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REFERENCE LINKING PLATFORM OF KOREA S&T JOURNALS
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Applied Chemistry for Engineering
Journal Basic Information
Journal DOI :
The Korean Society of Industrial and Engineering Chemistry
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Volume & Issues
Volume 18, Issue 6 - Dec 2007
Volume 18, Issue 5 - Oct 2007
Volume 18, Issue 4 - Aug 2007
Volume 18, Issue 3 - Jun 2007
Volume 18, Issue 2 - Apr 2007
Volume 18, Issue 1 - Feb 2007
Selecting the target year
The Trends of Recent Development in Papermaking Additives
Ryu, Jeong-Yong ; Kim, Hyoung-Jin ; Jo, Byoung-Muk ;
Applied Chemistry for Engineering, volume 18, issue 6, 2007, Pages 531~536
The review is to introduce newly developed papermaking additives that has been applied to obtain a optimized papermaking production processes through paper quality and productivity improvements in recent years and near future. Not only the introduction of newly developed papermaking additives, but also the discussion on their application principles, methods, controls, inspections, and future development direction has been presented in the paper. The development of papermaking technology has focused on papermaking productivity, paper quality, and production effectiveness improvement through the optimization of the already developed technologies. It is thus concluded that even if noticeable innovative changes has not been in an area of papermaking additives, the development of several important papermaking additives in a technical aspect has been reported and improved the control and management of the papermaking system based on the development.
A Study on Removal Effect of Residual Pesticide on Adsorbent
An, Jung-Hyeok ; Kim, Joon-Bum ; Kwon, Young-Du ; Jeon, Choong ; Park, Kwang-Ha ;
Applied Chemistry for Engineering, volume 18, issue 6, 2007, Pages 537~544
This study was carried out to investigate adsorption characteristics of residual pesticides on an adsorbent. Bauxsol TM and mackban-stone as adsorbent were used. Analytical method for residual pesticides was established by GC/NPD and GC/μECD. Pesticides used in this study were α-endosulfan, β-endosulfan, pendimethalin and chlorpyrifos-methyl, fenitrothion, and recovery rates were more than 97%. Adsorption rate on an adsorbent was decreased in order of endosulfan, chlorpyrifos-methyl, pendimethalin, fenitrothion. Organochlorine pesticides showed higher removal rate than the other pesticides. Bauxsol TM gave both chemical decomposition and physical adsorption. Mackban-stone gave only physical adsorption on the other hand. The high pH and chloric ions structure of eluted solution have greatly affected at chemical resolution. The removal rate of pesticides was increased due to the physical property of adsorbent, i.e. high porosity. The above adsorbent is to be a candidate to remove residual pesticides in water and pond of links.
Synthesis of Pure Brookite-type
Nanoparticles from Aqueous
Solution with controlled Acidity by Precipitation Method
Lee, Jeong-Hoon ; Yang, Yeong-Seok ;
Applied Chemistry for Engineering, volume 18, issue 6, 2007, Pages 545~551
HCl concentration, reaction temperature, and Ti4+ concentration are the decisive factors in determining the structure of precipitates in the process of synthesis of TiO2 particles from aqueous TiCl4 solution by precipitation and the volumetric proportion of brookite phase in TiO2 particles can be controlled by these factors. Pure brookite-type TiO2 nanoparticles were synthesized by heating the aqueous TiCl4 solution with no more than 1.0 M of Ti4+, in which the concentration of HCl was kept in the range of about 2.53∼6.41 M during reaction, at the temperature below 70 ℃ for 20 h. Also, Pure brookite was finally transformed to a rutile phase via an anatase phase through heat-treatment.
A Effect of
Pretreatment on VOCs Oxidation over Noble Catalysts on Titania
Kim, Moon-Chan ; Ko, Sun-Hwan ;
Applied Chemistry for Engineering, volume 18, issue 6, 2007, Pages 552~556
In this study, noble metals (Pd, Ru, Ir) were supported to TiO2 catalyst. In order to distribute metals uniformly, H2O-H2 pretreatment technique was used. Xylene, toluene, and MEK were used as reactants. The monometallic or bimetallic catalysts were prepared by the excess wetness impregnation method and were characterized by XRD, and XPS analysis. Pd-Ru, Pd-Ir bimetallic catalysts had multipoint active sites which improved the range of Pd metal state. Bimetallic catalysts had a higher conversion of VOCs than that of monometallic one. The effect of H2O-H2 pretreatment technique was the enhancement of uniform distribution of Pd particles and promotion of catalytic efficiency. In this study, addition of Ru and Ir metals to Pd promoted oxidation conversion of VOCs. In addition, H2O-H2 pretreatment promoted removal efficiency of VOCs on the TiO2 support.
Studies on the Thermal and Rheological Properties of Polypropylene/ Starch-MB Blends
Kim, Youn-Cheol ; Lee, Chang-Young ;
Applied Chemistry for Engineering, volume 18, issue 6, 2007, Pages 557~561
Polypropylene (PP)/corn starch master batch (starch-MB) blends with different PP compositions of 40, 50, 60, and 80 wt% were prepared by melt compounding at 200 ℃, using lab scale Brabender mixer. The chemical structures and thermal properties of the PP/starch-MB blends were investigated by FT-IR, differential scanning calorimetry (DSC), and thermogravimetric analyzer (TGA). The chemical structure was confirmed by the existence of hydroxy group. There was no district change in melting temperature and melting enthalpy, and TGA curve indicated a decrease in degradation temperature with starch-MB content. The porosity change of blend was measured by scanning electron microscope (SEM), the degree of porosity on the blend surface increased with the starch-MB content. The rheological properties indicated an increase in complex viscosity, shear thinning tendency and elasticity with the starch-MB concentration. These effects were confirmed by an oscillatory viscometer at 200 ℃. From these results, it is found that 40 wt% is the optimum starch-MB concentration. The fiber was fabricated from PP60/MB40 with 40 wt% starch-MB and the porosity and tensile properties were investigated.
Asymmetric Ring Opening Reaction of Racemic Epoxides by Polymeric Chiral Salen Catalyst containing Metal Salts
Lee, Kwang-Yeon ; B.Kawthekar, Rahul ; Kim, Geon-Joong ;
Applied Chemistry for Engineering, volume 18, issue 6, 2007, Pages 562~567
The stereoselective synthesis of chiral terminal epoxide is of immense academic and industrial interest due to their use as versatile starting materials as well as chiral intermediates. In this study, new polymeric chiral Co(salen) complexes bearing tallium (III)chloride and iron (III)chloride (ferric chloride) have been synthesized and characterized. Their catalytic activity and selectivity have been demonstrated for the asymmetric ring opening of various terminal epoxides using water and phenol derivatives as nucleophiles. The easily prepared polymeric complexes exhibited very high enantioselectivity for the asymmetric ring opening of epoxides with H2O and phenol nucleophiles, providing enantiomerically enriched terminal epoxides (> 98% ee). The system described in this work is very efficient for the synthesis of chiral epoxide, 1,2-diol and α-aryloxy alcohol intermediates.
Low Temperature Preparation of Transparent Glass-Ceramic Using Metal-Alkoxides (1) Synthesis and Properties of Porous Monolithic Gel in
Chun, Kyung-Soo ; Tak, Joong-Jae ;
Applied Chemistry for Engineering, volume 18, issue 6, 2007, Pages 568~574
Crack-free dried gel monoliths of the composition Li2O1.7Al2O38.6SiO2 have been prepared as a precursor of transparent glass-ceramic by the hydrolysis and polycondensation of mixed metal alkoxides in solutions containing N,N-dimethylformamide as the drying control chemical additive, alcohols, and water. It was investigated that activation energy for gelation according to the variation of water concentration ranged from 13 to 14 kcal/mol. Only when the amount of water for gelation was 3 times higher than the stoichiometric amount, monolithic dry gels were successfully prepared after drying at 70∼75 ℃ and at a rate of 0.1∼0.3%/h. The specific surface area, the pore volume, the average pore diameters of dried gel at 180 ℃ were about 239.40 m2/g, 0.001∼0.03 mL/g, and 145.62 Å, respectively. It showed that the dried monolithic gel had a porous body. The DTA curve had the first exothermic peak around 800 ℃ and the 2nd peak around 980 ℃, which may correspond to crystallization of the gel.
Study on the Design of Attached Revolution Body Horizontal Rotary Kiln Dryer and the Optimum Operational Conditions
Jung, Dong-Hyun ; Chun, Young-Nam ;
Applied Chemistry for Engineering, volume 18, issue 6, 2007, Pages 575~579
Sludge disposal technology has been studied with many researchers since disposal of sewage sludge has been a social problem. The current technologies include incineration, carbonization, pyrolysis, landfilling and fertilization. However, all of these processes require a dry process, because sewage sludge with more than 80% high water content is difficult to be used as a raw material. This study has the purpose to establish the optimal operation conditions and the technology as changing the variables: kiln residence time, sludge load, dryer temperature, by using the previous study that is rotary kiln type dryer designed as a numerical simulation study. As the results, optimum conditions are determined as follows: kiln residence time, sludge load, dryer temperature are 62.5 kg/m3.hr, 26.2 min, 330 ℃, respectively. Content of water, drying efficiency, weight loss, volume loss show that the results are 10 ± 2, 88, 80, 60%, and the dried sludge is released by a dryer below 10 mm.
Thermophysical Properties of 4D Carbon/Carbon Composites with Preform Architectures
Kim, Zeong-Baek ; Lee, Ki-Woong ; Park, Jong-Min ; Joo, Hyeok-Jong ;
Applied Chemistry for Engineering, volume 18, issue 6, 2007, Pages 580~586
In this study, 4 directional carbon/carbon composites with different preform architectures were manufactured and their thermophysical properties are studied. Carbon fiber preforms are fabricated with fiber bundles using four different spaces. The density of the fabricated preforms were increased through pressure impregnation and carbonizing process. The increased density of the composites was graphitized at 2300 ℃. Microstructures of these composite were observed under scanning electron microscope. This was to understand the effect the preform architectures has on the thermophysical properties of carbon/carbon composites. Also, the behavior of thermal conduction and heat expansion was investigated and studied in association with the factors of the reinforced direction of fibers and unit cell of preforms.
Synthesis of 6-(10-Alkylphenothiazine-3-vinylene)-2-methyl-4-dicyanomethylene-4H-pyran
Chung, Pyung-Jin ; Sung, Jin-Hee ;
Applied Chemistry for Engineering, volume 18, issue 6, 2007, Pages 587~591
10-Alkylphenothiazine-3-vinylene)-2-methyl-4-dicyanomethylene-4H-pyran derivatives were synthesized by Knoevenagel condensation. They are red-emitting materials for organic light emitting device (OLED) which composed of electron donor of 6-(10-Alkylphenothiazine-3-vinylene) groups and electron acceptor of -2-methyl-4-dicyanomethylene-4H-pyran groups by a conjugated structure. The structural properties of reaction products were analyzed FT-IR and 1H-NMR spectroscopy. The thermal stabilities and reactivities were measured by melting points and yields. The UV-visibles and PL properties can be determined by exitation spectra and emission spectra, respectively.
Adsorption of Amine and Sulfur Compounds by Cobalt Phthalocyanine Derivatives
Lee, Jeong-Se ; Lee, Hak-Sung ;
Applied Chemistry for Engineering, volume 18, issue 6, 2007, Pages 592~598
The adsorption capability of cobalt phthalocyanine derivatives was investigated by means of X-ray diffractometor (XRD), FT-IR spectroscopy, scanning electron microscopy (SEM), and temperature programmed desorption (TPD). According to TPD results for ammonia, cobalt phthalocyanine derivatives showed two desorption peaks at low temperature (100∼150℃) and high temperature (350∼400 ℃) indicating that there were two kinds of acidities. Tetracarboxylic cobalt phthalocyanine (Co-TCPC) has a stronger desorption peak (chemical adsorption) at high temperature and a weaker desorption peak (physical adsorption) at low temperature than cobalt phthalocyanine (Co-PC). The specific surface areas of Co-TCPC and Co-PC were 37.5 and 18.4 m2/g, respectively. The pore volumes of Co-TCPC and Co-PC were 0.17 and 0.10 cm3/g, respectively. The adsorption capability of triethyl amine calculated by breakthrough curve at 120 ppm of equilibrium concentration was 24.3 mmol/g for Co-TCPC and 0.8 mmol/g for Co-PC. The removal efficiencies of dimethyl sulfide of Co-TCPC and Co-PC in batch experiment of 225 ppm of initial concentration were 92 and 18%, respectively. The removal efficiencies of trimethyl amine of Co-TCPC and Co-PC in batch experiment of 118 ppm of initial concentration were 100 and 17%, respectively.
Studies on Charge/Discharge Behaviors according to Electrochemical Activation of Green Cokes Type Mesocarbon Microbeads
Roh, Kwang-Chul ; Park, Jin-Bae ; Park, Chul-Wan ;
Applied Chemistry for Engineering, volume 18, issue 6, 2007, Pages 599~602
23 F/cc grade new type of high density activated carbon from crystalline green cokes type of mesocarbon microbeads has been synthesized by chemical and electrochemical activation. In order for these materials to have high performance, electrochemical behavior during electrochemical activation has been investigated by sequential voltage applying schemes. These results showed that the effective voltage for electrochemical activation was about 2.7∼3.2 V irrelevant to applying voltage due to the decrease of surface activation of activated carbon with high specific surface area.
Study of 1,2-Dichlorobenzene Adsorption Characteristics on Graphite using Moment Method
Nam, Kyung-Soo ; Kwon, Sang-Soog ; Yoo, Kyung-Seun ;
Applied Chemistry for Engineering, volume 18, issue 6, 2007, Pages 603~606
Gas chromatograph equipped with ECD (Electron Ionization Detector) was used to investigate the adsorption characteristics of 1,2-dichlorobenzene, which has a similar structure with dioxin, on graphite. Equilibrium adsorption constants of 1,2-dichlorobenzene on graphite were measured as 10.333, 6.167 and 4.270 m3/kg at 220, 240, 260 ℃, respectively. The isosteric heat of adsorption of 1,2-dichlorobenzene on graphite was 11.554 kcal/mol. This was because specific surface area was low and the amount of surface functional groups was small.
Preparation and Characterization of the Histidine-graft-Low Molecular Weight Water-Soluble Chitosan as a Gene Carrier
Park, Jun-Kyu ; Kim, Dong-Gon ; Choi, Chang-Yong ; Nah, Jae-Woon ; Jang, Mi-Kyeong ;
Applied Chemistry for Engineering, volume 18, issue 6, 2007, Pages 607~611
To improve transfection efficiency, we prepared histidine-low molecular weight water-soluble chitosan (LMWSC) having the potential to form complex with DNA as a cationic polymer. Histidine-LMWSC was synthesized by the esterification reaction and removing phthaloyl group. The histidine-LMWSC was characterized using FT-IR, 1H NMR spectra. Histidine-LMWSC was complexed with plasmid DNA (pDNA) in various polymer/DNA (N/P) weight ratios, and the complex was identified using gel retardation assay. The particle sizes of the hisitidine-LMWSC/DNA complexes were measured on a DLS instrument by fixing the histidine-LMWSC/DNA weight ratio of 10/1. Owing to the utilization of a large excess amount of cationic LMWSC against anionic DNA, the particle size of histidine-LMWSC/DNA complexes was in the range of 100∼200 nm. Therefore, histidine-LMWSC will be useful in the development of gene carriers.
Effect of Food Waste Direct Landfilling Prohibition on Characteristics of Landfill Gas and Leachate
Ko, Jae-Young ; Park, Joon-Seok ; Phae, Chae-Gun ;
Applied Chemistry for Engineering, volume 18, issue 6, 2007, Pages 612~617
This research was performed to evaluate the effect of ‘Food Wastes (FW) Direct Landfilling Prohibition’ on characteristics of landfill gas (LFG) and leachate and the appropriateness of current legislation. Approximately 45% (Exp.45) and 15% (Exp.15) of FW were filled in two lysimeters. During 570 days, 1400 L of LFG was generated from Exp.45%, which was much more than 906 L of Exp.15. There was no significant difference of LFG composition between Exp.15 and Exp.45. 2∼30 ppmv of odorous hydrogen sulfide was detected in Exp.45, while 2∼7 ppmv was in Exp.15. There was also no significant difference in the leachate generation between the two. On day 570, BOD5 of Exp.45 and Exp.15 were 37000 mg/Land 25630 mg/L and CODCr of Exp.45 and Exp.15 were 45480 mg/L, 30294 mg/L. TOC of Exp.45 was 2∼3 times higher than Exp.15. Higher portion of FW in landfilling increased LFG generation. However, it generated more odor and made the quality of leachate. Therefore, ‘FW direct Landfilling Prohibition’ was evaluated as an appropriate legislation.
Effect of Cu Addition in Cu/Fe/Zr-Mixed Metal Oxide Mediums for Two-step Thermochemical Methane Reforming
Cha, Kwang-Seo ; Kim, Hong-Soon ; Lee, Dong-Hee ; Jo, Won-Jun ; Lee, Young-Seak ; Kim, Young-Ho ;
Applied Chemistry for Engineering, volume 18, issue 6, 2007, Pages 618~624
thermochemical methane reforming consisting of two steps on Cu/Fe/Zr mixed oxide media was carried out using a fixed bed infrared reactor. In the first step, the metal oxide was reduced with methane to produce CO, H2 and the reduced metal oxide in the temperature of 1173 K. In the second step, the reduced metal oxide was re-oxidized with steam to produce H2 and the metal oxide in the temperature of 973 K. The reaction characteristics on the added amounts of Cu in Cu/Fe/Zr mixed oxide media and the cyclic tests were evaluated. With the increase of the added amount of Cu in Cu/Fe/Zr mixed oxide media, the conversion of CH4, the selectivity of CO2 and the H2/CO molar ratio were increased, while the selectivity of CO was decreased in the first step. On the other hand, the evolved amount of H2 was decreased with increasing the added amount of Cu in the second step. The CuxFe3-xO4/ZrO2 medium added with Cu of x = 0.7 showed good regeneration properties in the 10th cyclic tests indicating that the medium had high durability. In addition, the gasification of the deposited carbon in the water splitting step was promoted with the addition of Cu in the media.
Antioxidantive Effectiveness of Trichosanthes kirilowii Maximowicz Extracts
Zhoh, Choon-Koo ; Uhm, Tae-Yong ; Kim, Joo-Chan ;
Applied Chemistry for Engineering, volume 18, issue 6, 2007, Pages 625~629
Recently, there is a growing interest about unsaturated lecithin having excellent characteristics of skin affinity and absorbency. Accordingly, this study intended to develop a natural sulfuration material in order to enhance the stability of oxidation of unsaturated lecithin and substitute existing sulfuration materials which indicate variability and toxicity. As sulfuration components, plenol acid family, 3,5-dihydroxybenzoic acid, and flavanone were analyzed. Total polyphenol content was higher in the root extracts (133.85 mg/g) than in the fruit extracts (53.5 mg/g). Above 100 ppm polyphenol content, the free radical removal efficiency and lipid oxidation prevention of the root extracts were 20.1 and 19.2% superior compared with BHT respectively. Also, the extracts indicated high survival rate of more than 95% below 1250 ppm, showing the stability. For the stability of liposome made from an unsaturated lecithin, the root extracts were superior to the fruit extracts. Especially, 15.1 and 13.9% of sulfuration effect and zeta potential were improved with 9.3% reduced particle size compared with BHT as the control group, respectively.
Enantioselective Phenolic Kinetic Resolution of Epoxides Catalyzed by New Chiral Salen Complexes
B.Kawthekar, Rahul ; Lee, Kwang-Yeon ; Kim, Geon-Joong ;
Applied Chemistry for Engineering, volume 18, issue 6, 2007, Pages 630~635
New chiral Co-salen complexes with one C3-tBu group in the structure have been synthesized and applied as a chiral catalyst. A dimeric chiral salen having aluminum group metal salts such as AlCl3 displayed very high catalytic reactivity and enantioselectivity for the asymmetric ring opening of epoxides to synthesize optically pure α-aryloxy alcohols via phenolic kinetic resolution. The salen complexes immobilized on the inorganic support were also used as effective catalysts in that reaction. The identity of metal salts in the new chiral salen complex has proved to be important in the enantioselective reactions.
Software Development for the Analysis and Prediction of Packing Density of Multi-sized Mixture Particles
Oh, Min ; Hong, Seong-Uk ;
Applied Chemistry for Engineering, volume 18, issue 6, 2007, Pages 636~642
Software program to predict the packing density of multi-sized and multi-component particulate system was developed. For this purpose, the experiment to measure the packing density of AP (ammonium perchlorate) and Al (aluminum) particles with different sizes and their mixtures was carried out. The packing densities obtained from various experiments were compared with the predicted data from the developed software program. In the case of the packing density of the binary system, which is comprised of two different size particles and/or two different components, the relative errors were ranged 0.25∼13.13%, and in the same venue the relative errors of the ternary system were 0.25∼13.13%. Agreement between experimental data and the predicted results is reasonably accurate. In order to achieve the targeted packing density, the software program calculated the contour of the component particles and this will contribute the formulation of optimal packing systems. Keywords: packing density; software program; multi-sized/
Molecular Dynamics Simulation Study of Lipase-catalyzed Esterification of Structural Butanol Isomers in Supercritical Carbon Dioxide
Kwon, Cheong-Hoon ; Jeong, Jeong-Yeong ; Song, Kwang-Ho ; Kim, Seon-Wook ; Kang, Jeong-Won ;
Applied Chemistry for Engineering, volume 18, issue 6, 2007, Pages 643~649
Lipase-catalyzed esterification of structural butanol isomers and n-butyric acid was investigated in supercritical carbon dioxide. The experiments were performed in a high pressure cell for 5 hrs with a stirring rate of 150 rpm at 323.15 K and 130 bar. The Candida Antarctica lipase B (CALB) was used in whole system as a catalyst. The experimental results were analyzed by GC-FID using a INNOWax capillary column. The conversion yield and the tendency of the esterification in supercritical carbon dioxide were compared with estimated results by molecular dynamics simulation. Based on the Ping-Pong Bi-Bi mechanism with competitive inhibition, each step of the reaction was optimized; using this result the transition state was predicted. Conformational preference of isomers was also analyzed using molecular dynamics simulations. This kind of approach will be further extended to the prediction of enzyme-catalyzed reactions using computers.
Powder Sensitized with Quinacridone
Jung, Mie-Won ; Kwak, Yun-Jung ;
Applied Chemistry for Engineering, volume 18, issue 6, 2007, Pages 650~653
SnO2-doped TiO2 powder was obtained from tin (IV) bis(acetylacetonate) dichloride and titanium diisopropoxide bis(acetylacetonate) with quinacridone as the dye sensitizer molecule. The structural changes of the reaction mixture were monitored by fourier transform infrared (FT-IR) spectroscopy. The morphology and microstructure of gel powder were studied by field-emission scanning electron microscopy (FE-SEM) and X-ray diffractometry (XRD). The photocatalytic activity of these powders with the anatase structure was investigated by using indigo carmine solution as a test dye