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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 44, Issue 6 - 00 2006
Volume 44, Issue 5 - 00 2006
Volume 44, Issue 4 - 00 2006
Volume 44, Issue 3 - 00 2006
Volume 44, Issue 2 - 00 2006
Volume 44, Issue 1 - 00 2006
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Preparation of Fluorescence Particles by Spray Pyrolysis
Park, Seung-Bin ; Gang, Yun-Chan ; Jeong, Gyeong-Ryeol ;
Korean Chemical Engineering Research, volume 44, issue 3, 2006, Pages 235~242
Spray pyrosysis is a process to prepare particles and films by evaporating and decomposing droplets of precursor solutions in the order of 1-10 micrometer in diameter. Key elements of the spray pyrolysis process include precursor, solvent, droplet generator, and reactor. Various combination of these 4 elements produces wide range of particles and films. In general. the current status of the spray pyrolysis technology is not quite promising for commercial success. However, this process will be feasible to produce multicomponent functional materials of controlled morphology. In this paper, current status of the spray pyrolysis technology is introduced with the emphasis of production of fluorescence rticles.
Preparation of Oriented MFI Zeolite Membranes
Ha, Gwang ; Song, Gyeong-Geun ;
Korean Chemical Engineering Research, volume 44, issue 3, 2006, Pages 243~247
( 1 . 2 m) seed crystals were attached to the surface of the suport via chemical bonding, and the a- and b-axis orientedzeolite membranes could be synthesized on the support coated with the monolayer of the seed crystals by secondarygrowth hydrothermal synthesis. The zeolite membranes prepared were characterized using scanning electron micro-scope and analyzed by X-ray difraction.
Impregnation of Ibuprofen on MCM-41 using Supercritical Carbon Dioxide
Ju, Chang-Sik ; Cheon, Jae-Gi ; Lee, Seok-Hui ; Hong, Seong-Su ; Kim, Hong-Ryong ; Kim, Jeong-Taek ;
Korean Chemical Engineering Research, volume 44, issue 3, 2006, Pages 248~253
order to develope an efficient drug delivery system, experimental researches on the supercritical impreg-carbon dioxide was adapted as an alternative solvent as it is harmless and able to avoid defects of organic solvents indrug manufacturing processes. The procedure was composed of three steps, that is, as hydrothermal synthesis of MCM-41, supercritical impregnation of ibuprofen onto MCM-41 and release of impregnated ibuprofen. Supercritical impreg-nation reached equilibrium within 2 h for al cases of this research and the amount of equilibrium impregnationincreased with solubility of ibuprofen in supercritical carbon dioxide. Release profiles of impregnated ibuprofen showeda similar behavior for all MCM-41 with diferent impregnated ibuprofen.
Binding of Zeolites to Inorganic Fiber using Covalent Linkers
Ha, Gwang ; Kim, Hong-Su ; Song, Gyeong-Geun ; Yu, Yun-Jong ;
Korean Chemical Engineering Research, volume 44, issue 3, 2006, Pages 254~258
Zeolites with excellent adsorption capacity of volatile organic compounds were attached onto inorganic fibers which were the raw materials of honeycomb-type adsorbers. The amounts of zeolite particles attached onto the fibers considerably increased by treating them with hydrochloric acid, sulfuric acid, or hydrofluoric acid. Various functional groups such as chloropropyl, aminopropyl and epoxy groups of silane compounds, and amine groups of polyethylenimine were employed as covalent linkage materials between the fibers and zeolite particles. The state of the fibers coated with zeolite particles was examined by scanning electron microscopy, and the amounts of zeolite particles bound to the fibers were estimated from their BET surface areas. The largest amount was obtained when polyethylenimine was employed as a linkage material. Polyethylenimine was the most effective for attaching zeolite particles onto the inorganic fibers among various linkers employed.
A Comparison Study on the Separation Process of TaCl5 from the Chlorinated Reaction Product
Park, So-Jin ; Choe, Yeong-Yun ; Jo, Jeong-Ho ;
Korean Chemical Engineering Research, volume 44, issue 3, 2006, Pages 259~264
The separation and purification of TaCl5 is indispensable in the synthetic process of TaCl5 by chlorination of tantalum oxide. The reaction products are mainly TaCl5, NbCl5, TiCl4 and FeCl2. However, we need to separate TaCl5/NbCl5 mixture from the reaction product, because TaCl5 and NbCl5 are easily separated each other by distillation or hydrogen reduction process. In this work, a comparison study was carried out between direct sequence and indirect sequence to obtain TaCl5/NbCl5 mixture from the reaction product by removing light component, TiCl4 and heavy component, FeCl2 using two distillation columns. It was concluded that the direct sequence gave better results than indirect sequence in the aspect of initial capital costs and the associative operating costs.
Lessons learned in Implementing of SCM Principles On Semiconductor Manufacturing Industry: Process Systems Engineering Perspective
Yu, Jun-Hyeong ;
Korean Chemical Engineering Research, volume 44, issue 3, 2006, Pages 265~269
Considerable attention has been given to supply chains and their management in order to increase competitiveness in current ever-increasing business environments. The attention is due to the common belief that SCM contributes to reducing the redundancy between its supply chain entities and increasing profits correspondingly. However implementing SCM in actual industries involves a large number of difficulties unexpected before. In this paper, experiences in implementing SCM in a semiconductor manufacturing enterprise are discussed with some remarks on how process systems engineering can contribute to establishing SCM. It is hoped that the lessons of the specific enterprise can be of good help to others as well.
Change of the Warm Water Temperature for the Development of Smart Healthecare Bathing System
Kim, Gi-Beom ;
Korean Chemical Engineering Research, volume 44, issue 3, 2006, Pages 270~276
this study, heat loss through fre surface of water contained in bathtub due to conduction and evapora-tion has been analyzed. As a result of this study, a relational equation has been derived based on the basic theory of heattransfer to evaluate the performance of bath tubes. The derived equation was rational and quantitative. The major heatloss was found to be due to evaporation. Moreover, it has been found out that the sped of heat los depends more on thehumidity of the bathroom than the temperature of water contained in the bathtub. So, it is best to maintain the temper-ature of bathtub water to be betwen 41 to 45 °C and the humidity of bathroom to be 95. .
Determination and Calculation of Physical Properties for Sodium Glycinate as a CO2 Absorbent
Park, So-Jin ; Jang, Gyeong-Ryong ; Park, In-Hwan ;
Korean Chemical Engineering Research, volume 44, issue 3, 2006, Pages 277~283
Aqueous solution of sodium glycinate was checked as a suitable CO2 absorbent from the flu gas in the thermal power plant. For this purpose, solubility, vapor pressure, latent heat of vaporization and thermal conductivity were determined for pure and aqueous solution of sodium glycinate. The solubility of sodium glycinate in the solvent, 25 g of H2O, was increased with increasing the temperature and their relation was represented as a first order equation of y = 0.3471x + 20.993. The vapor pressure for 10 wt％ to 60 wt％ of aqueous sodium glycinate solution were determined and the latent heat of vaporization of each aqueous solution was calculated from measured vapor pressure using Clausius-Clapeyron equation. Besides, thermal conductivity of sodium glycinate powder was also determined and it was 1.0933 kcal/m·hr·oC
Photoluminescence Characteristics of (Ca, Sr)2MgSi2O7:Eu2+ Phosphor Particles Prepared by Spray Pyrolysis
Jeong, Gyeong-Yeol ; Lee, Ho-Min ; Jeong, Ha-Gyun ; Lee, Jong-Heun ;
Korean Chemical Engineering Research, volume 44, issue 3, 2006, Pages 284~288
(Ca, Sr)2-yMgSi2O7:Eu2+y (CMS) phosphor particles were prepared by using a spray pyrolysis process. The luminescent property was optimized by changing the content of Eu and the post-treatment temperature. The luminescence characteristics were also monitored with changing the ratio of Ca to Sr. The pure tetragonal Ca2MgSi2O7 or Sr2MgSi2O7 particles were obtained when the post-treatment temperature was over 1,000 oC. The highest emission intensity of CMS particles were achieved when the concentration (y) of Eu and the treatment temperature were 0.05 and 1,250 oC,respectively. The emission wavelength (λ max) of (Ca1-x, Srx)1.95MgSi2O7:Eu2+ 0.05 was gradually shifted from 524 nm to 456 nm with increasing the content of Sr due to the reduction of crystal field strength. The emission intensity and its width of Sr2MgSi2O7:Eu was greatly enhanced by substituting Ca of less than 10 mol％ for Sr without any significant peak shift. The morphology of as-prepared particles was spherical, but changed to irregular-shaped one after the post treatment at the temperature range from 900 at 1,300 oC.
Effect of RPM and Temperature on the CSD in the CMSMPR Calcium Carbonate Crystallizer
Jeong, Ok-Hui ; Han, Hyeon-Gak ; Im, Mi-Hui ;
Korean Chemical Engineering Research, volume 44, issue 3, 2006, Pages 289~293
In the CMSMPR (continuous mixed suspension mixed product removal)system, the effect of temperature and RPM on the CSD (crystal size distribution) in the calcium carbonate process was investigated. In the steady state operation, the change of solution pH was small. At the low temperature and below 300 RPM, volume mean size change of calcium carbonate was stable and CSD was narrow. In the SEM view, calcite and aragonite was obtained.4y
Computational Analysis of Flow Velocity and Particle Trajectory on the Surface of Bag-Shaped Filters with a Different Permeability
Park, Seok-Ju ; Lee, Dong-Geun ; Lee, Si-Hun ;
Korean Chemical Engineering Research, volume 44, issue 3, 2006, Pages 294~299
Computational simulation was performed to analyze flow velocities and particle trajectories onto the surface of bag-shaped filters with a different permeability. When the permeability of a filter is lower than that of a low-efficient fabric bag-filter widely used, the distributions of flow velocities and particle trajectories on the filter surface were not different with decreasing the filter permeability. The distributions of streamlines and radial directional gas velocities were uniform on the filter surface except for the neighbors of the bottom edge and outlet of the filter. The particle trajectories onto filter surface were more densely distributed around the bottom edge of the filter, so that the particle number on the filter surface was maximized near the bottom edge and decreased in the direction of the filter outlet.
Photocatalytic Activities of Titania Deposited Beads by FB-CVD as Operation Variables
Park, Jae-Hyeon ; Im, Nam-Yun ; Park, Hae-Ung ; Lee, Seung-Yong ; Gwak, Ji-Ni ;
Korean Chemical Engineering Research, volume 44, issue 3, 2006, Pages 300~306
Photocatalyst deposited beads were prepared by fluidized bed chemical vapor deposition (FB-CVD) under various operating conditions of substrates, bed temperature, pressure, and oxygen concentration. Photocatalytic degradation of acetaldehyde was carried out to determine the optimum operating condition of prepared photocatalysts. They were characterized by using FE-SEM, XRD, and XPS. From the FE-SEM photographs, it was found that the surfaces of titania-coated beads were covered with crystal form, particle form, and slick form of titania on alumina, silica-gel, and glass beads, respectively. From the result of photocatalytic degradation of acetaldehyde, it was found that prepared titania/ alumina beads at 600 oC, 5 torr showed superior performance to others, and oxygen flow rate has no significant effect
Development of a Catalyst/Sorbent for Methane-Steam Reforming
Jeong, Su-Hyeon ; Na, Jeong-Geol ; Kim, Seong-Su ; Kim, Jin-Geol ; Jo, Yong-Hun ;
Korean Chemical Engineering Research, volume 44, issue 3, 2006, Pages 307~313
In order to improve the efficiency of methane steam reforming process, a part of the system which produces hydrogen from heavy hydrocarbon resources such as coal, we combined metal catalyst with CaO sorbent and fabricated catalyst/sorbent. To increase the porosity and the compressive strength of sorbent, carbon black and α-alumina were mixed with CaO powder during preparation. The effects of sorbent composition on the physical properties were investigated by SEM, TGA, BET, XRD, abrasion strength measuring device and adsorption-desorption instrument. Sorbent with 5 wt％ Al2O3 and 10 wt％ carbon black showed the best physical features with 7.61 kgf strength and 47％ CO2 adsorption capability. Various metal catalysts such as Ni, Co and Fe were supported on the sorbent developed and 10 wt％ Ni/sorbent was selected for methane steam reforming process based on the result of reaction experiment. The reaction system using the catalyst/sorbent showed better H2 productivity compared to the detached system with catalyst and sorbent, indicating the effectiveness of the system developed in this study.
Characterization of Alternative Anode Catalysts for Direct Formic Acid Fuel Cell
Lee, Yeong-U ; Lee, Hyo-Song ; ; O, In-Hwan ; Kim, Gi-Ho ; Yu, Jae-Geun ; Kim, Yeong-Cheon ;
Korean Chemical Engineering Research, volume 44, issue 3, 2006, Pages 314~318
Direct formic acid fuel cells (DFAFCs) are potential alternative power sources for portable devices such as cellular phone, personal digital assistants (PDA) and laptop computers. In this study, we developed the catalysts for great performance of fuel cell, and investigated their characteristics by using EDS and SEM. Pt-Pd catalysts showed uniform size and homogeneous distribution. As the content of palladium increased, the performance of DFAFC increased. Pd black showed the greatest performance among the five catalysts tested. Also, Pt-Pd (1:1) catalyst had an excellent maximum power density of 120 mW/cm2. As the operating temperature increased, fuel cell performance was increased due to a reaction activity increases of catalyst. But, temperature had only a slight effect on the performance of fuel cell in the best activity range of membrane.
Life Cycle Assessment of Ethanol Production Process Based on Fermentation
Jeong, Yeon-Su ; Kim, In-Won ; Mun, Il ; Yeo, Yeong-Gu ; Hwang, Il-Hun ;
Korean Chemical Engineering Research, volume 44, issue 3, 2006, Pages 319~322
In this paper, the methodology of life-cycle assessment was applied to an ethanol production process based on fermentation. The purpose of the assessment was to quantify environmental performance of the process and to prepare a basis for environmental comparisons with the ethanol production process based on catalytic reaction. The assessment was carried only on the stages of raw material acquisition through ethanol manufacture since it was assumed that ethanol from both processes had the same environmental impacts through its use and discard. The assessment results showed that the major environmental impact came from the sub-process of producing starch from corn and the most severe burden was generated in the form of acidification and greenhouse effect.
Life Cycle Assessment of Ethanol Production Process Based on Catalytic Reaction
Jeong, Yeon-Su ; Yeo, Yeong-Gu ; Ju, O-Sim ; Jeong, Gwang-Deok ; Hwang, Il-Hun ;
Korean Chemical Engineering Research, volume 44, issue 3, 2006, Pages 323~327
In this paper, the methodology of life-cycle assessment was applied to an ethanol production process based on catalytic reaction. The environmental performance of the process was quantified and compared with that of the fermentation process. The purpose of the assessment was to develop design guidelines for the environmentally better ethanol production. The assessment was carried only on the stages of raw material acquisition through ethanol manufacture since it was assumed that ethanol from two processes had the same environmental impacts through its use and discard. The inventory analysis of the catalytic process resulted in that carbon dioxide from methanol production was the major environmental impact. The impact assessment showed that the fermentation process was environmentally better than the catalytic one. Suggestions for environmental improvement of the catalytic process were prepared based on the assessment results.