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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 52, Issue 6 - Dec 2014
Volume 52, Issue 5 - Oct 2014
Volume 52, Issue 4 - Aug 2014
Volume 52, Issue 3 - Jun 2014
Volume 52, Issue 2 - Apr 2014
Volume 52, Issue 1 - Feb 2014
Selecting the target year
Droplet-based Microfluidic Device for High-throughput Screening
Jeong, Heon-Ho ; Noh, Young-Moo ; Jang, Sung-Chan ; Lee, Chang-Soo ;
Korean Chemical Engineering Research, volume 52, issue 2, 2014, Pages 141~153
DOI : 10.9713/kcer.2014.52.2.141
Droplet based microfluidic systems have been developed for the application of biological and chemical research field. A picoliter droplet in microfluidic device provides a compartmentalized and well-defined reactor in miniaturized system. The microfluidic system with small droplets can reduce reagent cost and enhance efficiency through automated high-throughput screening system. In this review, we summarize the functionality of droplet based microfluidic system including droplet generation, precise droplet control, and various applications. In addition, this article reviews current applications in chemistry and biology, and discuss advantages of droplet based microfluidics compared with conventional manner.
Recent Water Treatment Technology for Unconventional Natural Resource Development
Kim, Geug Tae ; Chung, Kun Yong ; Park, Jung Kyu ;
Korean Chemical Engineering Research, volume 52, issue 2, 2014, Pages 154~165
DOI : 10.9713/kcer.2014.52.2.154
Development of unconventional natural resources such as shale gas, shale oil and coal bed methane, has been activated and improved the productivity due to the recent technology advance in horizontal drilling and hydraulic fracturing. However, the flowback water mixed with chemical additives, and the brine water containing oil, gas, high levels of salts and radioactive metals is produced during the gas production. Potential negative environmental impact due to large volumes of the produced wastewater is increasingly seen as the major obstacles to the unconventional natural resource development. In this study an integrated framework for the flowback and brine water treatment is proposed, and we reviewed the upcoming state of the art technology in water treatment. Basic separation processes which include not only membrane, evaporation, crystallization and desalination processes, but the potential water reuse and recycling techniques can be applied for the unconventional natural resource industry.
A Study on Acceleration Aging Characteristics of B-KNO
Paik, Jong Gyu ; Ryu, Byung Tae ; Kwon, Mira ;
Korean Chemical Engineering Research, volume 52, issue 2, 2014, Pages 166~174
DOI : 10.9713/kcer.2014.52.2.166
This research investigated the aging properties of the
system as the igniter. The
system showed the degradation in ignition properties depending on the method and period of storage. It should be found out the cause of the degradation to predict the reliability of the igniters. The changes of the properties by the degradation after aging tests were analyzed by microstructure analysis, XRD analysis and thermal analysis using DSC. It was found out that the lattice parameters of the
as the oxidizer in the ignition system was changed into the JCPDS values as the aging time increased. Conclusively, the changes of the crystal structure of oxidizer affected the activation energy increasing as aging time increased.
Characteristics of Microbial Fuel Cells Using Livestock Waste and Degradation of MEA
Kim, Young-Sook ; Chu, Cheun-Ho ; Jeong, Jae-Jin ; Ahn, Myung-Won ; Na, Il-Chai ; Lee, Jeong-Hoon ; Park, Kwon-Pil ;
Korean Chemical Engineering Research, volume 52, issue 2, 2014, Pages 175~181
DOI : 10.9713/kcer.2014.52.2.175
Microbial fuel cells (MFC) were operated with livestock wastes and PEMFC (Proton Exchange Membrane Fuel Cells) MEA (Membrane and Electrode Assembly). OCV of MFC with mixtures of microbial was higher than that of MFC with single microbial. MFC using pig wastes showed highest OCV (540 mV) among cow waste, chicken waste and duck waste. And the power density of MFC using pig waste was
. Contamination of MEA with
ion and impurities was the one cause for low performance of MFC during operation.
Electrochemical Properties of Current Collector in the All-vanadium Redox Flow Battery
Hwang, Gan-Jin ; Oh, Yong-Hwan ; Ryu, Cheol-Hwi ; Choi, Ho-Sang ;
Korean Chemical Engineering Research, volume 52, issue 2, 2014, Pages 182~186
DOI : 10.9713/kcer.2014.52.2.182
Two commercial carbon plates were evaluated as a current collector (bipolar plate) in the all vanadium redox-flow battery (V-RFB). The performance properties of V-RFB were test in the current density of
. The electromotive forces (OCV at SOC 100%) of V-RFB using A and B current collector were 1.47 V and 1.54 V. The cell resistance of V-RFB using A current collector was
for charge and discharge, respectively. The cell resistance of V-RFB using B current collector was
for charge and discharge, respectively. The performance of V-RFB using each current collector was evaluated. The performance of V-RFB using A current collector was 93.1%, 76.8% and 71.4% for average current efficiency, average voltage efficiency and average energy efficiency, respectively. The performance of V-RFB using B current collector was 96.4%, 73.6% and 71.0% for average current efficiency, average voltage efficiency and average energy efficiency, respectively.
Simple synthesis of Biphosphonates with Excellent Flameproofing Properties
Cao, Yang ; Zhang, Weiwei ; Yang, Xufeng ; Yang, Jinfei ; Zhi, Huizhen ;
Korean Chemical Engineering Research, volume 52, issue 2, 2014, Pages 187~190
DOI : 10.9713/kcer.2014.52.2.187
Four excellent halogen-free biphosphonate flame retardants (EBDMP, EBDEP, MBDMP, MBDEP) were synthesized through polycondensation and Arbuzov rearrangement reactions without using any solvents. The products were characterized by ESI-MS, FT-IR and
NMR. The application of EBDEP in polyurethane soft foam was studied and the results illustrated its excellent flame-proofing properties.
Semi-pilot Scaled Hybrid Process Treatment of Malodorous Waste Air: Performance of Hybrid System Composed of Biofilter Packed with Media Inoculated with Thiobacillus sp. IW and Return-sludge and Photocatalytic Reactor
Lee, Eun Ju ; Lim, Kwang-Hee ;
Korean Chemical Engineering Research, volume 52, issue 2, 2014, Pages 191~198
DOI : 10.9713/kcer.2014.52.2.191
A semi-pilot hybrid system composed of a photocatalytic reactor and a biofilter was operated under various operating conditions in order to treat malodorous waste air containing both hydrogen sulfide and ammonia which are major air pollutants emitted from composting factories and many publicly owned treatment works (POTW). When both hydrogen sulfide and ammonia contained in malodorous waste air were treated simultaneously by a biofilter system, its performance of ammonia removal was much more poor than that by a biofilter system treating waste air containing only ammonia, unlike its performance of hydrogen sulfide removal. For semi-pilot hybrid system, the removal efficiencies of hydrogen sulfide and ammonia turned out to be ca. 83 and 65%, respectively. Therefore, for semi-pilot hybrid system, the removal efficiencies of hydrogen sulfide and ammonia was increased by ca. 4 and 30%, respectively, compared to those of semi-pilot biofilter system (control). In addition, the maximum elimination capacities of hydrogen sulfide and ammonia for semi-pilot hybrid system turned out to be ca. 60 and
, respectively. These maximum elimination capacities of hydrogen sulfide and ammonia were estimated to be ca. 9.1% and ca. 23.3% greater than those for semi-pilot biofilter system (control), respectively. Therefore, the semi-pilot hybrid system contributed the enhancement of removal efficiency and the maximum elimination capacity of ammonia in a higher degree than that of hydrogen sulfide, compared to the semi-pilot biofilter system.
Characteristics and Stability of Compositional Convection in Binary Solidification with a Constant Solidification Velocity
Hwang, In Gook ;
Korean Chemical Engineering Research, volume 52, issue 2, 2014, Pages 199~204
DOI : 10.9713/kcer.2014.52.2.199
In binary solidification compositional convection in a porous mushy layer influences the quality of the final products. We consider the mushy layer solidifying from below with a constant solidification velocity. The disturbance equations for the mushy layer are derived using linear stability theory. The basic-state temperature fields and the distribution of the porosity in the mushy layer are investigated numerically. When the superheat is large, the thickness of the mushy layer is relatively small compared to the thickness of the thermal boundary layer. With decreasing the superheat the critical Rayleigh number based on the thickness of the mushy layer increases and the mushy layer becomes stable to the compositional convection. The critical Rayleigh number obtained from the continuity conditions of temperature and heat flux at the mush-liquid interface is smaller than that from the isothermal condition at the upper boundary of the mushy layer.
Fabrication and Characterization of Conjugated Polymer Nanowires with Uniformed Size
Khim, Dongyoon ; Kim, Dong-Yu ; Noh, Yong-Young ;
Korean Chemical Engineering Research, volume 52, issue 2, 2014, Pages 205~208
DOI : 10.9713/kcer.2014.52.2.205
Here, we reported mass-produced organic nanowires with uniform sizes based on poly(9,9-dioctylflurorene) (PFO), poly(9,9-dioctylfluorene-co-benzothiadiazole) (F8BT), (regioregular poly(3-hexylthiophene) (P3HT) which are well known as organic semiconductors for opto/electronics applications, using a melt-assisted wetting method with anodic alumina membrane. The conjugated polymer nanowires showed uniformed diameters (D=250~300 nm) and lengths (
) with defect free smooth surface regardless of a kinds of semiconductors. In addition, the nanowires were uniformly deposited onto glass substrates by spray-coating method. Under the UV light irradiation, PFO and F8BT nanowires showed blue and yellow emissions, respectively.
Preparation of Al@Fe
Core-Shell Composites Using Amphiphilic Graft Copolymer Template
Patel, Rajkumar ; Kim, Sang Jin ; Kim, Jin Kyu ; Park, Jung Su ; Kim, Jong Hak ;
Korean Chemical Engineering Research, volume 52, issue 2, 2014, Pages 209~213
DOI : 10.9713/kcer.2014.52.2.209
A graft copolymer of poly(vinyl chloride)-g-poly(oxyethylene methacrylate) (PVC-g-POEM) was synthesized via atom transfer radical polymerization (ATRP) and used as a structure-directing agent to prepare
core-shell nanocomposites through a sol-gel process. The amphiphilic property of PVC-g-POEM allows for good dispersion of Al particles and leads to specific interaction with iron ethoxide, a precursor of
. Secondary bonding interaction in the sol-gel composites was characterized by Fourier transform-infrared (FT-IR) spectroscopy. The well-organized morphology of
core-shell nanocomposites was observed using scanning electron microscopy (SEM) and transmission electron microscopy (TEM). Energy dispersive X-ray (EDX) and X-ray diffraction (XRD) were used to analyze the elemental composition and crystallization structure of the composites.
Solvothermal Synthesis and Characterization of Cu
Tubular Membranes Using Surface Modified Supports
Noh, Seung-Jun ; Kim, Jinsoo ;
Korean Chemical Engineering Research, volume 52, issue 2, 2014, Pages 214~218
DOI : 10.9713/kcer.2014.52.2.214
In this study, nanoporous
membranes were synthesized on macroporous alumina tube supports by solvothermal method. It is very difficult to prepare uniform and crack-free
layer on macroporous alumina support by in situ solvothermal method. In this study, continuous and crack-free
tubular membranes could be obtained by in situ solvothermal process after surface modification of alumina support. The surface modification was conducted by spraying Cu precursor solution on the alumina support heated at
. The prepared
tubular membranes were characterized by XRD, FE-SEM and gas permeation experiments.
tubular membrane was calculated to be
by single gas permeation test, with the ideal selectivities of
Effect of Cosurfactant on Solubilization of Hydrocarbon Oils by Pluronic L64 Nonionic Surfactant Solution
Bae, MinJung ; Kim, DoWon ; Cho, Seo-Yeon ; Lim, JongChoo ;
Korean Chemical Engineering Research, volume 52, issue 2, 2014, Pages 219~225
DOI : 10.9713/kcer.2014.52.2.219
In this study, effect of cosurfactant on the solubilization rate of n-octane, n-decane and n-dodecane oil was performed by micellar solutions of polymeric nonionic surfactant Pluronic L64(
) at room temperature. It has been found that the solubilization rate of a hydrocarbon oil was enhanced with an increase in both chain length and amount of alcohol added. In case of addition of a short chain alcohol such as 1-butanol, the solubilization rate of a hydrocarbon oil was slightly increased since most of alcohol molecules remained in an aqueous surfactant solution. On the other hand, the addition of a relatively long chain alcohol such as 1-hexanol and 1-octanol produced a big increase in solubilization rate of a hydrocarbon oil mainly due to incorporation of alcohol molecules into micelles and thus producing more flexible micellar packing density. Dynamic interfacial tension measurements showed the same trend found in solubilization rate measurement. Both interfacial tension value at equilibrium and time required to reach equilibrium decreased with an increase in chain length of an alcohol.
Study on the Hydrolysis Kinetics of Xylan on Different Acid Catalysts
Na, Byeong-Il ; Lee, Jae-Won ;
Korean Chemical Engineering Research, volume 52, issue 2, 2014, Pages 226~232
DOI : 10.9713/kcer.2014.52.2.226
In this study, we investigated kinetic model for the acid-catalyzed xylan hydrolysis at temperature
. Also, we analyzed the kinetic parameters for xylose production and furfural decomposition. The hydrolysis of xylan and the degradation of xylose were promoted by high reaction temperature and acid concentration. The optimal hydrolysis condition for the highest reaction rate constants (
) was different depending on the acid catalysts. Among sulfuric, oxalic and maleic acid, the xylan reaction rate constants (
) to xylose had the highest value of
when 100 mM sulfuric acid was used at
. However, sulfuric acid induced more xylose degradation compared to oxalic and maleic acid hydrolysis. The activation energy for xylan degradation was the highest when sulfuric acid was used.
A Study on Ash Fusibility Temperature of Domestic Thermal Coal Implementing Thermo-Mechanical Analysis
Lee, Soon-Ho ; Lim, Ho ; Kim, Sang Do ; Jeon, Chung-Hwan ;
Korean Chemical Engineering Research, volume 52, issue 2, 2014, Pages 233~239
DOI : 10.9713/kcer.2014.52.2.233
The slagging which generated from ash deposition on furnace wall and tube in boiler reduces the heat transfer efficiency and damages to safety of boiler. The slag flow behavior in boiler is affected by melting temperature which is related to ash compositions. In this study, the behavior of slag is researched by using ash fusibility test, called TMA (Thermo-Mechanical Analysis). The technique measures the percentage shrinkage as the function of temperature, T25%, T50%, T75%, T90%. These temperatures indicate different stages of melting. Then, the effect of ash chemical compositions measured from XRF (X-ray Fluorescence Spectrometer) to ash fusion temperatures is discussed. Among the chemical compositions, refractory and fluxing influence on ash fusibility is described. High levels of refractory component and limited amount of fluxing components (
, CaO) increase overall melting temperatures. High
ratio decrease high melting temperatures (T75%, T90%). Meanwhile, the presence of reasonable levels of fluxing components reduces overall melting temperature. A presence of fluxing component such as
and CaO is found to decrease the T25% values significantly. From this research, it is possible to make a reasonable explanation and prediction of ash fusion characteristic from analysis of TMA results and ash chemical compositions.
Semi-pilot Scaled Biofilter Treatment of Malodorous Waste Air Containing Hydrogen Sulfide and Ammonia: 2. Performance of Biofilter Packed with Media Inoculated with a Consortium of Separated Microbes
Lim, Kwang-Hee ;
Korean Chemical Engineering Research, volume 52, issue 2, 2014, Pages 240~246
DOI : 10.9713/kcer.2014.52.2.240
A semi-pilot biofilter inoculated with the microbes consortium of Bacillus cereus DAH-1056 and Arthrobacter sp. KDE-0311 was operated under various operating conditions in order to treat malodorous waste air containing both hydrogen sulfide and ammonia. When both hydrogen sulfide and ammonia contained in malodorous waste air were treated simultaneously by semi-pilot biofilter inoculated with Thiobacillus sp. IW and return-sludge, the removal efficiencies of hydrogen sulfide and ammonia were ca. 80% and ca. 50%, respectively. On the other hand, in this study, the removal efficiencies of hydrogen sulfide and ammonia were ca. 90% and ca. 60%, respectively. Therefore, the removal efficiencies of hydrogen sulfide and ammonia were enhanced by ca. 13% and 20%, respectively, compared to the semipilot biofilter inoculated with Thiobacillus sp. IW and return-sludge. In addition, in this study, the maximum elimination capacities of hydrogen sulfide and ammonia were enhanced by ca. 15% (
) and 10~17% (
), respectively. In this study, it was observed either that in case of even a same inlet load of hydrogen sulfide, a higher concentration of hydrogen sulfide causes more difficulties in treating ammonia containing in waste air than a lower one, or that in case of even a same inlet load of ammonia, a lower concentration of ammonia results in higher removal efficienciy and elimination capacity than a higher one. Even though hydrogen sulfide and ammonia were treated simultaneously by a biofilter in this study, the maximum elimination capacity of hydrogen sulfide in this study exceeded or was similar to that in previous study of biofilter treating only hydrogen sulfide. In addition, this study showed the higher maximum elimination capacity of ammonia than other previous investigation of biofilter treating hydrogen sulfide and ammonia simultaneously.
Electrochemical Reduction of Carbon Dioxide Using Porous La
Kim, Jung Ryoel ; Lee, Hong Joo ; Park, Jung Hoon ;
Korean Chemical Engineering Research, volume 52, issue 2, 2014, Pages 247~255
DOI : 10.9713/kcer.2014.52.2.247
powder with the perovskite structure was prepared as electrode catalyst using citrate method. Porous electrode was made with as-prepared catalyst, carbon as supporter and polytetrafluoroethylene (PTFE) as hydrophobic binder. As results of potentiostatic electrolysis with potential of -1.5~-2.5 V vs. Ag/AgCl in 0.1, 0.5 and 1.0 M KOH at 5 and
on the porous electrode, liquid products were methanol, ethanol, 2-propanol and 1, 2-butanol regardless reaction temperature, while gas products were methane, ethane and ethylene at
, and methane, ethane and propane at
respectively. Optimal potentials for
reduction in the view of over all faradic efficiency were high values (-2.0 and -2.2 V) for gas products whereas low potential (-1.5 V) for liquid products regardless of concentration and temperature.
A Study on the Flame Resistance and Combustion Characteristics of MDF Plywood
Kim, In-Beom ;
Korean Chemical Engineering Research, volume 52, issue 2, 2014, Pages 256~260
DOI : 10.9713/kcer.2014.52.2.256
Interior of the building is used as a MDF plywood if there is a fire in order to delay the ignition, flame retardant paint, flame retardant solution and flame retardant film are being handled by the flame retardant. Combustion characteristics anf flame retardant performance results can be summarized as follows: General film with a sample showed that short of the criteria in terms of carbonation area, and the results of flame retardant paint, flame retardant solution and flame retardant film products satisfied the criteria. Toxic gases generated in the combustion process results in a film samples using a high incidence of carbon monoxide and the creation of a smoke could be seen. This confirm that is estimated that result from incomplete combustion of PVC film that attach, and displays high toxicity index and hazard class relatively.
Study on the Relationship between Aggregation Structure and Flow Rate Depending on Extrusion Temperature at Complex Mold of (Activated Carbon/Polymer Binder)
Lim, Yong Gyun ; Kim, Young Jun ; Park, Sang Jin ; Hong, Sung-Kyu ;
Korean Chemical Engineering Research, volume 52, issue 2, 2014, Pages 261~265
DOI : 10.9713/kcer.2014.52.2.261
As the need for miniaturization in water purification filter increases, the development of filter media for single filtration with multiple function was strongly required. In this study, the molded activated carbon composed of single unit was manufactured by extrusion-sintering process, and then the flow rate, density and porosity were investigated using the molded activated carbon manufactured at various extrusion temperature. We confirmed that it was possible to manufacture the single unit-molded activated carbon when the extrusion temperature was
being of polymer binder melting point, and the optimal extrusion temperature for the molded activated carbon with maximum flow rate was
since the molded activated carbon had low density and high through porosity. Also we confirmed that the flow rate through the molded activated carbon was strongly dependent upon through pore porosity compared to total porosity for the molded activated carbon.
Effects of Phenolic and Phosphite Antioxidants on the properties for PC/ABS Blends during High-Shear-Rate Processing
Lee, Han Ki ; Kim, Seon Hong ; Lee, Hyung Il ; Yoo, Jae Jung ; Yong, Da Kyoung ; Choi, Seok Jin ; Lee, Seung Goo ; Lee, Kee Yoon ;
Korean Chemical Engineering Research, volume 52, issue 2, 2014, Pages 266~271
DOI : 10.9713/kcer.2014.52.2.266
The effects of antioxidants on the properties of Polycarbonate/Acrylonitrile-Butadiene-Styrene(PC/ABS) blends were studied for the functions of the screw speed and loaded duration of high shear rate processing in order to investigate the degradation for PC/ABS blends. Tris-(2,4-di-tert-butyl-phenyl phosphate) (A1) and Bis(2,4-dicumylphenyl) pentaerythritol diphosphite (A3) as phosphite antioxidants and Octadecyl 3-(3,5-di-tert-butyl-4-hydroxyphenyl) propionate (A2) as a phenolic antioxidant are used. The thermal properties were detected by TGA and severely decreased, after the processing. The stress-induced and thermal degradation for PC/ABS blends with the antioxidant A3 was retarded better than the others. By using UTM, the mechanical properties also showed individually decreased according to the antioxidants, after the processing, especially, the elongations showed considerable decline behaviors, while the tensile strengths of PC/ABS blends changed very little. For example, in the operating conditions of 1000rpm of screw speed and 20 seconds of loaded period, the elongations decreased from 148% before the processing, to 91.6% with the A1, to 63% with the A2 and to 131% with the A3 after the processing, respectively. In order to get the morphological properties, the size distributions of the dispersed phases for PC/ABS were investigated by SEM analysis and tended to decrease, as the screw speed and loaded period of the processing increased. Therefore, we confirmed that the antioxidant A3 was the best of all of three to inhibit the stress-induced degradation of PC/ABS blends during the high shear rate processing.
Cross-flow Nanofiltration of PCB Etching Waste Solution Containing Copper Ion
Park, Hye-Ri ; Nam, Sang-Won ; Youm, Kyung-Ho ;
Korean Chemical Engineering Research, volume 52, issue 2, 2014, Pages 272~277
DOI : 10.9713/kcer.2014.52.2.272
In this study the nanofiltration (NF) membrane treatment of a sulfuric acid waste solutions containing copper ion (
) discharging from the etching processes of the printed circuit board (PCB) manufacturing industry has been studied for the recycling of acid etching solution. SelRO MPS-34 4040 NF membrane from Koch company was tested to obtain the basic NF data for recycling of etching solution and separation efficiency (total rejection) of copper ion. NF experiments were carried out with a cross-flow membrane filtration laboratory system. The permeate flux was decreased with the increasing copper ion concentration in sulfuric acid solution and lowering pH of acid solution, and its value was the range of
. Total rejection of copper ion was decreased with the increasing copper ion concentration, lowering pH of acid solution and decreasing cross-flow rate. The total rejection of copper ion was more than 70% at the experimental condition. The SelRO MPS-34 4040 NF membrane was represented the stable flux and rejection for 1 year operation.