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REFERENCE LINKING PLATFORM OF KOREA S&T JOURNALS
> Journal Vol & Issue
Korean Chemical Engineering Research
Journal Basic Information
Journal DOI :
The Korean Institute of Chemical Engineers
Editor in Chief :
KIM JAE JEONG
Volume & Issues
Volume 48, Issue 6 - Dec 2010
Volume 48, Issue 5 - Oct 2010
Volume 48, Issue 4 - Aug 2010
Volume 48, Issue 3 - Jun 2010
Volume 48, Issue 2 - Apr 2010
Volume 48, Issue 1 - Feb 2010
Selecting the target year
Anode Properties of
Nanotube for Lithium-Ion Batteries
Choi, Min-Gyu ; Lee, Young-Gi ; Kim, Kwang-Man ;
Korean Chemical Engineering Research, volume 48, issue 3, 2010, Pages 283~291
In this review, the studies on the electrochemical properties of
nanotube as an anode material of lithium-ion battery, which was prepared by an alkaline hydrothermal reaction and anneling process, were investigated andanalyzed in terms of charge-dischage characteristics. Up to date, a maximum discharge capacity of 338 mAh
was achieved by the nanotube with
phase, whereas the theoretical capacity of
anode was 335mAh
in the basis of
as a product of electrochemical reaction between
and lithium. This was due to fast lithium transport by a shortened diffusion path provided by controlling the nanostructure of
, because the self-diffusion of lithium was slow in a basis of its activation energy as 0.48 eV. Due to an excellent ion storage capabilities in both the surface and the bulk phase, the
nanotube could be a promising active material as both an anode of lithium-ion battery and an electrode of capacitor with high-rate performances.
Electrode Properties of Graphene and Graphene-Based Nanocomposites for Energy Storage Devices
Kim, Kwang-Man ; Lee, Young-Gi ; Kim, Sang-Ouk ;
Korean Chemical Engineering Research, volume 48, issue 3, 2010, Pages 292~299
Graphene is a two-dimensional nanosheet consisting of honeycomb lattices of
carbon atoms. It is one of promising active materials for the anode of lithium-ion battery and the electrode of supercapacitor, due to its large specific surface area(theoretically 2600
), high electric conductivity(typically
), and mechanical strength. In this review, the synthetic methods of graphene nanosheet and graphene-based nanocomposite are introduced. Also, the electrochemical properties obtainable when the graphene-based materials are adopted to the electrodes of lithium-ion battery and supercapacitor are discussed along with their nanostructures.
Present Condition on the Recycling and Management for Waste Acids
Sim, Yeon-Ju ; Kim, Eui-Yong ;
Korean Chemical Engineering Research, volume 48, issue 3, 2010, Pages 300~303
Environmental issues on the waste emission and its treatment are of great interest in these days. In order to resolve the pollution problems, recycling the waste materials is generally recommended. Especially, emission of waste acids in designated sources is increasing every year. In this study, we focused on the effective recycling of the waste acids rather than treatments. Management systems of the waste acids are not systematically designed, and the quality of the waste regulation on the recycling product is unclear in domestic and foreign countries. We surveyed the present conditions on domestic waste emission and recycling of waste acids. For the final analysis of the recycling products, iron chloride, iron sulfate, copper cyanide, copper oxides, and cement copper are selected as candidates. We expect that this article would help establishing the systematic management system on treating the waste acid materials.
Incorporation on Catalytic Performance and Physico-Chemical Properties of Iron-Based Catalysts for the Fischer-Tropsch Synthesis
Hyun, Sun-Taek ; Chun, Dong-Hyun ; Kim, Hak-Joo ; Yang, Jung-Hoon ; Yang, Jung-Il ; Lee, Ho-Tae ; Lee, Kwan-Young ; Jung, Heon ;
Korean Chemical Engineering Research, volume 48, issue 3, 2010, Pages 304~310
The FTS(Fischer-Tropsch synthesis) was carried out over precipitated iron-based catalysts with or without
in a fixed-bed reactor at
and 1.5 MPa. The catalysts with
showed much higher catalytic activity for the FTS than those without
, displaying excellent stability during 144 h of reaction. The X-ray diffraction and
physisorption revealed that the catalysts with
showed enhanced dispersion of
compared with those without
. Also, the results of temperature-programmed reduction by
showed that the addition of
markedly promoted the reduction of
and FeO at low temperatures below
. In contrast, surface basicity of the catalysts, which was analyzed by temperature-programmed desorption of
, decreased as a result of
addition. We attribute the high and stable performance of the catalysts with
to the improved dispersion and reducibility by the
Decrease of PEMFC Performance by
Lee, Ho ; Song, Jin-Hoon ; Kim, Ki-Joong ; Kim, Sae-Hoon ; Ahn, Byung-Ki ; Lim, Tae-Won ; Park, Kwon-Pil ;
Korean Chemical Engineering Research, volume 48, issue 3, 2010, Pages 311~315
The effects of
on the performance of proton exchange membrane(PEMFC) were investigated by introduction air containing
into cathode inlet of PEMFC. And the recovery of the cell performance by applying clean air, cycle voltammetry(CV) and high voltage holding following exposure contaminated air was studied. The
concentration range used in the experiments was from 20 ppb to 1.3 ppm. The performance degradation and recovery were measured by constant-current discharging, I-V polarization and electrochemical impedance spectroscopy(EIS). The cell voltage gradually decayed with time and decreased by 17 mV after 200 hours of 20 ppb
injection. The cell performance can be recovered partially by clean air flushing, CV and high voltage holding due to desorption of S from Pt catalyst.
Catalytic Reduction over Sn-Zr Based Catalyst under High Pressure Condition
Park, Jung-Yun ; Park, No-Kuk ; Lee, Tae-Jin ; Baek, Jeom-In ; Ryu, Chong-Kul ;
Korean Chemical Engineering Research, volume 48, issue 3, 2010, Pages 316~321
catalytic reduction was carried out under the condition of high pressure in this study. Sn-Zr based oxide and CO were used as the catalyst and reducing agent for the reduction of
to element sulfur, respectively. In order to compare the reactivity with the pressure on the catalytic process, the reactivity tests were performed under the conditions of atmospheric pressure and 20 atm.
conversion, the element sulfur yield and COS selectivity were also compared with changing the reaction temperature, CO/
mole ratio and the space velocity(GHSV).
conversion increased with increasing temperature and CO/
mole ratio under the condition of atmospheric pressure and element sulfur yield decreased due to the production of COS by the series reaction of CO and the produced sulfur. However, high
conversion and high element sulfur were obtained under the condition of 20 atm. It was concluded that COS decreased due to the condensation of the produced element sulfur under the condition of high pressure. Therefore, the high sulfur yield for
catalytic reduction could be profitably obtained under the condition of high pressure.
Study on the Stability of
Solution during Storage Process
Sim, Woo-Jong ; Jo, Jae-Young ; Choi, Dae-Ki ; Nam, Suk-Woo ; Park Kwon-Pil ;
Korean Chemical Engineering Research, volume 48, issue 3, 2010, Pages 322~326
Stability of sodium borohydride solution during storage was studied. In order to enhance the
stability, NaOH and KOH were added to the
solution. The effect of concentration of the borohydride and alkaline solution, temperature and materials of storage vessels on the rate of borohydride hydrolysis was investigated. The rate of hydrogen evolution decreased as the concentration of alkaline increased due to increase of
stability in the solution. The stability of
solution decreased when the borohydride concentration raised from 10 to 15 wt% and then increased when the
concentration increased above 15 wt% due to increase in the pH of the concentrated solution. The activity coefficient of hydrolysis of
solution(NaOH 3.0 wt%,
25 wt%) was 115.1 kJ/mol and this value was 1.5~4.0 times higher than that of hydrolysis of
solution with catalyst. The borohydride solutions in glass and stainless-steel vessel were more stable than the solution in plastic(PE) vessel.
Functional Cosmetic Effect of Porcine Placeta
Kim, Bo-Young ; Kim, Ta-Gon ; Kang, Whan-Yul ; Baek, Hyun ; Cheon, Hae-Young ; Kim, Dong-Uk ;
Korean Chemical Engineering Research, volume 48, issue 3, 2010, Pages 327~331
Porcine placenta was treated with alkali, acid and enzyme treatment to obtain extracts. Heavy metal contents such as Pb, As, and Hg were low enough to satisfy cosmetic agent standard. As a result of safety test(MTT assay), porcine placenta extracts showed over 80% of cell viability at
, and cell toxicity was relatively lower. From antioxidation test using DPPH free radical scavenging assay, antioxidation effect was highest as 63% at
when porcine placenta was treated with alkali in pH 9. From whitening effect test using tyrosinase inhibition assay, tyrosinase inhibition effect was 30% at
concentration in alkali treated procine placenta, however, the efficiency was lower compared with arbutin or vitamin C. In anti-wrinkle effect test from elastase inhibition assay, elastase inhibition effects were 20~30% at
for 5 kinds of porcine placenta treatments, which was superior to standard, and especially, protease treated extracts showed best results. Skin formulation including 1% porcine placenta was made and the formulation was very stable for temperature and storage period. From this research, porcine placenta extract showed high potential for anti-wrinkle functional cosmetic agent.
A Kinetic Study on the Synthesis of Dimethylcarbonate by Using Immobilized Ionic Liquid Catalyst
Kim, Dong-Woo ; Kim, Dong-Kyu ; Kim, Cheol-Woong ; Koh, Jae-Cheon ; Park, Dae-Won ;
Korean Chemical Engineering Research, volume 48, issue 3, 2010, Pages 332~336
Ionic liquid immobilized on mesoporous amorphous silica was prepared from the coupling of 1-(triethoxysilylpropyl)-3-n-alkyl-imidzolium halides with tetraethyl orthosilicate(TEOS) through template-free condensation under strong acidic conditions. The immobilized 1-n-butyl-3-methyl imidazolium bromide ionic liquid on amorphous silica(BMImBr-AS) was proved to be an effective heterogeneous catalyst for the synthesis of dimethyl carbonate(DMC) from transesterification of ethylene carbonate(EC) with methanol. High temperature, high carbon dioxide pressure and long reaction time were favorable for the reactivity of BMImBr-AS. Kinetic studies based on two step reactions revealed that the proposed reaction model fitted well the experimental data. The apparent activation energy was estimated to be 67.4 kJ/mol.
Analysis of Fluid Flows in a Stirred Tank Using Computational Fluid Dynamics
Kim, Mi-Jin ; Lee, Kyung-Mi ; Park, Kyun-Young ;
Korean Chemical Engineering Research, volume 48, issue 3, 2010, Pages 337~341
The flow patterns in a stirred tank, 1m in diameter and 1 m in height, were studied using CFX, a commercial computational fluid dynamics program, with the impeller rotation speed, the impeller blade angle and the tank-bottom shape varied and the baffles included or excluded. A vortex was observed in the center of the tank in the absence of the baffles, and the intensity of the vortex increased with increasing the rotation speed. The vortex was considerably reduced in the presence of the baffles. An increase in the blade angle increased the vertical flow and decreased the vortex intensity. The flow in the corners of the tank bottom turned smoother as the tank bottom was varied in shape from flat to round.
Recovery of Lactic Acid Using Reactive Dividing Wall Column
Woo, Dae-Sik ; Cho, Young-Min ; Kim, Bo-kyung ; Hwang, Hwi-Dong ; Han, Myung-Wan ;
Korean Chemical Engineering Research, volume 48, issue 3, 2010, Pages 342~349
Lactic acid is widely used in the food, chemical and pharmaceutical industries, and there is an increasing demand for lactic acid as the raw material of poly lactic acid(PLA), which is a biodegradable polymer. Lactic acid production has been changing over from production by synthesis to production by fermentation, since the fermentation process is more nature friendly and economic. However, the fermentation method generates excess water and impurities with high boilers. The presence of high boilers and non volatility of lactic acid makes the separation of lactic acid very difficult job. Also, the purification-separation process requires the many investment costs and energy costs. Reactive distillation concept was also introduced for the process, giving higher selectivity and yield compared to the convention method. We introduce a new highly integrated process, reactive diving wall column, to reduce the capital and energy cost for producing a pure lactic acid. The reactive dividing wall column combines reactive distillation and dividing wall column. We compared capital and energy consumption required for the purification of lactic acid the between the proposed design structures. And we examined the effect of major process variables on the process performance and determined optimal process.
Biomineralization on Polydiacetylene Patterns Deposited by Using a Novel Mini Arrayer
Lee, Won-Doc ; Lee, Gil-Sun ; Ahn, Dong-June ;
Korean Chemical Engineering Research, volume 48, issue 3, 2010, Pages 350~354
In natural world various inorganic crystals are grown with controlled shape and size in hybrid forms with organics. Such natural processes have been attempted much to mimick artificially. One of the example is calcium carbonate which has been examined a lot in the field of biomineralization. In this study, we utilize well-organized surface of polydiacetylene(PDA) films as the crystal-growing template. We devised a novel mini-arrayer device that transfers PDA films at air/water interfaces of each array well and deposit them to hydrophobized glass substrates. This technical improvement will contribute to facilitate better understandings of biomineralization mechanism.
Influence of Inductively Coupled Plasma on Surface Properties of Polycarbonate
Won, Dong-Su ; Lee, Won-Gyu ;
Korean Chemical Engineering Research, volume 48, issue 3, 2010, Pages 355~358
Inductively coupled low temperature plasmas with oxygen, argon, mixture of oxygen and argon, and nitrogen have been used to modify polycarbonate(PC) films at the various process conditions. All plasma treatments generally had a tendency to increase the surface roughness of PC regardless of process conditions. The treatment of oxygen plasma showed the highest value in the surface roughness and mostly enhanced the generation of oxygen containing polar groups as much as 43% in comparison of untreated PC. The contact angle of untreated PC decreased from
to the lowest value of
after oxygen plasma treatment. The increase of RF delivered power had an effect on the rapid reduction of contact angle, but gas flow rates did not effect to reduce contact angles so much.
Holdup Characteristics of Three Functional Regions in a Slurry Bubble Column
Jang, Ji-Hwa ; Lim, Dae-Ho ; Kang, Yong ; Jun, Ki-Won ;
Korean Chemical Engineering Research, volume 48, issue 3, 2010, Pages 359~364
Three kinds of functional regions such as continuous slurry(
) and wake(
) regions were identified, and the individual phase holdups of each functional region were determined in a three-phase slurry bubble column of 0.152 m ID. The holdups of bubble and wake were measured by adopting the electrical resistivity probe method. Effects of gas velocity and solid concentration in the slurry phase on the individual holdups of functional regions in the column were discussed. The holdup of continuous slurry phase decreased but that of bubble or wake increased, with an increase in the gas velocity in the column. The increase of solid content in the slurry phase could lead to the increase in the holdup of continuous slurry phase but decrease in the bubble or wake holdup. The portion of wake holdup was in the range of 15~40% of the bubble holdup, which decreased with increasing gas velocity or solid content in the slurry phase. The individual holdups of three functional regions were well correlated with operating variables within this experimental conditions.
Ash Reduction and the Change of Fuel Properties for Spent Mushroom Substrates by Acid Solution Extraction
Lee, Eun-Jee ; Oh, Doh-Gun ; Kim, Sun-Mee ; Park, Eun-Suk ; We, Sung-Gook ;
Korean Chemical Engineering Research, volume 48, issue 3, 2010, Pages 365~374
The ash reduction effects and fuel property changes of spent mushroom substrates by acid solution extraction, and the production possibilities of wood pellet fuel using them were studied. The ash weight of spent Pleurotus eryngii substrates was reduced from 8.81%(w/w) to 3.33%(w/w), and calorific value was increased from 3,958.3 kcal/kg to 4219.2 kcal/kg when extracted with a mixture of Acetic acid 2%(w/w) and Anhydrous citric acid 1%(w/w) in condition of liquid ratio 1:8, extraction temperature
and extraction time 180 min. The ash weight of spent Flammulina velutipes substrates was reduced from 14.91%(w/w) to 4.07%(w/w), and calorific value was increased from 4,190.3 kcal/kg to 4,219.2 kcal/kg when extracted with a mixture of Acetic acid 3%(w/w) and Anhydrous citric acid 1%(w/w) in condition of liquid ratio 1:8, extraction temperature
and extraction time 180 min. The ash weight of spent Pleurotus osteratus substrates was reduced from 3.31%(w/w) to 0.59%(w/w), and the smallest reduction was in calorific value from 4,558.6 kcal/kg to 4,216.2 kcal/kg when extracted with a mixture of Acetic acid 1%(w/w) and Anhydrous citric acid 1%(w/w) in condition of liquid ratio 1:8, extraction temperature
and extraction time 180 min.
Determination of the Cetane Number, Derived Cetane Number and Cetane Index for Diesel Fuel by Additives
Lim, Young-Kwan ; Kim, Jong-Ryeol ; Jung, Choong-Sup ; Yim, Eui-Soon ; Kim, Dong-Kil ;
Korean Chemical Engineering Research, volume 48, issue 3, 2010, Pages 375~381
Cetane number of diesel fuel for compression ignition engine is one of main properties for fuel ignition quality. Recently the cetane index has been replaced the cetane number in order to resolve the disadvantage of CFR engine test, but these two value have slightly difference values due to addition of various additives. In this study, we analyzed the cetane number, derived cetane number and cetane index for diesel fuel which was blended with various ratios of biodiesel, kerosene and cetane improver as additives. As a result, Cetane number showed the similar value with derived cetane number, but cetane index showed quite different value with cetane number when biodiesel and cetane improver were used as additives.
Treatment of Malodorous Waste Air Using Hybrid System
Lee, Eun-Ju ; Lim, Kwang-Hee ;
Korean Chemical Engineering Research, volume 48, issue 3, 2010, Pages 382~390
In this research hydrogen sulfide, ammonia and toluene were designated as the representative source of malodor and VOC, respectively, frequently generated at the compost manufacturing factory and publicly owned facilities. The optimum operating condition to treat the waste air(2 L/min) containing malodor was constructed using photocatalytic reactor/biofilter process with humidifier composed of fluidized aerobic anf anoxic reactor. The ammonia(300 ppmv) of fed-waste air was removed by 22, 55 and 23% at the stage of photocatalytic reactor, humidifier and biofilter, respectively. The toluene(100 ppmv) of fed-waste air was removed by 20, 10 and 70% at the stage of photocatalytic reactor, humidifier and biofilter, respectively. Therefore the water-soluble ammonia and the water-insoluble toluene were treated mainly at the stage of humidifier and biofilter, respectively. In addition, hydrogen sulfide(10 ppmv) was almost treated at the stage of photocatalytic reactor and its negligible trace was absorbed in humidifier so that it was not detected before biofilter process. The nitrate concentration of the process water from anoxic reactor was found lower by 3 ppm than that from fluidized aerobic reactor. Besides, the dissolved ammonia-nitrogen concentration of the process water from humidifier remained at the high value of 1,500-2,000 ppm, which may be attributed to the existence of ammonium chloride and other source of ammonium nitrogen.
Treatment of Malodorous Waste Air Containing Ammonia Using Biofilter System
Lee, Eun-Ju ; Park, Sang-Won ; Nam, Dao-Vinh ; Chung, Chan-Hong ; Lim, Kwang-Hee ;
Korean Chemical Engineering Research, volume 48, issue 3, 2010, Pages 391~396
In this research the characteristics of ammonia removal from malodorous waste-air were investigated under various operating condition of biofiilter packed with equal volume of rubber media and compost for the efficient removal of ammonia, representative source of malodor frequently generated at compost manufacturing factory and publicly owned facilities. Then the optimum conditions were constructed to treat waste-air containing ammonia with biofilter. Biofilter was run for 30 days(experimental frequency of 2 times/day makes 60 experimental times.) with the ammonia loading from 2.18
. The ammonia removal efficiency reached almost 100% for I through IV stage of run to degrade up to the ammonia loading of 17
. However the removal efficiency dropped to 80% when ammonia loading increased to 35
, which makes the elimination capacity of ammonia 28
for V stage of run. However, the removal efficiency remained 80% and the maximum elimination capacity reached 55
when ammonia loading was doubled 70
for VI stage of run. Thus the maximum elimination capacity exceeded 1,200
) of the experiment of biofilter packed with rock wool inoculated with night soil sludge by Kim et al.. However, the critical loading did not exceed 810
) of the biofilter experiment by Kim et al.. The reason to exceed the maximum elimination capacity of Kim et al. may be attributed to that the rubber media used as biofilter packing material provide the better environment for the fixation of nitrifying and denitrification bacteria to its surface coated with coconut based-activated carbon powder and well-developed inner-pores, respectively.
The Effect of the Wettability of Solid Surface on Printing Pattern in Screen Printing
Park, Jung-Kwon ; Kim, Chong-Youp ;
Korean Chemical Engineering Research, volume 48, issue 3, 2010, Pages 397~400
The interfacial hydrodynamic issues in the screen printing are experimentally investigated by using model inks that are prepared by dispersing alumina nanoparticles in water. The printing patterns of the inks that are passed through differing geometrical shapes of screen on solid surfaces with differing wettability are not solely determined by the pattern on the screen. The dynamic contact angle cannot solely explain the physics of the problem, either. The difference between the screen and printing patterns was not the same for concave and convex corners. Especially the elasticity of ink affects the edge shape.
Evaluation of Cleanliness and Jet Forces by Spray-Type Cleaning Agent for Electronic and Semiconductor Equipment
Heo, Hyo-Jung ; Jung, Young-An ; Row, Kyung-Ho ;
Korean Chemical Engineering Research, volume 48, issue 3, 2010, Pages 401~404
A spray-type cleaning agent in utilizing dust-remover on PCB was chosen to study. In cleaning of electronic and semiconductor equipment, a substrate(IPC-A-36) was used to test the jet forces of the agent. And according to the jet forces time of the cleaning agent, the corresponding moving distances were compared with the spray times, and for the pollutants of iron powder and dust, the cleaning efficiency was tested with the IPC-A-36 by a weight method. The moving distance increased with the spray cleaning time longer. For a spray cleaning time of 3sec, the cleaning efficiency decreased with the amount of dust and the iron powder. It was also observed that the dust was remarkably removed, compared to the iron powder.
Adsorption Measurement of Thin Film Using a Quartz Crystal Resonator
Kim, Byoung-Chul ; Park, Jung-Woo ; Kim, Young-Han ;
Korean Chemical Engineering Research, volume 48, issue 3, 2010, Pages 405~408
A technique to measure the adsorption characteristic of surface area and pore size of a ceramic thin film is proposed, and its performance is examine. The thin film is fabricated directly on the resonator surface to measure the adsorption capacity of the film as it is, and using carbon dioxide makes the measurement easy. The results indicates that the measured surface area is satisfactory, while the pore size has some error. It is suggested that readily available carbon dioxide can be used to determine adsorption capacity of thin film at room temperature.
Drying Characteristics of Municipal Wood Waste
Choi, Jeong-Hoo ; Kim, Min-Ha ; Jo, Mi-Young ; Park, Ki-Hoon ; Jang, Eun-Jin ; Lee, Jong-Min ;
Korean Chemical Engineering Research, volume 48, issue 3, 2010, Pages 409~412
This study investigated and discussed the drying characteristics of municipal wood wastes (wood, particle board, medium density fiber-board(MDF)) in the
environment with an isothermal thermogravimetric analyzer. The drying rate could be expressed by a first order reaction model on remaining fraction of moisture. The activation energy ranged from 12.72 kJ/g mol to 18.31 kJ/g mol and the frequency factor from 0.2155 1/s to 1.249 1/s.