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Reaction Pathways of Methane Conversion in Dielectric-Barrier Discharge
Kim, Seung-Soo,Lee, Hwaung,Na, Byung-Ki,Song,Hyung Keun 한국화학공학회 2003 Korean Journal of Chemical Engineering Vol.20 No.5
Conversion of methane to C₂, C₃, C₄ or higher hydrocarbons in a dielectric-barrier discharge was studied at atmospheric pressure. Non-equilibrium plasma was generated in the dielectric-barrier reactor. The effects of applied voltage on methane conversion, as well as selectivities and yields of products were studied. Methane conversion was increased with increasing the applied voltage. Ethane and propane were the main products in a dielectric-barrier discharge at atmospheric pressure. The reaction pathway of the methane conversion in the dielectric-barrier discharge was proposed. The proposed reaction pathways are important because they will give more insight into the application of methane coupling in a DBD at atmospheric pressure.
Kinetics of the Methane Decomposition in a Dielectric-Barrier Discharge
Kim, Seung-Soo,Lee, Hwaung,Choi, Jae-Wook,Na, Byung-Ki,Song, Hyung Keun 한국공업화학회 2003 Journal of Industrial and Engineering Chemistry Vol.9 No.6
The effect of residence time on methane conversion, selectivities, and yields of products were studied in this work. Methane conversion was increased with the increase of the residence time. The maximum selectivities of ethane and propane were 29.5% and 14.0%, respectively, and they were the main products of methane conversion. Kinetics of the methane decomposition to C₂, C;, and C₄ in a dielectric-barrier discharge was studied at atmospheric pressure, and the kinetic model of methane decomposition was proposed. The calculated values of the product distribution from kinetic model were found to be in agreement with the experimental data. From the proposed model, the reaction rate constant h (C₂H₄ - C₃H_8) was the highest.
Treatment of Dichloromethane Using Gliding Arc Plasma
Indarto, Antonius,Choi, Jae-Wook,Lee, Hwaung,Keun Song, Hyung Taylor and Francis 2006 INTERNATIONAL JOURNAL OF GREEN ENERGY Vol.3 No.3
<P>Decomposition of dichloromethane (CH<SUB>2</SUB>Cl<SUB>2</SUB>) using a gliding plasma was examined and reported in this paper. The effects of initial concentrations of CH<SUB>2</SUB>Cl<SUB>2</SUB>, total gas flow rates, and input frequency have been studied to evaluate the performance of gliding arc on CH<SUB>2</SUB>Cl<SUB>2</SUB> decomposition. Using atmospheric pressure air as the carrier gas, experimental results indicate that the maximum conversion of CH<SUB>2</SUB>Cl<SUB>2</SUB> was 95.1% at a total gas flow rate of 180 L/hr containing 1% by volume of CH<SUB>2</SUB>Cl<SUB>2</SUB>. The reaction occurred at an exothermic condition and gaseous products are dominated by CO, CHCl<SUB>3</SUB>, and Cl<SUB>2</SUB>. CO<SUB>2</SUB> and CCl<SUB>4</SUB> are also detected in the product stream in small amounts. The conversion of CH<SUB>2</SUB>Cl<SUB>2</SUB> increases with the increasing applied voltage and decreasing total gas flow rate.</P>
Rapid Pressure Swing Adsorption (RPSA) 공정을 이용한 공기에서의 산소 분리
최재욱(Jae-Wook Choi),이화웅(Hwaung Lee),송형근(Hyung Keun Song),서성섭(Sung-Sup Suh),나병기(Byung-Ki Na) 한국청정기술학회 2008 청정기술 Vol.14 No.1
RPSA 공정은 기체 혼합물을 흡착법을 이용하여 분리하는 주기적인 공정으로 일반적인 방법의 적용이 어려운 기체 혼합물의 분리에 적용될 수 있다. 공기로부터 분리된 산소는 의료용 산소발생기, 생물학적 폐수처리 공정 등에 이용되어 왔으며 다른 공정에의 적용이 점차 확대되고 있다. RPSA 공정은 한 개의 흡착탑을 이용하여 분리하므로 기존의 PSA공정에 비해서 장치의 구성이 간단하다. 본 연구에서는 공기로부터 산소를 농축하는 RPSA 공정의 기초연구를 통하여 산소농축공정 개발을 위한 기초자료와 제반 기술을 확립하고자 한다. RPSA (Rapid Pressure Swing Adsorption) is a cyclic process which can be used to separate gas mixtures by adsorption method. Oxygen which is separated from air is used to the medical oxygen generator and biological wastewater treatment process. RPSA uses only one adsorption bed, so it is very simple to operate compared to conventional PSA process. In this work experimental parameters were examined with RPSA setup and parameters for the oxygen separation from air were obtained.