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REFERENCE LINKING PLATFORM OF KOREA S&T JOURNALS
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Journal DOI :
The Korean Society of Clean Technology
Editor in Chief :
Volume & Issues
Volume 14, Issue 4 - Dec 2008
Volume 14, Issue 3 - Sep 2008
Volume 14, Issue 2 - Jun 2008
Volume 14, Issue 1 - Mar 2008
Selecting the target year
Solubility of Triclosan in Supercritical Carbon Dioxide and its Application to Micronization Process
Shin, Moon-Sam ; Kim, Hwa-Yong ;
Clean Technology, volume 14, issue 3, 2008, Pages 153~159
The solubility of triclosan, an anti-acne agent was measured in supercritical carbon dioxide (
) with a variable volume view cell at 313.15, 323.15, and 333.15 K and at pressures between 10 and 40 MPa. We successfully correlated triclosan solubility in
using the quasi-chemical nonrandom lattice fluid (QLF) equation of state. Triclosan was micronized using the rapid expansion of supercritical solutions (RESS) process. The effects of temperature and pressure on particle size were investigated using phase behavior data and correlated results from the QLF model.
Synthesis of Dimethyl Carbonate by Oxidative Carbonylation of Methanol over Cu Catalysts
Park, Jin-Seok ; Suh, Young-Woong ; Park, Tae-Jin ; Suh, Dong-Jin ;
Clean Technology, volume 14, issue 3, 2008, Pages 160~165
The synthesis of dimethyl carbonate (DMC) with Cu catalysts was investigated in a semi-batch high-pressure reactor. DMC was synthesized via the direct oxidative carbonylation of carbon monoxide with oxygen in methanol. The corrosion rate was evaluated fie the weight change for SUS test pieces which had been added into the reactor. In order to reduce the corrosion rate without significantly losing DMC yield, various additives such as amines, olefins, and other metal salts were used. When 1-methylimidazole was used as an additive, 18.6% of DMC yield could be obtained without corrosion. If the amount of 1-methylimidazole was decreased, a high DMC yield (33.2%) could be obtained with a low corrosion rate (0.5%).
Cycloaddition of Carbon Dioxide to Allyl Glycidyl Ether Using Silica-supported Ionic Liquid as a Catalyst
Shim, Hye-Lim ; Lee, Mi-Kyung ; Yu, Jeong-In ; Park, Dae-Won ;
Clean Technology, volume 14, issue 3, 2008, Pages 166~170
In this study, imidazolium salt ionic liquid on amorphous silica was prepared and its catalytic performance in the cycloaddition of
with allyl glycidyl ether (AGE) to produce heterocyclic carbonate was investigated. The ionic liquid was generated on chloropropyl functionalized silica through the immobilization of imidazole. The prepared catalyst was characterized using a number of instrumental analysis including XRD, BET,
MAS-NMR and SEM.
MAS-NMR showed that the ionic liquid formed adduct with the chloropropyl groups attached to the silica surface. The immobilized ionic liquid showed very good catalytic activity for the cycloaddition of
with AGE, showing 55-61% of AGE conversion with over 85% of the carbonate selectivity at
. Its AGE conversion and selectivity to the carbonate were even higher than the homogeneous analog, 1-n-butyl-3-methyl imidazolium bromide (BMImBr).
Dopant on the Electrochemical Characteristics Of Spinel-type
Jeong, Choong-Hoon ; Lee, Eui-Kyung ; Bang, Jong-Min ; Lee, Bong-Hee ; Cho, Byung-Won ; Na, Byung-Ki ;
Clean Technology, volume 14, issue 3, 2008, Pages 171~175
The effect of the addition of
dopant on the electrochemical characteristics of
is known as a 2ero-strain material, and
has been manufactured by solid-state reaction with high energy ball milling (HEBM). The samples were heated at 800, 900 and
in electric furnace. The structural and surface structures were measured by XRD (X-ray diffraction) and SEM (scanning electron microscopy). Cut-off voltage of charge/discharge cycles was
to investigate reversible capacity, cycle stability and plateau voltage. The reversible capacity of
was 138 mAh/g.
A Study of
-aldehyde Synthesis from n-Butene
Jeon, Jong-Ki ; Park, Seong-Ki ; Park, Young-Kwon ;
Clean Technology, volume 14, issue 3, 2008, Pages 176~183
The purpose of this study is to upgrade the catalysts for synthesizing mixed octenes using normal butene and the catalysts for synthesizing
-aldehyde through hydroformylation of mixed octenes with syngas. The in-line activation method with circulating activating solution was effective for activation of the
catalyst. The reason for catalyst deactivation may be ascribed to physi-sorbed materials or oligomers which block pore entrance and then prevent active sites from participating a reaction. Continuous distillation apparatus was used for separating mixed octenes from dimerization products. When reflux ratio was above 3 : 1, mixed octene fraction of which purity was above 99.57% was obtained. In
-aldehyde synthesis through hydroformylation of mixed octenes, we investigated a performance of ligand which increased catalyst stability as well as activity of Co catalyst. The results indicated that TPPO, NMP, NDMA, and succinonitrile were suitable ligand for increasing initial activity and reducing loss of Co during catalyst recovery.
A Study on Applicability of Hydrofluoroethers as CFC-Alternative Cleaning Agents
Min, Hye-Jin ; Shin, Jin-Ho ; Bae, Jae-Heum ; Kim, Hong-Gon ; Lee, Hyun-Joo ;
Clean Technology, volume 14, issue 3, 2008, Pages 184~192
Fluoride-type cleaning agents such as 2,2,2-trifluoroethanol (TFEA) and hydrofluoroethers (HFEs) do not destroy ozone in the stratosphere and have low global warming potential compared to hydrofluorocarbons(HFCs) and hydrochlorofluorocarbons (HCFCs). Especially, HFEs which have no flash point are paid attention as next generation type of cleaning agents for chlorofluorocarbons (CFCs) since they are safe in handling and have excellent penetration ability compared to hydrocarbon cleaning agents with low flash point. Here, the physical properties and cleaning abilities of fluoride-type cleaning agents such as TFEA, HFE-7100, HFE-7200, HFE-476mec, HFE-449mec-f, AE-3000 and AE-3100E and silicide-type cleaning agents such as trifluoroetoxytrimethylsilane (TFES) and hexamethyldisilazane (HMDS) were measured and compared with those of ozone destruction substances such as CFC-113 and 1,1,1-trichloroethane. They were also compared with toxic methylene chloride (MC) and isopropyl alcohol (IPA) which are now being used as an alternative cleaning agents. As a result, TFEA and HFEs had lower cleaning ability for removal of various soils compared to chloride-type cleaning agents, but they showed excellent cleaning ability fur fluoride-type soils. TFES and HMDS also showed excellent cleaning ability for silicide-type soils.
Development of Perfluoroalkyl Derivative for
Adsorbent Promotion Process
Shin, Jong-Sub ; Kum, Chang-Hun ; Yun, Jong-Kuk ; Park, Il-Kyu ;
Clean Technology, volume 14, issue 3, 2008, Pages 193~203
A surfactant is used to assist the effect of cleaning, dispersibility and adhesion during leather manufacturing process. Existing surfactant for that process includes many hydrophilic groups that may cause problem such as stain, bad water resistance and poor durability, etc. It is potential problem to make high-performance property for future leather market. In this study, we have synthesized the fluorinated surfactant of which property decreases surface tension, increases dispersion, cleaning effect and the better chrome absorption by the high bond energy of C-F to complement weakness that the present alkyl derivative surfactants have. Using fluorinated surfactant, we can confirm that dispersion is increased, chrome absorption ratio is augmented with high osmosis and coherence, chrome content in the tanning waste water is reduced, BOD and COD contents are diminished and physical characteristics are improved.
Selective Catalytic Oxidation of Hydrogen Sulfide Using
Catalyst Prepared by Nonhydrolytic Sol-Gel Method
Kim, Sang-Yun ; Cho, Dal-Rae ; Park, Dae-Won ;
Clean Technology, volume 14, issue 3, 2008, Pages 204~210
A series of
xerogel catalysts were prepared by nonhydrolytic sol-gel method and analysed by various characterization techniques. These catalysts showed much higher surface areas and total pore volumes than conventional V
xerogel and impregnated
catalysts. It was found that the textural property of
material varies with the method and conditions of synthesis. Surface vanadates and
anatase phase are the crucial factors to obtain high catalytic activities. The selective oxidation of hydrogen sulfide in the presence of excess water and ammonia was studied over these catalysts. Xerogel catalysts prepared by non-hydrolytic sol-gel method showed very high conversion of
without harmful emission of
. The highest catalytic activity shown by these
catalysts may be due to their high surface area and good dispersion of vanadia species in the titania matrix.
Decolorization of Reactive Black 5 by Photocatalytic Oxidation
Yang, Jeong-Mok ; Song, Jin-Su ; Park, Chul-Hwan ; Kim, Sang-Yong ;
Clean Technology, volume 14, issue 3, 2008, Pages 211~217
We investigated the reduction of pollutants such as TOC (total organic carbon) and decolorization of Reactive Black 5 (RB5) by photocatalytic oxidation. The optimal values of major parameters for the reaction were obtained including the concentration of RB5, the amount of
dosage and pH of solution. The values were 100 mg/L, 2 g/L and 4.9, respectively. As the concentration of oxygen increased, removal rate of pollutants increased. After
was regenerated and used again by micro filtration (MF) ceramic membrane, the removal efficiency of color and removal rate of pollutants did not decrease significantly.
Decomposition of Toxic Chemicals in Microemulsion by Electrolytic Oxidation Method
Shim, Sung-Hyun ; Chun, Byoung-Chul ; Chung, Yong-Chan ;
Clean Technology, volume 14, issue 3, 2008, Pages 218~223
Decomposition of reactive organic compound dispersed in microemulsion media by hydroxide ions and proton ions generated during electrolysis was tried and the half-lifes for decomposition were compared. Absorbance of p-nitrophenoxide produced from the decomposition of p-nitrophenylacetate (PNPA) was followed to find the rate of decomposition. The applied voltage, temperature, and the amount of substrate were changed to see the effects on the decomposition rate. The advantages of electrolysis in microemulsion system were the high solubilizing capacity of substrate, easy control of decomposition rate, low operation cost, no need for any addition of chemicals, and no byproducts. The mechanism of decomposition and the application to water purification were discussed.