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REFERENCE LINKING PLATFORM OF KOREA S&T JOURNALS
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Korean Chemical Engineering Research
Journal Basic Information
Journal DOI :
The Korean Institute of Chemical Engineers
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Volume & Issues
Volume 42, Issue 6 - Dec 2004
Volume 42, Issue 5 - Oct 2004
Volume 42, Issue 4 - Aug 2004
Volume 42, Issue 3 - Jun 2004
Volume 42, Issue 2 - Apr 2004
Volume 42, Issue 1 - Feb 2004
Selecting the target year
Manufacture and Separation Characteristic of MIP
Row, Kyung-Ho ; Kim, Yinzhe ;
Korean Chemical Engineering Research, volume 42, issue 6, 2004, Pages 635~645
The molecular imprinting technique is a reliable technique for the preparation of materials of predetermined selectivity. It is highly significant in research of the structure of enzyme, mechanism of receptor-antibody and analytical chemistry. In analytical separation science, molecularly imprinted polymers have been applied in several analytical techniques, such as liquid chromatography, capillary electrochromatography and capillary electrophoresis, solid phase extraction, immuno-assay, and as a selective in chemical sensors. Molecular imprinted polymer for chiral separations have been prepared mainly two approaches: covalent and non-covalent binding of the template and the functional monomer. In this review article, the essential theories, synthesis, manufacture and separation characteristic of molecular imprinting technique are widely described.
A Mathematical Modeling for Prediction of Phenomena in Rotary Kiln with Various Operating Conditions
Lim, Jung-Hoon ; Yi, Sung-Chul ; Kim, Yoo-Taek ;
Korean Chemical Engineering Research, volume 42, issue 6, 2004, Pages 646~653
Rotary kilns are employed by industrial site to carry out a wide variety of material processings; calcining limestone, reduction of oxide ore,etc. In this study a mathematical model was developed to predict heat transfer from the freeboard gas to the bed of a rotary kiln. This presents a three-dimensional mathematical model to describe and simulate the calcination of solid bed in a rotary kiln. The model comprises conventional differential equations derived from the principles of conservation of mass and energy and this can be used to predict the temperature profiles of the solid bed, the gas phase and inner wall of the kiln along the length of the kiln axis and in radial direction. The major parameters considered here are kiln rotation rate(rpm), filling ratio of the solid bed, burner injection-temperature. The results from the simulation showed reasonable agreement with experimental results available in the literature.
A Mathematical Model for Direct Calculation of Water Content Distribution in Membrane Electrode Assembly
Lee, Chi-Seung ; Yi, Sung-Chul ;
Korean Chemical Engineering Research, volume 42, issue 6, 2004, Pages 654~661
Water content is one of the critical factors in predicting physical and electrochemical phenomena in Membrane Electrode Assembly(MEA), which is a core element of polymer electrolyte fuel cell(PEFC). Water content directly affects on proton conductivity in MEA and is also a very important parameter in predicting current density distribution. To paraphrase, water content is a critical factor in predicting the performance of PEFC. Therefore, accurate prediction of water content distribution in MEA is important in PEFC modeling. In this paper, in order to directly calculate the water content distribution in MEA, we introduced a mathematical model, which is based on computational fluid dynamics, using internal boundary conditions and validated it by comparing with experimental data.
Demulsification of Oil-Water Emulsions by Microwave Irradiation
Hong, Joo-Hee ; Kim, Byoung-Sik ; Kim, Dok-Chan ;
Korean Chemical Engineering Research, volume 42, issue 6, 2004, Pages 662~668
The studies of oil recovery, size of dispersed droplets and temperature profile during microwave demulsification were carried out. Microwave demulsification has no secondary pollution problems, because no chemical additives are required. Also, because microwave selectively heats emulsion, faster separation rate and less energy consumption than conventional heating are possible. As the 20, 30, and 50%(v/v)O/W emulsions were continuously irradiated by microwave for 120 seconds, percentages of oil recovery after 1hr settlement were 75, 84, and 95% respectively. Also, the rates of temperature rise were 0.478, 0.505, and 0.602(
/s) respectively. Likewise, because the viscosity of emulsion was decreased with temperature rise, the diameter of dispersed oil droplet was increased and the coalescence of it was accelerated. Therefore, demulsification was quickly accomplished.
Extraction of Isoflavones from Korean Soybean by Sub/Supercritical Water
Han, Soon-Koo ; Lee, Kwang-Jin ; Kim, Jae-Duck ; Lee, Youn-Woo ; Row, Kyung-Ho ;
Korean Chemical Engineering Research, volume 42, issue 6, 2004, Pages 669~672
Aglycones compounds were extracted from Korean soybean by sub/supercritical water. The various experimental variables were the temperature and pressure of sub/supercritical water. The extracted sample was analyzed by reversed-phase high performance liquid chromatography (RP-HPLC). Aglycons were selectively extracted at the experimental condition of
and 200 bar of subcritical water. It was also experimentally observed that almost the same amount of aglycones,
, was extracted from 5 g of Korean soybean at
and 250 bar of supercritical water.
An Equation of State for Associating Fluids and Vapour-Liquid Equilibria of Associating Mixtures
Kim, Mi-Kyung ; Kim, Ki-Chang ;
Korean Chemical Engineering Research, volume 42, issue 6, 2004, Pages 673~683
The equation of state which combines Peng-Robinson EoS and the association term of SAFT model was presented for describing thermodynamic properties and phase behaviors of associating fluids. The resulting EoS(Peng-Robinson-Plus-Association) is not cubic with respect to volume and contains five pure compound parameters. 5-parameters of pure chemical compounds were estimated with correlations of both saturated vapour pressures and liquid volumes for alcohols, primary amines, carboxyl acids and water. A method to reduce the number of adjustable pure compound parameters from five to three was considered, and then the 3-parameters EoS model was obtained. This 3-parameter model maintained the good correlations of saturated vapour pressures and liquid volumes. Additionally the equation of state proposed in this work was applied to calculations of vapour-liquid equilibria for the binary mixtures containing associating chemicals, the result showed a good agreement with experimental data for all binary mixtures except for the ethanol/water system, examined in this work.
Sorption and Permeation Characteristics of
in Polystyrene Membrane Treated with
Yang, Young-Soo ; Kwak, Hyun ; Kumazawa, Hidehiro ; Bae, Seong-Youl ;
Korean Chemical Engineering Research, volume 42, issue 6, 2004, Pages 684~689
The applicable possibility of dual-mode sorption/mobility model and the change of mean permeation coefficient as the change of the plasma input power were investigated from the sorption and permeation experiments of
in polystyrene membrane treated with
plasma. The sorption experiment carried out using a pressure decay method and the permeation experiment carried out using a variable-volume method. The sorption and permeation behavior of
were simulated well in terms of the dual-mode sorption and mobility model. The mean permeation coefficient was decreased under 80 W of the plasma input power but increased above 80 W of the plasma input power.
Effects of APS(aminopropyltriethoxysilane) Addition on the Properties of Hydrophilic Coating Films
Lee, Dong-Il ; Park, Ja-Lyong ; Park, Kwon-Pil ; Jang, Sang-Hong ; Song, Ki-Chang ;
Korean Chemical Engineering Research, volume 42, issue 6, 2004, Pages 690~695
Inorganic-organic hybrid coating solutions with a good hydrophilic property on polymeric films were synthesized by the sol-gel method. The coating solutions were prepared by adding 3-aminopropyltriethoxysilane (APS) to a colloidal silica solution (Ludox). The coating thickness on PET sheet, dip-coated with the hybrid solutions, increased with increasing the APS content of the coating solutions. And the effect of synthesis parameters of the coating solutions was investigated on the property of the dried powders, which were prepared by drying the coating solutions at
. The average pore diameter of the dried powders, as determined by nitrogen adsorption, increased with increasing the APS content of the coating solutions, while it was not dependent on the pH condition of the coating solutions.
Evaluation of Coal Viscosity in Thermoplastic State
Kim, Min-Ju ; Oh, Myong-Sook ;
Korean Chemical Engineering Research, volume 42, issue 6, 2004, Pages 696~705
The plasticity of coking coal is an important property influencing the strength of metallurgical coke. A molten coal viscometer with well defined flow field under a constant shear rate was designed, and the experimental procedures for reliable viscosity measurements were developed. The viscometer consists of a Searle-type concentric cylindrical cell, the rotor with the shortest possible length, a small split furnace of uniform internal temperature, and the hood for continuous vent of volatiles. The cell dimensions were determined to use the minimum possible amount of coal, while minimizing the end effect. A packing device for uniform packing of coal particles was also developed. The viscosities of 11 molten coals were determined. The trend in the minimum viscosity was in agreements with the trend in the maximum fluidity measured by Gieseler plastometer, but the viscometer showed narrower measurement range than the plastometer. The viscometer also gave the correct trends with the particle size and the packing density: the increase in coal particle size and packing density increased the plastic period and decreased the minimum viscosity.
Preparation and Release Behaviors of Porous Poly(butylene succinate)/Poly
Microcapsules Containing Fragrant Oil
Park, Soo-Jin ; Kim, Ki-Seok ; Hong, Sung-Kwon ;
Korean Chemical Engineering Research, volume 42, issue 6, 2004, Pages 706~711
The biodegradable poly(butylene succinate) (PBS)/poly($\epsilon$ and
meaning the melting points of PCL and PBS, respectively. This proved that PBS and PCL were mixed so that PBS/PCL microcapsules were composed of two wall-forming materials. The release behaviors were decreased with increasing the PCL content. It was noted that the coated PCL on the PBS microcapsule retarded the release rate of fragrant oil from microcapsules.
Dry Etching of
Hard Mask in
Inductively Coupled Plasmas and Comparison with Design of Experiments
Park, Hyung-Jo ; Ra, Hyun-Wook ; Nahm, Kee-Suk ; Kim, Ki-Ju ; Hahn, Yoon-Bong ;
Korean Chemical Engineering Research, volume 42, issue 6, 2004, Pages 712~715
Hard mask was widely used as etch mask due to the thermal instability of photo-resist in the etch process. The patterning process of hard mask must be guaranteed before everything else in order to accomplish the fine pattern transfer. The
film as the hard mask was etched in the
inductively coupled plasmas. Etch characteristics of the
film as a function of the processing parameters were investigated. The best etch characteristics without deformation of photo-resist were obtained at 600 W ICP source power and 75 W RF chuck power, and the etch rate was 590 nm/min. The optimum etch conditions of the
film by response surface method were 600 W ICP source power, 75 W RF chuck power, 55%
concentration, and 20 mTorr operating pressure. Etch rate was 564 nm/min at the optimum etch conditions and was in good agreement within 4% error compared with the etch rate obtained by the experiment.
Gasification from Surface during Discharge and Thermal Process in Plasma Display Panel (PDP)
Soh, Hyun ; Lee, Sang-Moo ; Moon, Sei-Ki ; Kim, Young-Chai ;
Korean Chemical Engineering Research, volume 42, issue 6, 2004, Pages 716~721
Plasma display panel(PDP) uses the mixture of inert gases to generate a discharge inside display pixels. Inside of PDP, there exists highly reactive conditions in the gap between two glass panels. Chemical properties of MgO layer and phosphor have been investigated as a function of discharge and thermal process. Impurities such as CO,
, OH and
in discharge region may deteriorate the characteristics of PDP operation during life time. Change of impurity generation of various MgO and phosphor surfaces were measured by using x-ray photoelectron spectroscopy (XPS) and quadropole mass spectrometer (QMS). Concentrations of carbon containing species such as C, CO and
were drastically increased from surfaces during discharge and thermal treatment. Carbon impurities on the MgO and phosphor are the dominant factor for their instability.
Miniature Plastic-Based Proton Exchange Membrane Fuel Cells
Lee, Jung-Hun ; Kim, Tae-Hee ; Lee, Byung-Ho ; Yang, Hoe-Taek ; Cho, Gyou-Jin ; Park, Kwon-Pil ;
Korean Chemical Engineering Research, volume 42, issue 6, 2004, Pages 722~726
The fabrication and performance evaluation of new miniature PEMFC based on plastic(polyimide) substrate are presented in this paper. Polyimide substrate provide a current collector and flow channel. The electronic conduction on the nonconductive polymer was enabled by sputtering of gold on the top of the polyimide. Strong adhesion and high conduction in binding of elements are obtained by using the method which attached adhesive and conductive component separately between elements instead of using mixture of these components. Hydrogen is provided by the hydrolysis of sodium borohydride (
). Operating on air at
and atmospheric pressure, the measured peak power density was
for the miniature banded two cell using a Nafion 117 and E-TEK electrodes.
Synthesis of Silver Nanowires by Chemical Reduction Method with Seeds and Water-Soluble Polymers
Kim, Soo-Kon ; Moon, Sei-Ki ; Oh, Seong-Geun ;
Korean Chemical Engineering Research, volume 42, issue 6, 2004, Pages 727~734
Silver (Ag) nanowires with five-twinned structure were synthesized by chemical reduction method through the polyol process, in the presence of capping agents. The obtained silver nanowires are well-high monodispersed with the average diameter of 80 nm and length of
. Micro-scopical structures in these nanowires could be varied from nanoparticles and nanorods to nanowires by controlling the reaction conditions such as reaction temperature, molecular weight of PVP, kinds of seed materials, and changes of liquid polyols. Nanoparticles of platinum groups play roles of seed materials for the heterogeneous nucleation and growth of silver because of their close fitness in crystal structure and lattice constant. Scanning electron microscopy (SEM), transmission electron microscopy (TEM), x-ray diffraction (XRD) and UV-visible spectroscopy were used to characterize silver nanowires.
Kinetic Studies on the Synthesis of Polyurethane Prepolymer with Isophorone Diisocyanate(IPDI) and Dimethylol Alkanoic Acids by Real-Time In-situ IR Spectroscopy
Cho, Hang-Kyu ; Kim, Hyung-Zip ; Seo, Gyo-Taeg ; Kang, Shin-Choon ;
Korean Chemical Engineering Research, volume 42, issue 6, 2004, Pages 735~740
Kinetics of pre-polymerization of polyurethane formation between isophorone diisocyanate (IPDI) and dimethylol propionic acid (DMPA) in solution state (IP reaction), and IPDI and dimethylol butanoic acid (DMBA) in solution state (IB reaction) were studied by using quantitative real-time in-situ IR spectroscopy at different temperatures in the range of
with [NCO]/[OH] ratio of 1.0. The reaction rate was obtained from monitoring the change of NCO (
) stretching band in series IR spectra. The reaction was in accord with the first-order for the concentrations of hydroxyl groups and isocyanate groups respectively, which conformed to the second order law entirely. The activation parameters were obtained from the evaluation of kinetic data as follows. For IP reaction, activation energy (
)=42.2 kJ/mol, activation enthalpy (
)=39.3 kJ/mol and activation entropy (
)=-146.7 J/mol K. For IB reaction,
=34.0 kJ/mol and
=-163.3 J/mol K.
Perfluoropolyether Addition Effect on the Properties of Poly(Ethylene Oxide)-Based Solid Polymer Electrolytes
Kweon, Jung-Ohk ; You, Jong-Sung ; Noh, Si-Tae ;
Korean Chemical Engineering Research, volume 42, issue 6, 2004, Pages 741~747
We studied perfluoropolyether addition effect on the properties of poly(ethylene oxide)-based solid polymer electrolytes (SPE). PFPE/PEO PU prepared with 1/99, 5/95, 10/90, and 20/80 of PFPE/PEO wt. ratio. PFPE/PEO
was prepared from lithium trifluoromethane sulfonate (
). The glass transition temperatures (
) and melting temperatures (
) of PEO phases from differential scanning calorimetric analysis (DSC) were similar in salt-free PFPE/PEO PU series regardless of PFPE/PEO wt. ratio. In a series of PFPE/PEO
of PEO phase slightly increased with increasing PFPE contents. In both series of PFPE/PEO PU and PFPE/PEO
, the surface energies calculated by contact angle decreased with the increase of PFPE contents due to PFPE phase localized on the surface. Thermal stability from thermogravimetric analysis (TGA) was slightly decreased with increasing PFPE contents in both PFPE/PEO PU and PFPE/PEO
. Ionic conductivity of PFPE/PEO
was slightly increased with the increase of PFPE contents.
Applications of Porous Activated Carbon-Silica Gel Composite Electrodes for Capacitive Deionization Process
Yang, Chun-Mo ; Choi, Woon-Hyuk ; Cho, Byung-Won ; Cho, Won-Il ; Yun, Kyung-Suk ; Han, Hak-Soo ;
Korean Chemical Engineering Research, volume 42, issue 6, 2004, Pages 748~753
Capacitive deionization(CDI) process kinds of electrochemical adsorption method was employed in order to solve the water deficient problems. In our study, porous activated carbon-silica gel composite electrodes with high wet-ability and mechanical strengths are invented by paste rolling method in our laboratory and investigated electrochemical characteristics such as current changed values as a function of time, coulombs, specific coulombs and chargedischarge efficiencies as a function of cycles until 10th and 100th cycles in 1,000 ppm NaCl solution. Porous activated carbon-silica gel composite electrodes showed efficient CDI performances with decreasing active material usages and increasing wet-ability, mechanical strengths in NaCl solutions. In our electrochemical runs, all of the activated carbonsilica gel composite electrodes also showed good cyclic-ability without destroy of active materials during cycles. The electrode-manufacturing times decreased by 50%. Average specific charge-coulombs by 100th cycles are also appeared very higher 0.456(C composite electrode) than 0.317 (A min.)/g(A electrode). The charge-discharge efficiencies by 100th cycles are showed good cycle-ability and appeared over 73% and 75.6% in case of A electrode and C composite electrode. However, at the 100th cycles, 76% of charge-discharge efficiencies is showed in C composite electrode but 66% of charge-discharge efficiencies is showed in A electrode.
Desulfurization Characteristics of Low Sulfur Coals before Combustion using
Nam, Young-Woo ; Park, Kye-Sung ;
Korean Chemical Engineering Research, volume 42, issue 6, 2004, Pages 754~761
This research aimed to elucidate desulfurization characteristics of low sulfur coals (two imported bituminous coals and two domestic anthracite coals) before combustion and to optimize desulfurization conditions in a leaching process using hydrogen peroxide. The optimum condition for the leaching process was obtained when the experiments were carried out for 60 minutes at
. The sulfur removal efficiency for the anthracite and bituminous coals were 55-80% and 58-67%, respectively. The effect of particle size on desulfurization efficiencies was negligible within experimental error. Heating values of treated bituminous coals slightly decreased, while those for anthracite coals slightly increased. The ash removal efficiency for bituminous and anthracite coals were 11-22% and 9-26%, respectively. It is thought that some of chars processed by leaching process would meet the current
emission standard without flue gas desulfurization process.
Effect of pH, Anions, Cations, DO, UV and Organics on the Photocatalytic Reaction in
Kim, Kwang-Wook ; Kim, Young-Jun ; Lee, Mi-Hye ; Shin, Dong-Woo ;
Korean Chemical Engineering Research, volume 42, issue 6, 2004, Pages 762~770
With respect to the photocatalytic
powder dispersed in the water, the relationship between the experimental conditions influencing photocatalytic activities and the degree of decomposition were examined for the various sources of photocatalytic powder. For the relationship between pH and level of organic decomposition, a high degree of decomposition was shown in the range of pH 5 to 7, whereas the activity was significantly reduced out of the range. The cations and anions contained in the slurry also affected the decomposition depending on their concentrations and the sources of photocatalytic
powder. Dissolved oxygen enhanced the degree of decomposition. This might be due to the effect of oxygen acting as an electron scavenger. The destruction yields of 4CP with the photocatalytic
powders were affected by the wavelength of irradiated UV light on the
powder. One particular source of
powder has not always shown superior activities irrespective of kinds of target organics and experimental conditions. These showed that the degree of organic decomposition by the photocatalytic
powders dispersed in the water varied significantly, depending on the environmental conditions the photocatalyst was surrounded.
Performance Test of the Tritium Storage Vessel
Paek, Seung-Woo ; Ahn, Do-Hee ; Kim, Kwang-Rag ; Yim, Sung-Paal ; Lee, Min-Su ; Chung, Hong-Suk ;
Korean Chemical Engineering Research, volume 42, issue 6, 2004, Pages 771~775
A WTRF(wolsong tritium removal facility) is under construction at the Wolsong Nuclear Generating Station to recover the tritium from the heavy water. This facility is expected to produce a high purity tritium, greater than 99.0% isotopically pure. The recovered tritium must be packaged safely for long-term storage. Packaging tritium as a solid metal tritide is preferred over gaseous tritium due to the concern for the leakage. Titanium sponge has been selected as suitable material for tritium product immobilization. In this study, prototype tritium storage vessel has been designed and fabricated for the WTRF. The vessel contains 850 g of titanium sponge in
volume. The hydrogen gas (equivalent to 50 kCi of tritium) is reacted with titanium sponge in a batch. The final hydrogen content (H/Ti) of the titanium sponge was 1.0 after ten batch reactions and this amount of hydrogen is equivalent to 500 kCi of tritium. Therefore, it was shown that the prototype tritium storage vessel can be used sufficiently for the WTRF.