• Title, Summary, Keyword: Zeolite

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Separation of H2 and N2 Gases by PTMSP-NaA Zeolite Composite Membranes (PTMSP-NaA Zeolite 복합막에 의한 수소-질소 기체 분리에 관한 연구)

  • Kim, Ok-Su;Yun, Seok Il
    • Membrane Journal
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    • v.25 no.2
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    • pp.107-114
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    • 2015
  • PTMSP-NaA zeolite composite membranes were prepared by adding 0~50 wt% NaA zeolite to PTMSP. The membranes were characterized by FT-IR, $^1H$-NMR, GPC, DSC, TGA, SEM. The permeabilities of $H_2$ and $N_2$ gases through PTMSP-NaA zeolite composite membranes was studied as a function of NaA zeolite contents. According to TGA measurements, when zeolite was inserted into the polymer, weight loss temperature and weight loss wt% of PTMSP-NaA zeolite composite membranes were decreased. Based on SEM observation, NaA zeolite was dispersed in the PTMSP-NaA zeolite composite membrane with the size $2{\sim}5{\mu}m$. The permeability of PTMSP-NaA zeolite composite membranes increased added as NaA zeolite content increased. On the contrary, the selectivity ($H_2/N_2$) of the composite membranes decreased as NaA zeolite content increased. PTMSP-NaA zeolite composite membrane showed better permeability and selectivity ($H_2/N_2$) of $H_2$ and $N_2$ than PTMSP-NaY zeolite composite membrane.

Separation of Hydrogen-Nitrogen Gases by PDMS-NaA zeolite Mixed Matrix Membranes (PDMS-NaA zeolite 혼합기지분리막에 의한 수소-질소 분리)

  • Kang, Tae Beom;Hong, Se Ryeong
    • Membrane Journal
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    • v.25 no.3
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    • pp.295-300
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    • 2015
  • PDMS-NaA zeolite membranes were prepared by adding 0~40 wt% NaA zeolite. Based on SEM observation, NaA zeolite was dispersed in the PDMS-NaA zeolite membranes with $2{\sim}5{\mu}m$. The permeabilities of $H_2$ and $N_2$ gases through PDMS-NaA zeolite membranes increased as NaA zeolite contents increased and $H_2$ gas had better permeabilities than $N_2$. The selectivity ($H_2/N_2$) of PDMS-NaA zeolite membranes increased as NaA zeolite contents increased.

Preparation of Zeolite-Filled PDMS Membranes and Its Properties for Organic Vapor Separation

  • Kim, Min-Joung;Youm, Kyung-Ho
    • Korean Membrane Journal
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    • v.2 no.1
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    • pp.48-55
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    • 2000
  • In order to improve organic vapor separation efficiency of polydimethylsiloxane (PDMS) membrane, various zeolites (zeolite 4A, zeolite 13X and natural zeolite) were introduced into a thin PDMS film. The measurements of permeability and selectivity of zeolite-filled PDMS membranes were carried out with a CO$_2$gas and a CO$_2$gas/acetic acid vapor mixture, respectively. The CO$_2$permeability of zeolite-filled membranes decreased with increasing zeolite content and then recovered up to 30 wt% content. The effect of zeolite type on the improvement of CO$_2$permeability was found to be in the order of zeolite 13X > natural zeolite > 4A. The CO$_2$selectivity of zeolite-filled membranes was enhanced up to 9 times compared with the selectivity of a pure (unfilled) PDMS membrane. The effect of zeolite type on the improvement of CO$_2$selectivity was found to be in the order of natural zeolite > zeolite 13X > zeolite 4A.

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Synthesis of Columnar Na-P Zeolite by Hydrothermal Process from Natural Zeolite of Korea (천연 Zeollte로부터 열수합성에 의한 주상 Na-P Zeolite합성)

  • Zhang, Yong-Seon;Jung, Pil-Kyun;Kim, Sang-Hyo
    • Korean Journal of Soil Science and Fertilizer
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    • v.36 no.6
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    • pp.357-366
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    • 2003
  • This study was conducted to develop n convenient and efficient granular type absorbent with high CEC from powdery zeolite, which is a waste produced while crushing the natural zeolite of Korea to get a particular particle size. The change of mineralogical characteristics during hydrothermal alternation of natural zeolite to Na-P zeolite in alkaline solution at various reaction times was determined by X-ray diffraction (XRD), scanning electron microscopy (SEM), and total elemental analysis. The columnar aggregate of Na-P Zeolite was produced by calcinating the natural zeolite-charcoal extrudates of about 3 mm diameter. In 24 hours reaction, clinoptillonite, mordenite and feldspar in natural zeolite were disappeared by 3 N NaOH treatment, while Na-P Zeolite with spherical granular structure was newly detected by XRD. As increasing reaction time, Si/Al ratio in remaining solution was deceased. The CEC of the synthesized material increased more than 2 times compared with that of natural zeolite, although the diameter of Na-P zeolite were rather increased.

Preparation and Characterization of PTMSP/PDMS-zeolite Composite Membranes for Gas Separation (기체분리를 위한 PTMSP/PDMS-zeolite 복합막의 제조 및 특성)

  • Kim, Na-Eun;Kang, Tae-Beom;Hong, Se Lyung
    • Membrane Journal
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    • v.22 no.5
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    • pp.342-351
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    • 2012
  • In this study, PTMSP[poly(1-trimethylsilyl-1-propyne)]/PDMS[poly(dimethylsioxane)]-NaY zeolite and PTMSP/PDMS-NaA zeolite composite membranes were made to incorporate zeolite into PTMSP/PDMS graft copolymer in order to improve the selectivity and thermal stability, the drop of permeability by physical aging effect during long period of time for the PTMSP membrane. To investigate the physico-chemical characteristics of composite membranes, the analytical methods such as FT-IR, $^1H$-NMR, TGA, SEM, and GPC have been utilized. The gas permeability and selectivity properties of $H_2$ and $N_2$ were evaluated. The permeability of the PTMSP/PDMS-NaY zeolite and PTMSP/PDMS-NaA zeolite composite membranes than PTMSP/PDMS graft copolymer membrane increased, increased as zeolite content increased. On the contrary, the selectivity ($H_2/N_2$) of the composite membranes decreased as zeolite content increased. PTMSP/PDMS-NaA zeolite composite membrane showed better permeability and separation factor than PTMSP/PDMS-NaY zeolite composite membrane.

Separation of $H_2$ and $N_2$ Gases by PTMSP-NaY Zeolite Composite Membranes (PTMSP-NaY Zeolite 복합막에 의한 수소-질소 기체 분리에 관한 연구)

  • Kim, Ok-Su;Hong, Se Ryeong
    • Membrane Journal
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    • v.24 no.4
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    • pp.285-291
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    • 2014
  • The PTMSP[Poly(1-trimethylsilyl-1-propyne)]-NaY zeolite composite membranes were prepared by adding 0~50 wt% NaY zeolite to PTMSP. In order to investigate the characteristics of these membranes, we used the analytical methods such as FT-IR, $^1H$-NMR, GPC, DSC, TGA, and SEM. Gas permeation experiments were carried out at $23{\sim}26^{\circ}C$, $2kgf/cm^2$, and the permselectivity of $H_2$ and $N_2$ gases through the composite membranes was studied as a function of the NaY zeolite contents. According to TGA measurements, when NaY zeolite was inserted within the PTMSP, thermal stability of PTMSP was enhanced. Based on SEM observation, NaY zeolite was dispersed in the PTMSP-NaY zeolite composite membrane with a size of $1.5{\mu}m$. The permeability of $H_2$ and $N_2$ through the PTMSP-NaY zeolite composite membranes increased as NaY zeolite content increased. On the contrary, the selectivity($H_2/N_2$) of the PTMSP-NaY zeolite composite membranes decreased as zeolite content increased.

Removal of benzene from aqueous solution by TMA-Zeolite complex (TMA-Zeolite Comphx 에 의한 수용액(水溶液)중 Benzene 제거(除去))

  • Lee, Chan-Il;Lee, Dong-Hoon;Choi, Jyung
    • Korean Journal of Environmental Agriculture
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    • v.17 no.1
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    • pp.43-47
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    • 1998
  • This study was performed to remove the dissolved benzene in water by using TMA-Zeolite complex which was formed by the adsorption of TMA(Tetramethyl ammonium), a kind of ration surfactant on a natural zeolite produced in Korea. The dorminant clay minerals of the natural zeolite was identified by X-ray diffractometry and Infrared spectrophotometry to be mordenite and clinoptilolite. The CEC of the zeolite used was 95.9 cmol/kg. TMA was adsorbed on natural zeolite very quickly, and the amount of TMA adsorption on zeolite was known to be equivalent to about 8% of the CEC of natrual zeolite. The amount of benzene adsorption on TMA-zeolite complex was much more than natural zeolite, indicating that the dissolved benzene in water could be removed effectively by TMA-zeolite comple.

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Response of the Application of Slow-release Potassium Fertilizer Using Natural Zeolite to Flue-cured Tobacco (Nicotiana tabacum L.) (천연(天然) Zeolite를 이용한 완효성(緩效性) K 비료(肥料)의 황색종(黃色種) 연초(煙草)에 대(對)한 시용효과(施用效果))

  • Lee, Dong-Hoon;Park, Soo-June;Choi, Jyung
    • Korean Journal of Soil Science and Fertilizer
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    • v.22 no.3
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    • pp.215-220
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    • 1989
  • For development of slow releaseing K-fertilizer using natural zeolite, two kinds of K adsorbed zeolite were made by ion exchange reaction in $K^+$ saturated aqueous solution. K-Zeolite was prepared by removing the excess salt after K adsorption on zeolite, however, NW. K-Zeolite was prepared only by K adsorption reaction without removing the excess salt. The adsorbed K on zeolite was not easily released, but continuously and slowly released from the surface of zeolite. By the results of application for tobacco cultivation, the K contents in soil treated with K-Zeolite and NW. K-Zeolite were lower than that of control (20kg/10a) at the early growth stage, but were higher at the late growth stage. Therefore, the results suggest that K adsorbed zeolite could be applied as a slow-releasing K fertilizer.

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Characteristic of $Ca^{2+}$ Ion Exchange by the Synthesized Zeolite 4A from Fly ash (비산회로부터 합성한 제올라이트의 4A의 칼슘 이온교환 특성)

  • 연익준;주소영;김광렬
    • Journal of environmental and Sanitary engineering
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    • v.14 no.4
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    • pp.165-171
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    • 1999
  • A study on the synthesis of zeolite 4A using the bituminous coal fly ash from power plant was carried out. This study aims to investigate possibility for detergent builder with synthesized zeolite. It was examined at the crystallization conditions of atmospheric pressure and that of pressurization. The synthesized zeolite was proved to be Zeolite 4A type by means of the XRD and SEM analysis, and then the synthesized zeolite was used as an absorbent the remove the $Ca^{2+}$ ions in the water. In this study, commercial zeolite and synthesized zeolite reached equilibrium within 10 and 30 minutes respectively. The amount of $Ca^{2+}$ ions exchanged by the commercial zeolite, atmospheric pressure zeolite (zeolite A) and pressurized zeolite(zeolite PA) were 391mg/L(as $CaCO_3$), 323mg/L(as $CaCO_3$) and 355mg/L(as $CaCO_3$) respectively.

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Utilization of Natural Zeolite for $NH_4^\;^+-N$ Adsorbent (($NH_4^\;^+-N$ 흡착제(吸着劑)로서의 천연(天然) Zeolite의 이용(利用))

  • Kim, Sang-Su;Hur, Nam-Ho;Choi, Jyung
    • Korean Journal of Environmental Agriculture
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    • v.10 no.1
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    • pp.27-31
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    • 1991
  • This study was conducted to examine the adsorption capacity of $NH_4\;^+-N$ by natural zeolite for the purpose of investigating the possibility for $NH_4\;^+-N$ eliminator of Korean natural zeolite. The dominant clay minerals of zeolite were clinoptilolite and mordenite. The reaction of $NH_4\;^+-N$ adsorption by zeolite reached equilibrium after 4hrs. The amount of $NH_4\;^+-N$ adsoption by zeolite was not significantly affected by the particle size of zeolite. The order of $NH_4\;^+-N$ adsorption by zeolite according to exchangeable cations was Na-> Ca> K-saturated zeolite. The amount of $NH_4\;^+-N$ adsorption by zeolite was increased with increasing pH of solution and the ratio of zeolite to the volume of solution. The isothermal curvel of $NH_4\;^+-N$ adsorption by zeolite was conformed to Langmuir equation.

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