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REFERENCE LINKING PLATFORM OF KOREA S&T JOURNALS
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Korean Chemical Engineering Research
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Journal DOI :
The Korean Institute of Chemical Engineers
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Volume & Issues
Volume 46, Issue 6 - Dec 2008
Volume 46, Issue 5 - Oct 2008
Volume 46, Issue 4 - Aug 2008
Volume 46, Issue 3 - Jun 2008
Volume 46, Issue 2 - Apr 2008
Volume 46, Issue 1 - Feb 2008
Selecting the target year
Colloidal Engineering for Nano-Bio Fusion Research
Moon, Jun-Hyuk ; Yi, Gi-Ra ; Lee, Sang-Yup ; So, Jae-Hyun ; Kim, Young-Seok ; Yoon, Yeo-Kyun ; Cho, Young-Sang ; Yang, Seung-Man ;
Korean Chemical Engineering Research, volume 46, issue 4, 2008, Pages 647~659
Colloids are a heterogeneous system in which particles of a few nanometers to hundreds micrometers in size are finely dispersed in liquid medium, but show homogeneous properties in macroscopic scale. They have attracted much attention not only as model systems of natural atomic and molecular self-assembled structures but also as novel structural materials of practical applications in a wide range of areas. In particular, recent advances in colloidal science have focused on nano-bio materials and devices which are essential for drug discovery and delivery, diagnostics and biomedical applications. In this review, first we introduce nano-bio colloidal systems and surface modification of colloidal particles which creates various functional groups. Then, various methods of fabrication of colloidal particles using holographic lithography, microfluidics and virus templates are discussed in detail. Finally, various applications of colloids in metal inks, three-dimensional photonic crystals and two-dimensional nanopatterns are also reviewed as representative potential applications.
Solvent Extraction of Tanshinone IIA from Salvia Miltiorrhiza Bunge
Wan, Xiaolong ; Jung, Yong-An ; Row, Kyung-Ho ;
Korean Chemical Engineering Research, volume 46, issue 4, 2008, Pages 660~664
In this work, analytical HPLC was utilized to obtain Tanshinone IIA (TIIA) from Salvia Miltiorrhiza Bunge (SMB). The optimum operating conditions were experimentally determined to analyze the TIIA in the pretreated extract. SMB was extracted with the various organic solvents of methanol, ethyl acetate, and ethanol, then the extract was analyzed to compare the amount of TIIA. From the results, the methanol showed the best extraction efficiency of TIIAd. The analysis by C18 column was performed. The mobile phase was composed of methanol and water, and the isocratic elution mode was mainly applied. 2.154 μg of TIIA/mg of SMB powder was extracted with methanol.
Propylene Epoxidation Using Ti-MCM-22 Catalyst
Yang, Seung-Tae ; Ban, Han-Ju ; Kim, Se-Young ; Ahn, Wha-Seung ;
Korean Chemical Engineering Research, volume 46, issue 4, 2008, Pages 665~668
Propylene epoxidation by H2O2 (30% aqueous) as oxidant was studied in a semi-batch reactor using Ti-MCM-22 catalyst: Effects of reaction temperature, pressure, catalyst loading, solvent, and H2O2 concentration on H2O2 conversion (limiting reagent) were investigated. Product inhibition by propylene oxide was confirmed. Ti-MCM-22 maintained virtually the same catalytic performance over the 5 repeated cycles.
Microencapsulation of Surface-modified Carbon Black by Miniemulsion Polymerization
Jang, Heang-Sin ; Hong, Jin-Ho ; Lee, Jeong-Woo ; Shim, Sang-Eun ;
Korean Chemical Engineering Research, volume 46, issue 4, 2008, Pages 669~675
Carbon black has been widely used in composites, tonor resin, and ink materials. Since carbon black readily agglomerates, it is important to disperse carbon black in real applications. Aiming to improve dispersion stability, carbon black was chemically oxidized to possess hydroxyl groups using a phase transfer catalyst at room temperature. The modified carbon black (CB-OH) was grafted by a silane coupling agent, p-methylacryloxypropyltrimethoxysilane, to carry teminal vinyl groups. The modified carbon black was subsequently used in miniemulsion polymerization to achieve encapsulted core-shell structure. Finally, well-encapsulated carbon black by polymer was obtained in the size range of 100-500 nm. Throughout the polymerization, the effects of surface modification, types of monomers, initiators, and emulsifiers were investigated.
Effect of Deposition Parameters on the Properties of TiN Thin Films Deposited by rf Magnetron Sputtering
Lee, Do-Young ; Chung, Chee-Won ;
Korean Chemical Engineering Research, volume 46, issue 4, 2008, Pages 676~680
TiN thin films were deposited on a SiO2(2000A)/Si substrate by radio-frequency(rf) magnetron sputtering. TiN films were prepared under varying N2 concentration in N2/Ar gas mix, rf power and gas pressure, and investigated in terms of deposition rate, resistivity and surface morphology. As N2 concentration increased, the deposition rate and the surface roughness of the films decreased and the resistivity increased. With increasing rf power, the deposition rate increased but the resistivity was decreased. As gas pressure increased, little change in deposition rate was obtained but the resistivity rapidly increased. TiN film with resistivity of 2.46×10-4 Ωcm at 1 mTorr was formed. It was observed that there existed a correlation between the deposition rate and resistivity. In particular, the gas pressure has a strong influence on the resistivity of thin films.
Separation Characteristics of Mandelic Acid in Kromasil HPLC Column
Kim, Byung-Lip ; Kim, Jong-Min ; Kim, Woo-Sik ; Kim, In-Ho ;
Korean Chemical Engineering Research, volume 46, issue 4, 2008, Pages 681~685
Chiral separation of racemic mandelic acid was achieved on a Kromasil KR100-5CHI-TBB column. Some chromatographic parameters (resolution, number of theoretical plates, capacity factor) are calculated under different separation conditions such as changes of mobile phase compositions (hexane/t-BME = 85/15 - 10/90) as well as formic acid concentrations for adjusting pH (0.1, 0.5, 1.0 v/v%). Flow rate versus number of theoretical plates was compared to evaluate column efficiency. To determine the adsorption isotherms, PIM (Pulse Input Method) was carried out. At the concentrations of racemic mandelic acid between 0.1 and 0.3 mg/ml, L- and D-mandelic acids have the same retention times of 8.8 and 9.4 min respectively. Mandelic acid isotherms show a linear form under the concentrations of 0.3 mg/ml with eluent (hexane/t-BME = 75/25). As the concentrations of mandelic acids increase, nonlinear Langmuir isotherms were observed as CS, L= 3.358CM, L/(1+0.0897CM, L) for L-mandelic acid and, CS, D = 3.692CM, D/(1+0.1457CM, D) for D-mandelic acid.
Self-assembly of ZnO Stripes Prepared by Anodization in an Ethanolic Sulfuric Acid
Kim, Sung-Joong ; Choi, Jin-Sub ;
Korean Chemical Engineering Research, volume 46, issue 4, 2008, Pages 686~691
There are no many research reports on the preparation of ZnO by electrochemical oxidation since the zinc oxide is very easily dissolved in an acidic or basic environment, even though zinc oxides have attracted many attentions because of their optical/electrical properties. In this paper, we describe the fabrication of self-ordered stripes of ZnO by anodization of Zn in an ethanolic sulfuric acid. The formation of stripes of ZnO originating from Zn is attributed to water-selective dissolution of ZnO during anodization. We study in detail the effects of concentration of H2SO4, applied potential, anodization time, and addition of a small amount of water on the fabrication of stripes of ZnO. Mechanisms for the fabrication of ZnO stripes are discussed in terms of the above-mentioned effects.
Process of the Selective Production of 1-Butene through Positional Isomerization from 2-Butenes
Ko, Min-Su ; Jeon, Jong-Ki ; Cho, Jung-Ho ; Lee, Seong-Jun ; Lee, Jae-Ho ;
Korean Chemical Engineering Research, volume 46, issue 4, 2008, Pages 692~696
There is not much method of using C4 Raffinate III, despite having high olefin contents. The majority of the C4 Raffinate III have been converted into n-butane through hydrogenation, and sold as LPG. The C4 Raffinate III is rich 2-butenes with very low isobutene and isobutene contents. The 2-butenes are converted into 1-butene in the vicinity of thermodynamic equilibrium yield through positional isomerization with n-almumina catalyst calcinated at 400~600 ℃. The overall process is composed of isomerization-reactor, de-1-buteneizer to prepare the reactants and to enrich reactive products, and 1-butene column to product a high purity 1-butene. The production of 1-butene increases by 40~60 wt% with the selective positional isomerization from the existing separation method.
Development of a Formic Acid Fuel Cell Anode by Multi-layered Bismuth Modification
Kwon, Young-Kook ; Uhm, Sung-Hyun ; Lee, Jae-Young ;
Korean Chemical Engineering Research, volume 46, issue 4, 2008, Pages 697~700
The underpotential deposited Bi on Pt(Biupd /Pt) anode for formic acid fuel cells (FAFCs) was developed using multi-layered preparation method for better electrocatalytic utilization of Pt. The electron probe microanalysis (EPMA) result indicated that Biupd remains through the catalyst layer during stability test. In performance test, the multilayered Biupd on Pt black showed superior performance by approximately 200 mV at current density of 150 mA/cm2 compared with PtRu black anode catalyst. Based on preparation condition of Biupd /Pt black, carbon supported Biupd /Pt/C electrode was prepared and it showed enhanced performance and stability.
Preparation of Nickel Nanopowder using the Transferred Arc Plasma for MLCCs
Jung, Da-Woon ; Oh, Seung-Min ; Park, Dong-Wha ;
Korean Chemical Engineering Research, volume 46, issue 4, 2008, Pages 701~706
Nano-sized nickel powders were prepared by evaporating the bulk nickel metarial using transferred arc thermal plasma. Nitrogen gases are easily dissociated to atomic nitrogen in thermal plasma and they are quickly dissolved in molten nickel. Super-saturated atomic nitrogen in molten nickel is recombined to nitrogen gas because of the relatively low temperature of nickel surface. Generally, the recombine reaction of atomic nitrogen is exothermic, so bulk nickel is quickly evaporated to nickel vapor due to the thermal energy of recombine reaction. The particle size of nickel powder was controlled by N2 used as the diluting gas. It was observed that as the diluting gas flow rate was increase, the particle size was decreased and the particle size distribution was narrowed. The average particle size at 250 l/min of the diluting gas was 202 nm analyzed by means of the particle size analyzer (PSA).
Characteristics of Minimum Fluidization Velocity and Pressure Fluctuations in Annular Fluidized Beds
Son, Sung-Mo ; Kim, Uk-Yeong ; Shin, Ik-Sang ; Kang, Yong ; Choi, Myung-Jae ;
Korean Chemical Engineering Research, volume 46, issue 4, 2008, Pages 707~713
Characteristics of minimum fluidization velocity and pressure fluctuations were investigated in an annular fluidized bed whose diameter was 0.102 m and 2.0 m in height. Effects of gas velocity, particle size and bed temperature on the minimum fluidization velocity and pressure fluctuations were examined. The values of minimum fluidization velocity obtained by means of three different methods were very similar each other. The correlation dimension could be a quantitative parameter for expression the resultant complex behavior of gas and solid mixture in the annular fluidized bed. The value of correlation dimension increased with increasing gas velocity, fluidized particle size and temperature in the bed. The minimum fluidization velocity could be determined by means of correlation dimension of pressure fluctuations as well as pressure drop in the bed and standard deviation of pressure fluctuations. The minimum fluidization velocity increased with increasing particle size but decreased with increasing bed temperature in annular fluidized beds. The minimum fluidization velocity was well correlated in therms of correlation dimension as well as operating variables within experimented conditions of this study.
Selecting Decision Variable for a Plant-wide Optimization
Jeong, Chang-Hyun ; Jang, Kyung-Soo ; Han, Chong-Hun ;
Korean Chemical Engineering Research, volume 46, issue 4, 2008, Pages 714~721
Preparation of Silica/collagen Microsphere Composit Doped with Silver Nanoparticles
Jung, Hyo-Jung ; Kim, Yeon-Bum ; Chang, Yoon-Ho ;
Korean Chemical Engineering Research, volume 46, issue 4, 2008, Pages 722~726
Synthesis of Mesoporous Pt-Au Alloy Electrode by Electrodeposition Method for Direct Methanol Fuel Cell
Park, Eun-Kyung ; Ahn, Jae-Hoon ; Kim, Young-Soo ; Kim, Kyung-Hwa ; Baeck, Sung-Hyeon ;
Korean Chemical Engineering Research, volume 46, issue 4, 2008, Pages 727~731
Retention Analysis of Binary Mixture Injected into a Four-Zone Simulated Moving Bed at Steady-State
Yang, Jin-Hyo ; Kim, Jin-Il ; Koo, Yoon-Mo ;
Korean Chemical Engineering Research, volume 46, issue 4, 2008, Pages 732~738
Dynamic Optimization of a Reactive Distillation Column Producing Methyl Acetate
Kim, Ji-Yong ; Kim, Jung-Hwan ; Moon, Il ;
Korean Chemical Engineering Research, volume 46, issue 4, 2008, Pages 739~746
Effect of Additives on the Contents of Fatty Acid Methyl Esters of Biodiesel Fuel in the Transesterification of Palm oil with Supercritical Methanol
Lee, Hong-shik ; Choi, Joon-Hyuk ; Shin, Young Ho ; Lim, Young-Sub ; Han, Chong-Hun ; Kim, Hwa-Yong ; Lee, Youn-Woo ;
Korean Chemical Engineering Research, volume 46, issue 4, 2008, Pages 747~751
Microwave-mediated Asymmetric Hydrogen Transfer by SBA-15-supported Ruthenium Catalyst
Jin, Myung-Jong ; Jun, In-Chul ;
Korean Chemical Engineering Research, volume 46, issue 4, 2008, Pages 752~755
Optimization of Silver Nanoparticles Synthesis through Design-of-Experiment Method
Lim, Jae-Hong ; Kang, Kyung-Yeon ; Im, Badro ; Lee, Jae-Sung ;
Korean Chemical Engineering Research, volume 46, issue 4, 2008, Pages 756~763
Optimization of Bovine Testicular PH-20 hyaluronidase Production in Pichia pastoris
Shin, Hwa-Shook ; Kim, Eun-Ki ;
Korean Chemical Engineering Research, volume 46, issue 4, 2008, Pages 764~768
Enantioselective Epoxide Synthesis on the Chiral Salen Catalyst having a Transitional Metal Salt
Guo, Xiao-Feng ; Kawthekar, Rahul B. ; Kim, Geon-Joong ;
Korean Chemical Engineering Research, volume 46, issue 4, 2008, Pages 769~776
Synthesis of Mesoporous
Thin Films with Polypyrrole Nanoparticles by Ultrasonic-induced Polymerization
Jang, Kwang-Suk ; Cho, Sung-Ho ; Song, Myung-Geun ; Kim, Jong-Duk ;
Korean Chemical Engineering Research, volume 46, issue 4, 2008, Pages 777~782
Adsorption Dynamics of
Mixtures in Li-X Zeolite Bed
Park, Ju-Yong ; Yang, Se-Il ; Choi, Do-Young ; Jang, Seong-Cheol ; Lee, Chang-Ha ; Choi, Dae-Ki ;
Korean Chemical Engineering Research, volume 46, issue 4, 2008, Pages 783~791
The dynamic characteristics of adsorption using an adsorption bed packed with Li-X zeolite (UOP) were studied through the breakthrough experiments of H2/CH4 (90:10 vol%), H2/CO (90:10 vol%) and H2/CO2 (80:20 vol%) mixtures. Effects of feed flow rate (6.24~10.24 LPM) and adsorption pressure (6.1 bar~10.1 bar) in the Li-X zeolite bed with 2.7 cm of inside diameter and 80 cm of bed length were observed. The smaller feed rate or the higher operating pressure, resulted in the longer of the breakthrough time and the breakthrough curve have tailing due to temperature variance in the bed. The adsorption dynamics of the Li-X zeolite bed were predicted by using LDF model with feed flow and pressure dependent diffusivity. The prediction and experimental data were analyzed with a nonisothermal, nonadiabatic model, dual-site langmuir (DSL) isotherm
A Monte Carlo Simulation Approach on Supply Chain Dynamics
Ryu, Jun-Hyung ; Lee, In-Beum ;
Korean Chemical Engineering Research, volume 46, issue 4, 2008, Pages 792~798
Supply chain management (SCM) has been drawn increasing attention in industries and academia. The attention is mainly due to a need to integrate the multiple activities in a process network from the overall perspective under the constantly varying economic environment. While many researchers have been addressing various issues of SCM, there is not much research explicitly handling the overall dynamics of supply chain entities from PSE literature. In this two-part series paper, it is investigated how the overall supply chain processing times vary in response to the variation of individual entities using Monte Carlo simulation. Instead of figuring out the operation levels of individual entities, the overall operation time called TAT(Turn-Around-Time) is proposed as a performance indicator. An example of 7 entity-supply chain is presented to illustrate the proposed methodology.
Synergistic Surface Activities and Phase Behavior in Mixtures of a Diglyceryl Cationic Surfactant and a Conventional Anionic Surfactant
Choi, Jeong-Jin ; Cho, Wan-Goo ; Rang, Moon-Jeong ;
Korean Chemical Engineering Research, volume 46, issue 4, 2008, Pages 799~805
In general, anionic and cationic surfactants are incompatible because their mixtures form insoluble complexes and precipitate in the water. There are, however, some equimolar complexes of anionic and cationic surfactant that are soluble and behave like regular surfactants, specifically like nonionic surfactants, thus named pseudo-nonionic surfactant complexes. Pseudo-nonionic complexes are more effective and efficient in surface activities than their ionic surfactant components as shown by their equilibrium and dynamic surface tensions. They pack at the interface more than their ionic components. When a novel cationic surfactant, diglyceryl dodecyl dimethyl ammonium chloride(DGDAC), having the polyhydroxyl group at the hydrophilic head group, was mixed with a conventional anionic surfactant (sodium dodecyl sulfate; SDS) at equimolar ratio, we found that the aqueous equimolar mixture showed strong positive synergism in which molecular interaction parameter βM was very low, -17.2. According to the studies of equilibrium phase behavior and microscopy, this mixed system could form homogenous solutions containing vesicles.
Ammonia Conversion in the Presence of Precious Metal Catalysts
Jang, Hyun-Tae ; Park, Yoon-Kook ; Ko, Yong-Sig ;
Korean Chemical Engineering Research, volume 46, issue 4, 2008, Pages 806~812
Promoter Effect on Ni/YSZ Anode Catalyst of Solid Oxide Fuel Cell for Suppressing Coke Formation in the Methane Internal Reforming
Kim, Hye-Roung ; Choi, Ji-Eun ; Youn, Hyun-Ki ; Chung, Jong-Shik ;
Korean Chemical Engineering Research, volume 46, issue 4, 2008, Pages 813~818
Various additives were added in small amounts on Ni/YSZ anode of SOFC (solid oxide fuel cell) in order to improve reactivity and to inhibit deactivation due to coke deposition during methane reforming using a low mole ratio steam (H2O/CH4=1.5) at 800 ℃. Ni/YSZ catalysts added with various perovskites did not show any improvement but exhibited a gradual decrease in the methane conversion. K-doped Ni/YSZ showed a steady increase and maintenance of the conversion up to 42 hours, after which there was an abrupt deactivation of catalyst owing to potassium loss by volatilization. Addition of 5% of K2Ti2O5 on Ni/YSZ showed a stable maintenance of the conversion without K loss, and was able to prevent coke formation during a long time operation. Deactivation of catalyst during the reaction was mainly caused by the accumulation of graphidic carbon on the catalyst surface.
Biodegradation of JP-8 by Rhodococcus fascians Isolated from Petroleum Contaminated Soil
Nam, Bo-Hyun ; Park, Bong-Je ; Yun, Hyun-Shik ;
Korean Chemical Engineering Research, volume 46, issue 4, 2008, Pages 819~823
Microorganisms isolated from petroleum contaminated site were tested for their ability to grow on JP-8 by culturing them on the culture medium that contains JP-8 as a carbon source. The microorganism which grew on JP-8 containing minimal salt medium was separated and identified as Rhodococcus fascians. Changes in JP-8 biodegradation of R. fascians that was isolated from petroleum contaminated site was investigated with various inoculums sizes, JP-8 concentrations, medium pHs, and culture temperatures. The amount of JP-8 was analyzed by TPH using Gas Chromatography.
A Statistical-Mechanical Model for Solutions of Monodisperse Micelles
Kang, Kye-Hong ; Lim, Kyung-Hee ;
Korean Chemical Engineering Research, volume 46, issue 4, 2008, Pages 824~832
micellar solution which is comprised of surfactant monomers, monodisperse micelles, and solvent(water) is studied from a statistical-mechanical point of view. The model examined in this article is for the ideal mixture of monomers, micelles, and solvent with the dielectric constant identical to that of solvent, which is an assumption common to continuum models. The model also reflects interactions between monomer and solvent molecule, and also between micelle and solvent molecule. The statistical-mechanical model under consideration yields ln XCMC= A+BT+C/T+DlnT with XCMC being critical mcielle concentration (in mole fraction), being temperature, and A, B, C, D being constants which depend on the properties of the surfactant molecules. The statistical-mechanical model discussed in this article provides a theoretical basis on the thermal dependence of critical micelle concentration