• Title/Summary/Keyword: Zeolite A

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Effect of Zeolite Filler on the Thermal and Mechanical Properties of Cellulose Diacetate (Cellulose Diacetate의 열적 및 기계적 물성에 미치는 Zeolite 충전효과)

  • Lee, Chang-Kyu;Cho, Mi-Suk;Kim, In-Hoi;Nam, Jae-Do;Lee, Young-Kwan
    • Polymer(Korea)
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    • v.33 no.3
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    • pp.243-247
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    • 2009
  • Cellulose diacetate (CDA) was plasticized with triacetine (TA) and epoxidized soybean oil (ESO) in a high speed mixer. Composites of plasticized CDA and zeolite were prepared by a melting process. The $T_g$ value, $106^{\circ}C$ of the plasticized CDA was confirmed by DMA analysis. The $T_g$ value of the CDA with 50% zeolite was $125^{\circ}C$. As the content of zeolite was increased from 10 to 50% the modulus of the composite was increased from 1.7to 3.6 GPa by two times over the plasticized CDA, and its tensile strength was increased to 62 MPa and then decreased down 51 MPa, and its elongation was increased to 10% and then decreased down 3.2%. In the SEM image, the compatibility between CDA and zeolite was observed. Increasing the amount of zeolite in the composites resulted in further enhancement of the $CH_3COOH$ absorption effects.

Manufacturing of Mg-Zeolite Using for Simultaneous Recovery of the N and the P from sewage water (하수로부터 질소(N)와 인(P)을 동시에 회수할 수 있는 Mg-Zeolite의 제조)

  • Cho, Heon-Young;Suh, Jung-Mok
    • Proceedings of the Korean Institute of Resources Recycling Conference
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    • 2003.10a
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    • pp.122-128
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    • 2003
  • To develop a Mg-Zeolite for simultaneous recovery of the N and the P from sewage water, the natural zeolite was treated with 20% $MgCl_2$ solution by changing the pH the temperature and the treating time of the solution. And the contents of Ca Fe Na K Mg of Mg-Zeolite were analyzed by ICP. The optimum treatment condition for Mg-Zeolite was induced to pH 7.0 $50^{\circ}C$ in 20% $MgCl_2$ solution and for 80min treatment. And the Na and the K ions in natural zeolite are significant factors for Mg exchange in the zeolite.

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Performance Evaluation of Modified Zeolite with Mg for the Treatment of Dyeing Wastewater (Mg으로 개질한 Zeolite를 이용하여 염색공장 폐수처리 평가)

  • Choi, Hee-Jeong
    • Journal of Korean Society on Water Environment
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    • v.31 no.4
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    • pp.392-398
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    • 2015
  • The aim of this study was to investigate the bio-adsorption using modified zeolite with Mg (Mg-zeolite) in the dyeing wastewater treatment. Mg-zeolite adsorbed successfully 100% of the color, suspended solid (SS). chemical oxygen demand (COD), biological oxygen demand (BOD), total nitrogen (TN) and total phosphorus (TP) in the dyeing wastewater at the following optimal Mg-zeolite loading: 20 mg/L for colour, SS, TN and TP, 30 mg/L for BOD and COD. These results indicated that the amount of 1 mg/L Mg-zeolite adsorbed 11.6 mg/L for color, 9.5 mg/L for SS, 45.0 mg/L for COD, 12.7 mg/L for BOD, 0.91 mg/L for TP and 2.25 mg/L for TN. The bio-adsorbent, Mg-zeolite, can be a promising adsorption due to its high efficiency and low dose requirements.

Synthesis and characterization of microporous TS-1 zeolite(MFI) (Microporous TS-1 Zeolite(MFI)의 합성과 특성)

  • 강선명;이희수;김익진
    • Journal of the Korean Crystal Growth and Crystal Technology
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    • v.9 no.3
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    • pp.309-314
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    • 1999
  • A microporous zeolite-type tianosilicate (TS-1), new catalysis elements, was synthesized by differents of the reactant solution pH. The range of reactant solution pH has from 10.0 to 12.4 TS-1 Zeolite (ETS-10), having a large pore (8~10 ${\AA}$), was synthesized at 10.4 of pH, since TS-1 Zeolite (ETS-4), having a small pore (3~5 ${\AA}$), was synthesized at 11.5 of pH. Also the two materials simultaneously existed at the intermediate pH. Crystallization, physico chemical characteristics of synthesized TS-1 Zeolite were investigated by XRD, XRF, SEM and FT-IR techniques.

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Pervaporation Characteristics of Water/Ethanol Mixture through Hydrophilic Zeolite Membranes (친수성 제올라이트 분리막의 물/에탄올 투과증발 특성)

  • Ahn, Hyoseong;Lee, Hyeryeon;Lee, Yongtaek
    • Applied Chemistry for Engineering
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    • v.16 no.1
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    • pp.61-67
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    • 2005
  • Zeolite membranes show better thermal, mechanical, chemical stabilities than polymer membranes. Water was separated from water/ethanol mixtures by pervaporation using the NaA and the NaY zeolite membranes synthesized in our laboratory. The effects of concentration of ethanol at the feed side and temperature were studied on the permeation flux and separation factor of water. The separation factors obtained with the NaA zeolite membrane was found to be 1000 times higher than those obtained with the NaY. However, the water flux through the NaA zeolite membrane was observed to be lower than 1/2 of that through the NaY zeolite membrane.

The Development of Absorption Elements of Ceramic Rotors for the Semiconductor Clean Room System (반도체 클린룸용 세라믹 Rotor 흡착제 개발)

  • 서동남;하종필;정미정;문인호;조상준;김익진
    • Journal of the Korea Academia-Industrial cooperation Society
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    • v.1 no.2
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    • pp.33-40
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    • 2000
  • The present invention relates to a absorption rotor for removed VOC(volatile organic compound) and humidity in semiconductor clean room system. A absorption rotor medium is made by NaX zeolite and TS-1 zeolite formed on a honeycomb matrix of ceramic papers. The crystallization of NaX zeolite was hydrothermal reaction, and NaX zeolite crystals of a uniform particle size of 5$\mu$m were synthesized that NaX zeolite seed crystals (2~3$\mu$m) added in a batch composition at levels of 3~15 wt$\%$. The seeding resulted in an increase in the fraction of large crystals compared with unseeded batches and successfully led to a uniform NaX zeolite crystal. The microporous zeolite-type titanosilicate(TS-1) was synthesized by different of the reactant solution pH. The pH range of reactant solution has been changed from 10.0 to 11.5 TS-1 zeolite (ETS-10), having a large pore(8~10 $\AA$), was synthesized at 10.4 of pH, since TS-1 zeolite (ETS-4), having a small pore(3~5$\AA$), was synthesized at 11.5 of pH.

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Zeolite-Mediated Cation Exchange Enhances the Stability of mRNA during Cell-Free Protein Synthesis

  • Kim, You-Eil;Kim, Dong-Myung;Choi, Cha-Yong
    • Biotechnology and Bioprocess Engineering:BBE
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    • v.11 no.3
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    • pp.258-261
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    • 2006
  • The addition of zeolite particles enhances the stability of mRNA molecules in a cell-free protein synthesis system. When $20{\mu}g/{\mu}L$ of zeolite (Y5.4) is added to a reaction mixture of cell-free protein synthesis, a substantial increase in protein synthesis is observed. The stabilizing effect of zeolite is most dearly observed in an in vitro translation reaction directed by purified mRNA, as opposed to a coupled transcription and translation reaction. Upon the addition of zeolite in the in vitro translation reaction, the life span of the mRNA molecules is substantially extended, leading to an 80% increase in protein synthesis. The effect of zeolite upon the mRNA stability appears be strongly related to the cation exchange (potassium to sodium) reaction. Our results demonstrate the possibility of modifying this biological process using heterogeneous, non-biological substances in a cell-free protein synthesis system.

Synthesis of zeolite from power plant fly ash (화력발전소 비산회를 이용한 제올라이트합성)

  • 김재환;연익준;김광렬
    • Journal of environmental and Sanitary engineering
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    • v.12 no.1
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    • pp.49-58
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    • 1997
  • A study on the synthesis of zeolite from bituminous coal ESP fly ash as a raw material, which was emitted from the power plant, was carried out to reduce environmental problems and reuse of the industrial wastes. Bituminous coal fly ash was used as the source of silica and alumina. Zeolite was synthesized by hydrothermal reaction in aqueous NaOH solution with sodium aluminate as additive. The objective of this study is to elucidate the effect of several experimental variables on the synthesis of zeolite. The effects of preroasting temperature, mixing speed, leaching alkalinity, and molar ratio of Na$_{2}$O/SiO$_{2}$ and SiO$_{2}$/Al$_{2}$O of the products were investigated. The synthesized zeolite was proved to be NaA, which is known as 4A type, by comparing with SEM images, and X-ray diffraction analysis. And also we know that the transformation of zeolite A take places into other types of zeolites, i.e. Hydroxysodalite, zeolite P, with the variation of leaching alkalinity.

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Studies on the Effect of Zeolite Application on Rice Growth and yield in Tidal Land (간척지수도작에 있어서 Zeolite 시용효과에 관한 연구)

  • 손희명;김기준
    • KOREAN JOURNAL OF CROP SCIENCE
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    • v.22 no.2
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    • pp.37-41
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    • 1977
  • Zeolite was applied of the tidal land and its effect on growth and yield of the two rice varieties, Yushin and Jinheung, was studied. The salinity of the zeolite treated soil was lower than that of the control. The effect of zeolite on growth of rice was appeared at the maximum tillering stage. The remarkable effect of zeolite on grain yield appeared in the variety Yushin, an indiea type. The amount of 600kg/10a was recognized to be an optimum amountd of the zeolite application in the tidal land.

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Effects of Y-Zeolite as a Support on CO, $CC_3H_6$ Oxidation for Diesel Emission Control (디젤엔진 배출가스 저감을 위한 CO, $C_3H_6$의 산화반응에서 Y-제올라이트 담체의 영향)

  • 김문찬
    • Journal of Korean Society for Atmospheric Environment
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    • v.13 no.1
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    • pp.91-98
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    • 1997
  • Y-zeolite and ${\gamma}$-Al$_2$O$_3$ were used as supports on CO and $C_3$H$_{6}$ oxidation for diesel emission control. The catalysts composed of Pd and Pt as active components were wash coated on honeycomb type ceramic substrate. The oxidation of CO and $C_3$H$_{6}$ was carried out over prepared honeycomb in a fixed bed continuous reactor in the temperature range of 20$0^{\circ}C$~50$0^{\circ}C$ and 20,000 GHSV (h$^{-1}$ ). Surface area of Y-zeolite was larger than that of ${\gamma}$-Al$_2$O$_3$ due to channel structure of Y-zeolite. Therefore, high conversion of CO and $C_3$H$_{6}$ could be obtained because of good dispersion of active metals over Y-zeolite. The honeycomb used Y-zeolite as a support showed higher $C_3$H$_{6}$ conversion than that of ${\gamma}$-Al$_2$O$_3$ due to better cracking and isomerization activity of Y-zeolite. PdPt catalyst showed high conversion of CO and $C_3$H$_{6}$ at low temperature region, 20$0^{\circ}C$~30$0^{\circ}C$, for their synergy effects. PdPt/Y-Zeolite catalyst could achieve more than 80% conversion of $C_3$H$_{6}$ at 30$0^{\circ}C$. The use of Y-zeolite as a support increased CO and $C_3$H$_{6}$ conversion, and decreased SO$_2$ conversion very effectively. Y-zeolite found to have a good adaptability as a support for the diesel emission after treatment system.

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