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REFERENCE LINKING PLATFORM OF KOREA S&T JOURNALS
> Journal Vol & Issue
Korean Chemical Engineering Research
Journal Basic Information
Journal DOI :
The Korean Institute of Chemical Engineers
Editor in Chief :
KIM JAE JEONG
Volume & Issues
Volume 45, Issue 6 - Dec 2007
Volume 45, Issue 5 - Oct 2007
Volume 45, Issue 4 - Aug 2007
Volume 45, Issue 3 - Jun 2007
Volume 45, Issue 2 - Apr 2007
Volume 45, Issue 1 - Feb 2007
Selecting the target year
A Study on Physical Properties and Catalytic Combustion of Methane of Sr Hexaaluminate Prepared using 1-butanol and Ethylene Glycol
Shon, Jung-Min ; Woo, Seong-Ihl ;
Korean Chemical Engineering Research, volume 45, issue 3, 2007, Pages 209~214
hexaaluminate(Sr1-xLaxMnAl11O19-α) were prepared by sol-gel method of metal alkoxide with 1-butanol or ethylene glycol as a solvent. The physical properties of prepared hexaaluminates were examined by TG/DTA, XRD and N2 adsorption. When ethylene glycol was used as a solvent, the decomposition reaction and dehydroxylation reaction was observed above 400 ℃ and the temperature of the formation of a crystal structure of hexaaluminate was also increased resulting in small specific surface area and low catalytic activity of methane compared to Sr-hexaaluminate with 1-butanol.
Decomposition of 1,2-dichlorobenzene over Al-MCM-41
Yim, Jin-Heong ; Park, Young-Kwon ; Jeon, Jong-Ki ; Ko, Young-Soo ; Yoo, Kyung-Seun ;
Korean Chemical Engineering Research, volume 45, issue 3, 2007, Pages 215~218
equilibrium solubilization capacity of pure hydrocarbon oils by 2.5 wt% C12E8 nonionic surfactantsolution was measured at 30 °C by gas chromatography (GC) analysis. Experimental results indicated that the molar sol-ubilization ratio (MSR) for pure alkanes was found to decrease almost linearly with the alkane carbon number (ACN) ofthe hydrocarbon oil. For the binary mixture systems of the hydrocarbon oils both selective and nonselective solubiliza-tion behaviors were observed depending on the diference in carbon number of the two hydrocarbon oils. Equilibriumsolubilization tests for the two n-octane/n-nonane and n-nonane/n-decane mixture systems in C12E8 sugest slightly selective solubilization in favor of n-octane, but the small diference in solubilization rates between twohydrocarbon oils does not allow ruling out non-selective solubilization for these particular systems. This is certainly notthe case for the n-octane/n-decane mixture, for which selective solubilization was conclusively demonstrated by GCanalysis data.
Solubilization of Hydrocarbon Oils by
Nonionic Surfactant Solution
Lim, Jong-Choo ;
Korean Chemical Engineering Research, volume 45, issue 3, 2007, Pages 219~225
Effect of Additives on Solubilization of Sulfur Compounds in the Crude Oil by Tergitol Series Nonionic Surfactants
Han, Ji-Won ; Lim, Jong-Choo ;
Korean Chemical Engineering Research, volume 45, issue 3, 2007, Pages 226~233
this study, the effects of additives such as ionic surfactant and cosurfactant were studied on the solubi-tion of an ionic surfactant such as sodium oleate, potassium oleate, CTAB and DTAB did not enhance solubilizationcapacity of Tergitol series nonionic surfactant. On the other hand, the addition of a long-chain alcohol as a cosurfactantincreased the solubilization of sulfur compounds in the crude oil. The effect of alcohol was found to become reducedwith an increase in the amount of crude oil used mainly due to partitioning phenomena of an nonionic surfactant. Theenhancement of solubilizing capacity of Tergitol series nonionic surfactant with addition of a cosurfactant was associ-ated with a decrease in interfacial tension betwen crude oil and surfactant solution. The pH of Tergitol nonionic sur-factant solution did not afect the solubilization of sulfur compounds. Finaly, it was found that the growth of sulfur
Optimal Operation of Motor/Turbine Processes in Utility Plant
Oh, Sang-Hun ; Yeo, Yeong-Koo ;
Korean Chemical Engineering Research, volume 45, issue 3, 2007, Pages 234~241
supply of utilities and to meet utility needs in time. The main objective of motor/turbine processes is to manipulatesteam and electricity balances in utility plants. The optimal operation of motor/turbine processes is by far the mostimportant to improve economics in the utility plant. In order to analyse motor/turbine processes, we need steady statemodels for steam generation equipments and steam distribution devices as well as turbine generators. In addition heu-ristics concerning various operational situations are required. The motor/turbine optimal operation system is based onutility models and operational knowledgebase and provides optimal operating conditions when the amount of steamdemand from various steam headers is changed frequently. The optimal operation system also produces optimal selec-tion of driving devices for utility pumps to reduce operating cost.
Modeling of the Charge-discharge Behavior of a 12-V Automotive Lead-acid Battery
Kim, Ui-Seong ; Jeon, Se-Hoon ; Jeon, Won-Jin ; Shin, Chee-Burm ; Chung, Seung-Myun ; Kim, Sung-Tae ;
Korean Chemical Engineering Research, volume 45, issue 3, 2007, Pages 242~248
For an optimal design of automotive electric system, it is important to have a reliable modeling tool to predict the charge-discharge behaviors of the automotive battery. In this work, a two-dimensional modeling was carried out to predict the charge-discharge behaviors of a 12-V automotive lead-acid battery. The model accounted for electrochemical kinetics and ionic mass transfer in a battery cell. In order to validate the modeling, modeling results were compared with the experimental data of the charge-discharge behaviors of a lead-acid battery. The discharge behaviors were measured with three different discharge rates of C/5, C/10, and C/20 at operating temperature of 25 ℃. The batteries were charged with constant current of 30A until the charging voltage reached to a predetermined value of 14.24 V and then the charging voltage was kept constant. The discharge and charge curves from the measurements and modeling were in good agreement. Based on the modeling, the distributions of the electrical potentials of the solid and solution phases, the porosity of the electrodes, and the current density within the electrodes as well as the acid concentration can be predicted as a function of charge and discharge time.
Optimal Design of Generalized Process-storage Network Applicable To Polymer Processes
Yi, Gyeong-Beom ; Lee, Euy-Soo ;
Korean Chemical Engineering Research, volume 45, issue 3, 2007, Pages 249~257
The periodic square wave (PSW) model was successfully applied to the optimal design of a batch-storage network. The network structure can cover any type of batch production, distribution and inventory system, including recycle streams. Here we extend the coverage of the PSW model to multitasking semi-continuous processes as well as pure continuous and batch processes. In previous solutions obtained using the PSW model, the feedstock composition and product yield were treated as known constants. This constraint is relaxed in the present work, which treats the feedstock composition and product yield as free variables to be optimized. This modification makes it possible to deal with the pooling problem commonly encountered in oil refinery processes. Despite the greater complexity that arises when the feedstock composition and product yield are free variables, the PSW model still gives analytic lot sizing equations. The ability of the proposed method to determine the optimal plant design is demonstrated through the example of a high density polyethylene (HDPE) plant. Based on the analytical optimality results, we propose a practical process optimality measure that can be used for any kind of process. This measure facilitates direct comparison of the performance of multiple processes, and hence is a useful tool for diagnosing the status of process systems. The result that the cost of a process is proportional to the square root of average flow rate is similar to the well-known six-tenths factor rule in plant design.
Effect of Precipitation on Operation Range of the
Capture Process using Ammonia Water Absorbent
You, Jong-Kyun ; Park, Ho-Seok ; Hong, Won-Hi ; Park, Jong-Kee ; Kim, Jong-Nam ;
Korean Chemical Engineering Research, volume 45, issue 3, 2007, Pages 258~263
Ammonia water was investigated as a new absorbent of the chemical absorption process for the removal of CO2 in flue gas. The suitable range of ammonia water concentration and CO2 loading (mol CO2/mol NH3) were decided in the point of view of CO2 absorption capacity and NH4HCO3 precipitation. The absorption capacity of CO2 and the precipitation of NH4HCO3 in liquid phase were calculated by the Pitzer model for electrolyte solution. The CO2 absorption capacity of the ammonia water over 5 molNH3/kgH2O was higher than that of conventional amine absorbent. The CO2 loadings where precipitation occurred were decided at various absorbent concentrations. Theses values were higher than 0.5 in the concentration range of 5-14 molNH3/kgH2O at 293, 313 K. The absorber for the removal of CO2 in flue gas could be operated without NH4HCO3 precipitation by using high concentration of ammonia water below these CO2 loading values. The optimum temperature of the ammonia water absorbent for removal of CO2 in flue gas was 297-312 K depending on the concentration of ammonia water.
Synthesis of Nanostructures by Direct Growth of Carbon Nanotubes on Micron-sized Metal Fiber Filter and its Filtration Performance
Lee, Dong-Geun ; Park, Seok-Joo ; Park, Young-Ok ; Ryu, Jeong-In ;
Korean Chemical Engineering Research, volume 45, issue 3, 2007, Pages 264~268
The filtration performance of micron-sized metal fibrous filter was improved by synthesizing carbon nanotubes grown on the surface of metal fibers. The carbon nanotubes are grown with bush-like nanostructures covered around the micron-fibers or web-like nanostructures crossing between the fibers at different synthetic conditions. Filtration efficiency of CNT-metal-filter was measured and compared with the efficiency of the raw metal filter without CNTs. The developed CNT-metal-filter has higher filtration efficiency without significant difference in pressure drop compared with the conventional metal filter, which is because the carbon nanotubes function as the trap of pollutant nanoparticles.
The Optimum Stabilization Conditions of
-containing Pitch Fiber
Eom, Sang-Yong ; Lee, Chang-Ho ; Park, Kwan-Ho ; Ryu, Seung-Kon ;
Korean Chemical Engineering Research, volume 45, issue 3, 2007, Pages 269~276
pitch fibers were prepared and various stabilization variables were investigated by char-acterizations of the fibers and behaviors of TiO2 particles in the optimum stabilization conditions. When pitch fiber wasstabilized by air at the optimum condition, the fiber weight increased as an increase of the stabilization temperature and a2 concentration. The carbonization yield was 71~82 wt.%, showing a decrease of the yield with the TiO2increase caused by the catalytic activity of TiO2 to combustion. During the stabilization, newly developed carbonyl andcarboxyl groups were introduced on the fiber surface and cross-linking reactions were progressed resulting the thermo-setting property, which was verified by the replacement of hydrogen with oxygen. Pore size of the activated carbon fiberwas increased by an increase in TiO2 concentration. In the considerations of the aggregation behaviors of the TiO2 par-ticles, the optimum stabilization conditions of 0.5 wt.% TiO2 containing petroleum-based pitch fiber were suggested as280oC, 3 hr.
Adsorption Characteristics of Multi-component VOCs Including Poorly Adsorbable Chemicals on Activated Carbonaceous Adsorbents
Woo, Kwang-Jae ; Kim, Sang-Do ; Lee, Si-Hyun ;
Korean Chemical Engineering Research, volume 45, issue 3, 2007, Pages 277~285
adsorption characteristics of multi-component solvent vapors including poorly-adsorbable chemicalssuch as toluene-xylene-MEK and toluene-MEK-IPA on the activated carbonaceous adsorbents were investigated in astainless steel fixed bed of 10.2 cm ID and 50 cm in height in order to identify those carbons for elimering solvent vapors from industrial emision sources. The used activated carbonaceous adsorbents were peletized com-mercial activated carbons and activated carbon fiber. Breakthrough curves and adsorption capacity at atmosphericpressures were obtained. It has been found that non-polar and larger molecules have been adsorbed better than polar andsmaller molecules. In special, alcohols and ketones were poorly adsorbed caused by competitive adsorbability in multi-component mixture system. However, it could be overcome by profitable employment of organization of cooperativesystem which was composed of diferent porosity activated carbonaceous adsorbents appropriately.1. . ......... (VOCs; volatile organic compounds). ...
Esterification of Free Fatty Acids by Strong Acidic Ionic Liquids
Kim, Young-Joo ; Lee, Jin-Suk ; Kim, Deog-Keun ; Rhee, Young-Woo ; Han, Jeong-Sik ;
Korean Chemical Engineering Research, volume 45, issue 3, 2007, Pages 286~290
The esterification efficiency of several ionic liquids has been investigated to determine the feasibility for the conversion of free fatty acids to alkylester. Five ionic liquid catalysts having strong acidity, BPC[AlCl3], BMIM[Bf4], BMIM[Pf6], EMIM[Ntf2], BMIM[Otf], have been employed in this work. BPC[AlCl3] has the highest esterification efficiency among the ionic liquid catalysts. Over 90% conversion efficiency has been achieved in the esterification of the simulated used cooking oil by BPC[AlCl3] with two hours reaction time. Since BPC[AlCl3] has several advantages such as high esterification activity, ease of separation from reaction mixture and reusability after treatment procedure, it will be a promising catalyst for the conversion of free fatty acids to esters in waste fats.
Hydrolysis of Sulfur Mustard(HD) in Water
Lee, Yong-Han ; Lee, Jong-Chol ; Choi, Soo ; Hong, Dea-Sik ;
Korean Chemical Engineering Research, volume 45, issue 3, 2007, Pages 291~297
hydrolysis reaction of sulfur mustard(HD, bis 2-chloroethylsulfide), one type of the blister agents wasstudied in water to find the operation conditions which can convert HD into less toxic compounds. The reaction was pro-ceed into two steps. First, 10~20 wt% of HD was hydrolyzed in water at 90oC for 2 hr and aqueous sodium hydrox-ide solution(2.1 eq) was subsequently added to the reaction mixture at rom temperature. The efficiency of HDhydrolysis at this experimental conditions was greater than 99.99% and the final degradation products of HD were 68 wt% of
Treatment of TNT Red Water by the Ozone-based Advanced Oxidation Processes
Jun, Jun-Chul ; Kwon, Tae-Ouk ; Moon, Il-Shik ;
Korean Chemical Engineering Research, volume 45, issue 3, 2007, Pages 298~303
combinations of ozone based advanced oxidation processes were tested for the treatment of redwater (RW) containing recalcitrant chemical pollutants produced from 2,4,6-trinitrotoluene (TNT) manufacturing pro-cess. O3, UV/O3, UV/O3/H2O2, UV/O3/H2O2/Fe2+ processes were tested for the treatment of RW. The order of organicand color removal eficiency was found to be : O3 ≤UV/O3 < UV/O3/H2O2 < UV/O3/H2O2/Fe2+. The optimum condi-tions for the removal of organic and color in the UV/O3/H2O2/Fe2+ process were 0.053 g/min of ozone flow rate, 10 mMof H2O2 concentration and 0.1 mM of FeSO4 concentration. Organic and color removal efficiencies were 96 and 100 %respectively in the UV/O3/H2O2/Fe2+ process. tert-butyl alcohol (t-buOH) was used as the hydroxyl radical scavenger.Enhancement of hydroxyl radical production was achieved by the combination of ozone with several oxidants such asUV, H2O2, Fe2+.1. . .
An Experimental Analysis of Hydrate Production using Multi-Well, Plate-Type Cell Apparatus
Bae, Jae-Yu ; Sung, Won-Mo ; Kwon, Sun-Il ;
Korean Chemical Engineering Research, volume 45, issue 3, 2007, Pages 304~309
this study, the『Multi Well Plate-type cell Apparatus』was designed and setup for performing the producing experiments of methane hydrate by depressurization, heat stimulating methods. In order to characterizing the producing mechanism of hydrate through porous materials, the experiments for various producing methods have been conducted with the aid of the apparatus which has high permeability. In the experimental result of depressurization method, the pressure is temporarily increased unlikely conventional gas reservoir due to the sourcing effect of hydrate dissociation in the pore. Meanwhile, the temperature is decreased because of the endothermic reaction while hydrate is dissociated. In the experimental results of heat stimulating method, the dissociation in depressurization method is more slowly processed than that in thermal method, and hence, its gas production is lower. In the case of production right after heating, hydrate is dissociated only near injecting point and the permeability becomes greater at that area only. It infers that the more gas is produced during relatively earlier producing period. Since then, the hydrate is more slowly dissociated than the case of production after heating and soaking. This time, the performances of pressure and production obtained by thermal method have been analyzed in order to investigate the effect of soaking time on gas recovery. As a result, the gas recoveries in the case of 2 min and 4 min soaking are higher than case in 6 min soaking. This is reason that hydrate is reformed due to the decrease of temperature. It is expected that the experimental results obtained in this work may be more clearly explained by utilizing the lower permeable porous system with the greater hydrate saturation.