May 18, 2007 at 12:51 pm (Physical chemistry, Plasma environment)
Antonius Indarto, Dae Ryook Yang, Jae-Wook Choi, Hwaung Lee, Hyung Keun Song
Chemical Engineering Communications, 2007, 19(8): 1111-1125
Abstract:
The goal of this work is to investigate the role of existing C2 compounds in the plasma reactions of carbon tetrachloride (CCl4) decomposition. The experiment of CCl4 decomposition was carried out by gliding arc plasma. The decomposition products were dominated by CO, CO2, and Cl2. The conversion of CCl4 into Cl2 and (CO + CO2) reaches ∼50% and ∼40%, respectively. Other chlorinated compounds were suspected to be produced, such as COCl, COCl2, and C2 compounds. In order to prove the existence of those compounds, for example, chlorinated C2 compounds, a kinetic simulation was performed and cross-checked with the experimental results to clarify the reactions mechanism.
Keywords: CCl4 decomposition; Gliding arc; Plasma; Reaction mechanism
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May 18, 2007 at 12:40 pm (Plasma environment)
Antonius Indarto, Jae-Wook Choi, Hwaung Lee, Hyung Keun Song
International Journal of Green Energy, 2006, 3(3), 309 – 321
Abstract:
Decomposition of dichloromethane (CH2Cl2) using a gliding plasma was examined and reported in this paper. The effects of initial concentrations of CH2Cl2, total gas flow rates, and input frequency have been studied to evaluate the performance of gliding arc on CH2Cl2 decomposition. Using atmospheric pressure air as the carrier gas, experimental results indicate that the maximum conversion of CH2Cl2 was 95.1% at a total gas flow rate of 180 L/hr containing 1% by volume of CH2Cl2. The reaction occurred at an exothermic condition and gaseous products are dominated by CO, CHCl3, and Cl2. CO2 and CCl4 are also detected in the product stream in small amounts. The conversion of CH2Cl2 increases with the increasing applied voltage and decreasing total gas flow rate.
Keywords: plasma, gliding arc, CH2Cl2 decomposition
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May 18, 2007 at 12:33 pm (Plasma chemistry)
Antonius Indarto, Jae-Wook Choi, Hwaung Lee, Hyung Keun Song
Journal of Natural Gas Chemistry, 2005, 14(1): 13-21
Abstract:
Plasma methane (CH4) conversion in gliding arc discharge was examined. The result data of experiments regarding the performance of gliding arc discharge were presented in this paper. A simulation which is consisted some chemical kinetic mechanisms has been provided to analyze and describe the plasma process. The effect of total gas flow rate and input frequency refers to power consumption have been studied to evaluate the performance of gliding arc plasma system and the reaction mechanism of decomposition. Experiment results indicated that the maximum conversion of CH4 reached 50% at the total gas flow rate of 1 L/min. The plasma reaction was occurred at the atmospheric pressure and the main products were C (solid), hydrogen, and acetylene (C2H2). The plasma reaction of methane conversion was exothermic reaction which increased the product stream temperature around 30-50.
Keywords: plasma, gliding arc, methane conversion, reaction mechanism
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May 18, 2007 at 12:20 pm (Plasma environment)
Hyung Keun Song, Jae-Wook Choi, Hwaung Lee, Antonius Indarto
Toxicological & Environmental Chemistry, 2005, 87(4): 509 – 519
Abstract:
The decomposition of chloroform (CHCl3) diluted in air was studied. The experiment was carried out by using a gliding arc plasma. Different values of initial concentrations of chloroform, total gas flow rates, and input power frequencies have been used to investigate this effects on the conversion reaction products both qualitatively and quantitatively. Experimental results indicate that the maximum conversion of chloroform was 97% at a total gas flow rate of 180 L h-1 containing 1% chloroform. Using air as carrier gas, decomposition of CHCl3 produces CCl4, CO2, CO, and Cl2 as the main products. Small amounts of HCl and COCl2 are also detected. Liquid products were also produced.
Keywords: Plasma; gliding arc plasma; chloroform; decomposition
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May 18, 2007 at 12:13 pm (Drying)
Antonius Indarto, Yudy Halim, Parikesit Partoputro
Experimental Heat Transfer, 2007, 20: 277-287
Abstract:
This paper presents a mathematical model approchment to study the drying phenomena of solid particle in a pneumatic (flash) dryer. The analysis is focused on the pneumatic momentum, mass, and heat balance of the solid particle when it moves inside the reactor. A fixed bed fluidization model was used to calculate the forces balance on the single solid particle. By solving mass and heat balance , the water/liquid removal efficiency can be calculated. To validate the model calculations, we conducted a set of experiments and compared the simulation with the experimental data. High moisture natural concrete sand, the additional material for portland cement, was used and dried along a vertical cylindrical tube with length of 2 m and diameter of 6.68 cm. The drying gas was supplied by a high capacity air blower which was connected to the burner to produce 120 m3/hr of drying gas with maximum temperature of 800oC.
Keywords: pneumatic drying, pneumatic transport, mass-heat balance, pneumatic drying model
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