_3$ = 2.5 : 3.5 : 150 : 1 mole ratio, $98^{\circ}C$ temperature and 18 h synthesized time in 50 L reactor. The metal ions Li, Ag, Ca, Br, Sr, etc. were investigated for ion exchange with zeolite X. Ag ion was showed the highest ion exchange rate among these metal ions and all metal ions were exchanged with Na ion at equivalent rate. Compared with the NaX adsorbent, the ion exchanged zeolite X adsorbent remarkably improved its adsorption performance of nitrogen at the conditions of $10{\sim}40^{\circ}C$ temperature and 0~9 atm pressure. At an equilibrium pressure under 0.5 atm, adsorption performance of nitrogen on the ion exchanged zeolite adsorbent increased in the order of Ag > Li > Ca > Sr> Ba > K, whereas at an equilibrium pressure over 1 atm showed in the order of Li > Ag > Ca > Sr > Ba > K. Nitrogen/oxygen separation factor of Li ion exchanged zeolite X adsorbent was 13.023 at the partial pressure of nitrogen/oxygen gas mixture similar to air and $20^{\circ}C$ adsorption temperature.

Preparation of Honeycomb Adsorbent for Carbon Dioxide Adsorption and Its Characteristics (이산화탄소 흡착제거를 위한 허니컴 흡착소자의 제조 및 이의 특성)

  • Yoo, Yoon-Jong;Kim, Hong-Soo;Park, Jong-Ho;Han, Sang-Sub;Cho, Soon-Haeng
    • Applied Chemistry for Engineering
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    • v.18 no.3
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    • pp.273-278
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    • 2007
  • The honeycomb adsorbents and adsorption process for carbon dioxide removal from fuel gas were investigated. Zeolite paper was made with Na-X zeolite powder and ceramic fiber as raw materials. $Li^+$, $Ca^{2+}$ or $K^+$ ion exchanges for Na-X zeolite and additional Na-X coating were performed on zeolite paper for increasing the carbon dioxide adsorption capacity, after that the adsorption characteristics of the samples were analyzed. Among the ion exchanged samples, $Li^+$ ion exchanged zeolite paper was most promising but its carbon dioxide adsorption capacity was less than expected for process application. However, additional Na-X coating was found to be an effective method for increasing the carbon dioxide adsorption capacity of the zeolite paper for process application. The carbon dioxide breakthrough test of the honeycomb adsorbent prepared with the zeolite paper was studied, and fuel gas treatment capacity was calculated when the honeycomb adsorbent was used in the rotary adsorption process.

Evaluation for adsorption of low concentration of indoor $CO_2$ adsorption using zeolite and alkali metal (제올라이트 및 알칼리금속을 이용한 실내용 저농도 $CO_2$ 흡착제의 성능 평가)

  • Lim, Yun-Hui;Lee, Ju-Yeol;Cha, Yu-Joung;Park, Byung-Hyun
    • Journal of the Korean Applied Science and Technology
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    • v.30 no.3
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    • pp.494-503
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    • 2013
  • In this study, $CO_2$ adsorbent was produced for minimizing energy loss due to ventilation within the building. For improved selectivity about low concentration of $CO_2$ in multiple-use facilities, the ball type adsorbent was modified from a commercial zeolite, alumina, alkali metals and activated carbon with mixing LiOH, binder, and $H_2O$. We measured specific surface area, pore characteristic, and crystal structure of the modified adsorbent. Effects of alkalization on the absorptive properties of the adsorbents were investigated. Continuous column tests (2,000 ppm) and batch chamber tests ($4m^3$, 5,000ppm) showed that the modified adsorbent indicated about the selectivity of $CO_2$ more than 9.7% (0.613 mmol/g) compared with ordinary adsorbents and $CO_2$ removal efficiency of 88.8% within l hour, respectively. It was estimated that the modified adsorbent was applicable to indoor environments.

Study of PSA Process for Carbon Dioxide Recovery over Zeolite Adsorbent: Effect of Rinse Rate on Process Performance (제올라이트 흡착제 상에서 이산화탄소 회수를 위한 PSA 공정 연구: 공정성능에 대한 세정유량의 영향)

  • 전종기;박영권;주국택
    • Journal of Korean Society for Atmospheric Environment
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    • v.20 no.1
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    • pp.99-110
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    • 2004
  • In order to investigate the performance of carbon dioxide PSA over zeolite adsorbent, the present study showed results of isotherm measurement, cyclic operation of 3-bed apparatus, and the corresponding numerical simulation. The experiment data of bed temperature, purity, recovery were matched well with that of numerical simulation. Purity of both gas and adsorbent phase increased rapidly with rinse rate but the degree of increase was retarded for large rinse rate The total amount of adsorbed increased only 10% even if rinse rate was enlarged to 4 times. Optimal rinse rate was 7N㎥/hr in this study. The heating rinse led to augments in recovery and productivity, possibly thanks to ease of description resulting from increased volumetric rinse rate and temperature rise in the column.

Immobilization of Lead in Contaminated Soil by Ekectrokinetic Remediation and Adsorbent (흡착재와 Electrokinetic 기법을 이용한 납 오염토의 고정화)

  • Han Sang-Jae;Kim Byung-Il;Lee Goon-Taek;Kim Soo-Sam
    • Journal of Soil and Groundwater Environment
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    • v.10 no.2
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    • pp.1-11
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    • 2005
  • This study applied EK method to remediate contaminated soil by lead (Pb), tried increasing efficiency of remediation using adsorbent (apatite and zeolite) as enhanced EK remediation method to overcome the limit of traditional EK remediation method. Adsorption tests on Pb were practiced to extract EK, making different concentration of contaminated soil, voltage condition, operating time etc., transferring Pb-ion into the position of adsorbent, then tried immobilization. On this results, the efficiency of remediation is different on its test conditions. In addition, the efficiency of remediation was not only improved by adding electrode revεrsal and install position of adsorbent but also satisfied TCLP regulation of EPA in USA through the whole sample range. Finally, absorption and immobilization capacity of apatite and zeolite proved on its excellence and confirmed the possibility of application of apatite and zeolite as enhanced EK remediation method.

BIOFILTRATION OF GASEOUS TOLUENE USING ADSORBENT CONTAINING POLYURETHANE FOAM MEDIA

  • Amarsanaa, Altangerel;Shin, Won-Sik;Choi, Jeong-Hak;Choi, Sang-June
    • Environmental Engineering Research
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    • v.11 no.1
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    • pp.1-13
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    • 2006
  • In this study, conventional biofilters packed with flexible synthetic polyurethane (PU) foam carriers were operated to remove toluene from a contaminated air stream. PU foams containing various adsorbents (e.g., zeolite, sepiolite, dolomite and barite) were synthesized for the biofilter media and their adsorption characteristics of toluene were determined. Adsorption capacity of PU-adsorbent foam was in the order of PU-dolomite ${\approx}$ PU-zeolite > PU-sepiolite > PU-barite. During the biofiltration experiment, influent toluene concentration was in the range of 0-160 ppm and EBRT (i.e., empty bed residence time) was 45 seconds. Pressure drop of the biofilter bed was 4-5 mm $H_2O/m$ column height. The maximum removal capacity was in the order of PU-dolomite > PU-zeolite > PU-sepiolite > PU-barite, while the complete removal capacity was in the order of PU-dolomite > PU-sepiolite > PU-zeolite > PU-barite. The better biofiltration performance in PU-dolomite foam was because PU-dolomite foam had lower density and higher porosity than the others providing favorable conditions for microbial growth. The results of biodegradation kinetic analysis showed that PU-dolomite foam had higher maximum removal rate ($V_m\;=\;11.04\;g$ toluene/kg dry material/day) and saturation constant ($K_s\;=\;26.57\;ppm$) than the other PU foams. This supports that PU-dolomite foam was better than the others for biofilteration of toluene.

Adsorption of Heavy Metal Ions by Synthesized Zeolite 4A using Bituminous Coal Fly Ash (유연탄 비산회로부터 합성한 제올라이트 4A에 의한 중금속 이온의 흡착)

  • 김상호;연익준;김광렬
    • Journal of environmental and Sanitary engineering
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    • v.14 no.3
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    • pp.63-70
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    • 1999
  • A study on the zeolite synthesized of bituminous coal fly ash from power plant has been carried out to reuse industrial waste. The synthesized zeolite was proved to be 4A type by means of the X-ray diffraction analysis and the degree of crystallinity was found to be higher than 90%. Then the synthesized zeolite was used as an adsorbent to remove the heavy metal ions in the CU, Pb, and Cd containing wastewater and water. Also, adsorption characteristics and kinetics of synthesized zeolite in the each metal ion solutions were studied. In each ion solutions, the adsorbed amounts of Pb, Cd, and Cu to the unit weight of synthesized zeolite were 141.6, 118.8, and 131.4mg/g respectively when each metal ion concentration was 500mg/L solution. The adsorption kinetics was fitted well to the Freundlich isotherms. The value of l/n for Pb, Cd, and Cu and 0.27, 0.50, and 0.66, respectively. Those results showed that the synthesized zeolite could be used as an adsorbent to remove single heavy metal ions in the wastewater and water. The heats of adsorption, H values of Pb, Cd, and Cu were 4.87, 14.95, and 18.23kacl/mol by the Henry-van't Hoff equation.

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Preparation of NaX Zeolite Coated Honeycomb Adsorbents and It's Carbon Dioxide Adsorption Characteristics (NaX 제올라이트가 담지된 허니컴 흡착제의 제조 및 이의 이산화탄소 흡착특성)

  • Yoo, Yoon-Jong;Kim, Hong-Soo;Singh, Ranjeet;Xiao, Penny;Webley, Paul A.;Chaffee, Alan L.
    • Applied Chemistry for Engineering
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    • v.20 no.6
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    • pp.663-669
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    • 2009
  • The honeycomb adsorbent was prepared for adsorbing and seadsorbent was prepared by using zeolite sheet, which contained zeolite as component. The steady-state adsorption properties and surface morphologies were analyzed and breakthrough characteristics were ananlyzed by providing 16% carbon dioxide mixed gas. By thermal regeneration, carbon dioxide concentration properties were analyzed, and the adsorptive separation process was compared between thermal swing adsorption and pressure swing adsorption after adsorbent temperature change during heating. The breakthrough results of the honeycomb showed possibility parating carbon dioxide from combustion exhaust gas, which had deep impact on climate change, and the characteristics of the adsorbent were studied. Na-X zeolite was coated on a honeycomb prepared with ceramic sheet or active carbon sheet so that the two honycomb can be used at high temperature. Third honeycomb of rotary adsorptive concentration process.

Removal of Cs and Sr Ions by Absorbent Immobilized Zeolite with PVA (제올라이트를 PVA로 고정화한 흡착제에 의한 Cs과 Sr 이온 제거)

  • Lee, Chang-Han;Lee, Min-Gyu
    • Journal of Korean Society of Environmental Engineers
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    • v.37 no.8
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    • pp.450-457
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    • 2015
  • In this research a adsorbent, PVA-Zeolite bead, was prepared by immobilizing zeolite with PVA. The results of XRD and SEM analysis showed that the prepared PVA-Zeolite beads had porous structure and the zeolite particles were in mobilized within the internal matrix of the beads. The adsorption properties of Sr ion and Cs ion with the adsorbent were studied by different parameters such as effect of pH, adsorption rate, and adsorption isotherm. The adsorption of Sr ion and Cs ion reached equilibrium after 540 minutes. The adsorption kinetics of both ions by the PVA-Zeolite beads were fitted well by the pseudo-second-order model more than pseudo-first-order model. The equilibrium data fitted well with Langmuir isotherm model. The maximum adsorption capacities of Sr ion and Cs ion calculated from Langmuir isotherm model were 52.08 mg/g and 58.14 mg/g, respectively. The external mass transfer step was very fast compared to the intra-particle diffusion step in the adsorption process of Cs ion and Sr ion by the PVA-Zeolite beads. This result implied that the rate controlling step was the intra-particle diffusion step.

Improvement of Porcine Epidemic Diarrhea Disease Vaccine Productivity by Ammonium Ion Removal in a Carberry Type Bioreactor (Carberry Type 생물반응기에서 암모늄 이온 제거에 의한 돼지유행성설사병 바이러스 백신 생산성 증대)

  • Lee, Chang-Jin;Jeong, Yeon-Ho
    • Korean Chemical Engineering Research
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    • v.49 no.5
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    • pp.588-593
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    • 2011
  • The porcine epidemic diarrhea virus(PEDV) production yield in spinner flask cultures using Vero cells immobilized on microcarriers was improved by the selective adsorption of ammonium ions in a Carberry type bioreactor which was equipped with Phillipsite-Gismondine synthetic zeolite. Though the apparent cell growth seemed to be lower than that of control due to the aggregation of microcarriers between impeller shaft and the adsorbent, zeolite was found to not to be toxic to Vero cell, considering estimated glucose and lactate changes. Zeolite was observed to remove ammonium ions effectively in both steps of cell growth and virus production. In virus production, the virus titer with zeolite was two times higher than that without zeolite. Consequently, zeolite was found to be an ideal adsorbent for higher production of virus vaccine with the effective removal of ammonium ions.