• Title/Summary/Keyword: 반응차수

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The Purification Characteristics of Reactive Soil-Bentonite Landfill Liner (혼합반응 차수재의 오염정화특성)

  • 김학문
    • Journal of the Korea Academia-Industrial cooperation Society
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    • v.4 no.4
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    • pp.398-403
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    • 2003
  • The purpose of this paper is to investigate purification characteristic of soil-bentonite landfill liner and to develop a desirable liner system. In order to clarify the purification characteristics, high pressure column tests using soil-bentonite, reactive soil-bentonite and reactive bentomat were carried out in the presence of water and leachate. The test results indicated that the significant amount of NH$_3$-N, Pb and Cu was removed through the reactive soil-bentonite liner system.

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Effect of Surface Condition of Soil Particles According to Water Content on Spectral Information of Soils (지반의 함수비에 따른 흙 입자의 표면조건이 분광정보에 미치는 영향)

  • Kim, Ju-Hun;Hong, Gigwon;Park, Jeong-Jun
    • Proceedings of the Korean Society of Disaster Information Conference
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    • 2022.10a
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    • pp.345-346
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    • 2022
  • 본 논문에서는 유류오염사고 발생에 의해 지반 내에 오염물이 유출되었을 때, 오염물 확산방지를 목적으로 차수재의 차수성능 평가를 위한 수치해석을 수행하였다. 해석결과, 차수재의 차수효과에 의해 동일한 투수계수 및 관측위치 조건에서 오염물 접촉시간 경과에 따른 농도가 크게 감소한 것을 확인하였다.

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Investigation on Desorption Reaction and Heating Value of Used Activated Carbons Collected from VOC Adsorption Towers (휘발성 유기화합물 흡착탑 폐활성탄의 탈착반응 및 열량특성 연구)

  • Yoon, Sung-Min;Kim, Joo-Yeon;Park, Kun-Yik;Yoon, Soo-Kyung;Kil, In-Sub;Park, Hui-Jae;Rhee, Young-Woo
    • Clean Technology
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    • v.16 no.1
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    • pp.33-38
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    • 2010
  • The characteristics of desorption reaction and the heating values of used activated carbons collected from the companies of Shiwha/Banwal industrial complex were investigated. The desorption characteristics of used activated carbons were analyzed based on the data obtained from a thermogravimetric analyzer. The activation energies and reaction orders for desorption reaction of used activated carbons were calculated by employing Freeman-Carroll method. Heating values of volatile organic compounds(VOC) desorbed from used activated carbons were estimated based on the data obtained from a total hydrocarbon analyzer. It was found that the reaction orders of desorption of used activated carbons were 0.1~0.8, their desorption activation energies, 6.9~26.4 kJ/mol, and VOC heating values, 0.4~10.7 kcal/kg.

Study on Desorption Reaction of VOC Produced from Manufacturing of Chemical Products (화학제품 제조업에서 발생한 VOC의 탈착반응 연구)

  • Park, Kuny-Ik;Yoon, Sung-Min;Kim, Joo-Yeon;Kil, In-Sub;Park, Hi-Jae;Rhee, Young-Woo
    • Applied Chemistry for Engineering
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    • v.21 no.5
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    • pp.505-508
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    • 2010
  • The characteristics of desorption reaction for spent activated carbon produced from the manufacture of other chemical products in Shiwha/Banwal industrial complex were investigated. TGA (Thermogravimetric Analyzer) was used to study for characteristics of desorption and kinetics. Then Friedman method and Freeman-carroll method were used to find the activation energy and the order of reaction. Activation energy by Friedman method was 24.82~46.49 kJ/moL. And then activation energy and order of reaction by Freeman-carroll method were 8.77~32.26 kJ/moL and 0.11~1.69.

Thermodynamic cheracteristics of micro algae for energy conversion (조류 부산물의 에너지 전환을 위한 열역학 특성 고찰)

  • Lee, See-Hoon;Seo, Myung-Won;Kim, Sang-Don
    • 한국신재생에너지학회:학술대회논문집
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    • 2009.06a
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    • pp.447-450
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    • 2009
  • 2세대 바이오연료 생산에 적용되는 미세 조류의 열화학적 전환 특성을 열천칭 반응기를 이용하여 고찰하였다. 반응 온도 (500 - $800^{\circ}C$)와 수분 함량 (0-60wt.%)을 변수로 하였으며 미세조류로서 가장 널리 이용되는 클로렐라를 이용하였다. 대표적인 열화학적 전환 반응인 열분해, 부분 산화 (5%), 연소 반응을 고찰하였으며 실험 영역에서 반응온도 및 산소의 분압이 증가함에 따라 탄소 전환율이 증가하였으며 Shrinking-core model을 사용하여 반응 차수를 구하였다. 가스화 영역인 부분 산화 (5%) 조건에서의 activation energy와 frequency factor 값은 각각 19.60 kJ/mol, $2.47{\times}10-1\;s^{-1}$ 이었으며 산소 분압에 의한 반응 차수는 0.209 임을 확인하였다. 수분 함량에 따른 클로렐라의 반응 특성을 살펴보면, 수분 함량이 증가함에 따라 탄소 전환율과 반응성이 감소하는 경향이 발견되었다. 열분해의 경우, 건조 시료에 비하여 수분 함량이 늘어남에 따라 탄소 전환율과 반응성이 급격하게 감소하는 경향을 보였다. 반면, 부분 산화(5%) 및 연소의 경우에는 건조 시료, 수분 함량 20, 40% 시료의 탄소 전환율과 반응성은 거의 일정하였다. 그러나 수분 함량이 60%가 되면서 탄소 전환율 및 반응성이 급격히 떨어졌다.

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Photopolymerization Kinetics of Urethane-acrylate Oligomer (우레탄-아크릴레이트 올리고머의 광경화 거동)

  • Kim, In-Beom;Song, Bong Jin;Lee, Myung Cheon
    • Applied Chemistry for Engineering
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    • v.17 no.1
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    • pp.33-36
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    • 2006
  • The kinetics of photopolymerization of urethane-acrylate oligomer which has many applications in photopolymerizable adhesives was analysed to investigate the influence of polymerization temperature and functionality of oligomer using the autocatalytic model. It was revealed that the maximum polymerization rate decreased as the polymerization temperature increased. The reaction rate constant, k, showed little change with the increase in polymerization temperature, while exponents m and n exhibited an increase. These results could be related to the diffusion and mobility restriction of reactive species during the cross-linking reaction. The decrease in photopolymerization rate with increase of temperature was mainly controlled by the reaction order n.

Sulfation Reaction Kinetics of Pulverized Korean Dolomite and Limestone using Thermogravimetric Analyses (열중량분석을 이용한 국내산 미분 백운석과 석회석의 황화 반응 특성 연구)

  • 박영철
    • Journal of Energy Engineering
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    • v.7 no.2
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    • pp.216-222
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    • 1998
  • Thermogravimetric analyses were conducted by isothermal technique in order to characterize the sulfation reaction of calcined sorbents such as Tanyang dolomite, Yongwol dolomite, Tanyang limestone, and Yongwol limestone. Sulfation reaction for 0.08 mm in particle diameter were carried out with respect to various factors.; isothermal reaction temperatures (650~85$0^{\circ}C$), SO$_2$ concentration (0.38~1%), and oxygen concentration (1.2~6.7%). Measured reaction orders of SO$_2$ concentration, oxygen concentration, and activation energy were 0.3~2.2, 0.22~0.51 and 23.6~36 kJ/mol, respectively. The kinetic equations of sulfation reaction of calcined dolomites were correlated with various factors.

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The Characteristics of the Dehydration Reaction and the Durability for the Thermal Decomposition in Na2B4O7·10H2O/Na2B4O7·5H2O System (Na2B4O7·10H2O/Na2B4O7·5H2O 계의 열분해 탈수반응 및 내구성 고찰)

  • Choi, Ho-Sang;Park, Young-Tae
    • Applied Chemistry for Engineering
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    • v.10 no.6
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    • pp.885-888
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    • 1999
  • This study was carried out to determine the reaction kinetic constant of the dehydration - thermal decomposition of $Na_2B_4O_7{\cdot}10H_2O/Na_2B_4O_7{\cdot}5H_2O$ and to investigate the durability during the repeated use of a chemical heat-storage material and the reproducibility of reaction system. The order of the dehydration reaction was 1st-order. The reaction rate was directly proportional to a partial pressure difference of water steam. The kinetic constant was 0.27 and the reproducibility of dehydration reaction for a kinetic constant and a reaction order was excellent. The activity variation in the durability test of a chemical heat-storage material was within range of ${\pm}5%$ during the repeatedly use in several times.

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Effect of Reaction Conditions for n-Butane Dehydrogenation over Pt-Sn/θ-Al2O3 Catalyst (Pt-Sn/θ-Al2O3 촉매상에서 반응조건에 따른 n-부탄의 탈수소화 반응)

  • Cho, Kyung-Ho;Kang, Seong-Eun;Park, Jung-Hyun;Cho, Jun-Hee;Shin, Chae-Ho
    • Clean Technology
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    • v.18 no.2
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    • pp.162-169
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    • 2012
  • Pt-Sn/${\theta}-Al_2O_3$ catalyst for n-butane dehydrogenation reaction was prepared by incipient wetness method. To confirm the physicochemical properties of Pt-Sn/${\theta}-Al_2O_3$ catalyst, the characterization was performed using X-ray diffraction (XRD), $N_2$ sorption analysis, temperature programmed desorption of $NH_3$ ($NH_3$-TPD), temperature programmed reduction of $H_2$ ($H_2$-TPR) techniques. Also, the catalytic activities of Pt-Sn/${\theta}-Al_2O_3$ for n-butane dehydrogenation was tested as a function of pretreatment temperature, pretreatment time, reaction temperature, and the partial pressure of n-butane and hydrogen. The sum of selectivities to n-butenes consisting of 1-butene, cis-2-butene, and trans-2-butene was almost constant 95% in the range of conversion of n-butane 5-55%. The activation energy calculated from Arrhenius equation was $82.4kJ\;mol^{-1}$ and the reaction orders of n-butane and hydrogen from Power's law were 0.70 and -0.20, respectively.

Investigation on Desorption Characteristics of VOCs Adsorbed on used Activated Carbons Collected from Painting Process (도장공정에서 수거한 폐활성탄에 흡착된 VOCs의 탈착특성 연구)

  • Kim, Joo Yeon;Yoon, Sung Min;Park, Kunyik;Yoon, Soo Kyung;Kil, In Sub;Park, Hui Jae;Rhee, Young-woo
    • Korean Chemical Engineering Research
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    • v.48 no.6
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    • pp.752-756
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    • 2010
  • Desorption reaction characteristics of the used activated carbons collected from painting process in Shiwha/Banwal industrial complex were investigated. Thermogravimetric analyzer was used to investigate the desorption characteristics. Activation energies and reaction orders for desorption reaction characteristics of used activated carbons were estimated by employing Friedman method and Freeman-Carroll method. In the used activated carbons collected from painting process, it was found that the activation energies were 20.6~43.2 kJ/mol in Friedman method and 12.3~26.5 kJ/mol in Freeman-carroll method, and reaction orders were 0.1~1.7.