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REFERENCE LINKING PLATFORM OF KOREA S&T JOURNALS
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Korean Chemical Engineering Research
Journal Basic Information
Journal DOI :
The Korean Institute of Chemical Engineers
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Volume & Issues
Volume 54, Issue 4 - Aug 2016
Volume 54, Issue 3 - Jun 2016
Volume 54, Issue 2 - Apr 2016
Volume 54, Issue 1 - Feb 2016
Selecting the target year
3D Bioprinting Technology in Biochemical Engineering
Eom, Tae Yoon ;
Korean Chemical Engineering Research, volume 54, issue 3, 2016, Pages 285~292
DOI : 10.9713/kcer.2016.54.3.285
Three-dimensional (3D) printing is driving major innovation in various areas including engineering, manufacturing, art, education and biosciences such as biochemical engineering, tissue engineering and regenerative medicine. Recent advances have enabled 3D printing of biocompatible materials, cells and supporting components into complex 3D functional tissues. Compared with non-biological printing, 3D bioprinting involves additional complexities which require the integration of technologies from the fields of biochemical engineering, biomaterial sciences, cell biology, physics, pharmaceutics and medical science.
Electrochemical Properties of Activated Carbon Supercapacitors Adopting Hydrophilic Silica and Hydrogel Electrolytes
Lee, Hae Soo ; Park, Jang Woo ; Lee, Yong Min ; Ryou, Myung Hyun ; Kim, Kwang Man ; Ko, Jang Myoun ;
Korean Chemical Engineering Research, volume 54, issue 3, 2016, Pages 293~298
DOI : 10.9713/kcer.2016.54.3.293
A hydrogel electrolyte consisting of 6 M KOH aqueous solution, potassium polyacrylate (PAAK, 3 wt.%), and a hydrophilic silica OX50 (1 wt.%) was prepared to use as an electrolyte medium coated on a Scimat separator of activated carbon supercapacitor. The silica particle distributed homogeneously on surface pores of the separator to increase ionic conductivity and electrochemical stability of the hydrogel electrolyte. The silica addition also involved superior specific capacitance even at higher scan rates due to decrease in interfacial resistance between hydrogel electrolyte and activated carbon electrode.
Synthesis Characteristics of ZnO Powder from Precursors Composed of Nitrate-Citrate Compounds
Yang, Si Woo ; Lee, Seung Ho ; Lim, Dae Ho ; Yoo, Dong Jun ; Kang, Yong ;
Korean Chemical Engineering Research, volume 54, issue 3, 2016, Pages 299~304
DOI : 10.9713/kcer.2016.54.3.299
Characteristics of self-propagating reaction for the preparation of ZnO powder from precursors composed of nitrate and citrate compounds were examined. The ratio of C/N was maintained in range of 0.7~0.8 to initiate the self-propagating reaction between the reducing citrate and oxidizing nitrate groups. The samples were decomposed thermally by using TGA. The sudden decomposition occurred in the range of X > 0.5 in a very short time with a very sharp decrease of mass, indicating that the self-propagating reaction would occur. Friedman, Ozawa-Flynn-Wall and Vyazovkin methods were employed to predict the activation energy, reaction order and frequency factor of the reaction rate in the rate determining step of X < 0.5 range. The activation energy increased with increasing fractional conversion in the range of 46~130 (kJ/min). The reaction order decreased in the range of 2.9~0.9, while the frequency factor increased in the range of 85~278 (
), respectively, with increasing the rate of temperature increase.
Study on the Degradation of MEA Using Sulfonated Poly(ether ether ketone) Membrane in Proton Exchange Membrane Fuel Cells
Lee, Hye-Ri ; Lee, Se-Hoon ; Hwang, Byung-Chan ; Na, Il-Chai ; Lee, Jung-Hun ; Oh, Sung-June ; Park, Kwon-Pil ;
Korean Chemical Engineering Research, volume 54, issue 3, 2016, Pages 305~309
DOI : 10.9713/kcer.2016.54.3.305
Recently, there are many efforts focused on development of more economical non-fluorinated membranes for PEMFCs (Proton Exchange Membrane Fuel Cells). In this study, to test the durability of sPEEK MEA (Membrane and Electrode Assembly), ADT (Accelerated Degradation Test) of MEA degradation was done at the condition that membrane and electrode were degraded simultaneously. Before and after degradation, I-V polarization curve, hydrogen crossover, electrochemical surface area, membrane resistance and charge transfer resistance were measured. Although the permeability of hydrogen through sPEEK membrane was low, sPEEK membrane was weaker to radical evolved at low humidity and OCV condition than fluorinated membrane such as Nafion. Performance after MEA degradation for 144 hours and 271 hours were reduced by 15% and 65%, respectively. It was showed that the main cause of rapid decrease of performance after 144 hours was shorting due to Pt/C particles in the pinholes.
Optimization of Hot-water Extraction Conditions of Polyphenolic Compounds from Lipid Extracted Microalgae
Choi, Kanghoon ; Lee, Jihyun ; Jo, Jaemin ; Shin, Seulgi ; Kim, JinWoo ;
Korean Chemical Engineering Research, volume 54, issue 3, 2016, Pages 310~314
DOI : 10.9713/kcer.2016.54.3.310
The search for natural antioxidants as alternatives to synthetic products is growing. Microalgae have emerged as a source of natural antioxidants with significant and diverse health-promoting properties. In this study, the effects of hot-water extraction conditions on total polyphenol compounds (TPC) production were investigated for lipid extracted microalgae (LEA). In order to enhance the polyphenol productivity, the extraction variables including solvents, temperature, time and ethanol concentration were optimized. The results showed hot-water extraction provided a higher extraction efficiency than the organic solvents and extraction at high temperatures showed a better extraction efficiency. While hot-water extract showed a higher extraction efficiency compared to 98% ethanol extraction, the mixture of water and ethanol (40:60 v/v) showed the highest production of polyphenols. The maximum polyphenols of 3.35 mg GAE (gallic acid equivalent)/g DM were obtained at the optimized extraction time of 10 min,
and 40% ethanol, respectively. Although Tetraselmis KCTC 12236BP was preprocessed by hexane to remove lipid for bio-diesel production, the results showed LEA contains relatively high level of polyphenols compared to untreated microalgae which can be used in the production of value-added materials. The predictions obtained from the developed Peleg's model were compared with the experimental data under the same operating conditions. The predicted and experimental data were consistent, indicating the reliability of the model.
Optimization of Extraction Conditions of Polyphenolic Compounds from Amaranth Leaf using Statistically-based Optimization
Jo, Jaemin ; Choi, Kanghoon ; Shin, Seulgi ; Lee, Jihyun ; Kim, JinWoo ;
Korean Chemical Engineering Research, volume 54, issue 3, 2016, Pages 315~319
DOI : 10.9713/kcer.2016.54.3.315
This study examined the optimization of hot-water extraction conditions for maximizing the total polyphenol compounds (TPC) extracted from amaranth leaf. The effects of three independent variables, including extraction temperature, extraction time and ethanol concentration on TPC were investigated using central composite design (CCD). The concentration of TPC increased with increased levels of extraction temperature and time. The extraction temperature and the ethanol concentration showed the significant effect on TPC production (p<0.05). The predicted values at the optimized condition were acceptable when compared to the experimental values (
). The optimum extraction conditions were as follows: temperature of
, time of 50 min and ethanol concentration of 61.6% (v/v) for the maximum TPC of 12.6 mg GAE/g DM.
Techno-economic Comparison of Absorption and Adsorption Processes for Carbon Monoxide (CO) Separation from Linze-Donawitz Gas (LDG)
Lim, Young-Il ; Choi, Jinsoon ; Moon, Hung-Man ; Kim, Gook-Hee ;
Korean Chemical Engineering Research, volume 54, issue 3, 2016, Pages 320~331
DOI : 10.9713/kcer.2016.54.3.320
Linze-Donawitz gas (LDG) adjunctively produced in the steel mill contains over 60% of CO. Two processes that recover high purity CO from LDG were considered: COSORB and CO-Pressure swing adsorption (PSA). This study aimed to decide which one is more economically feasible than the other by techno-economic analysis (TEA). From the technical point of view of TEA, the process flow diagram (PFD) was constructed, the mass and energy balances were calculated, and the equipment type and size were determined in order to estimate the total capital investment (TCI) and the total production cost (TPC). From the economic point of view of TEA, economic performance such as return on investment (ROI) and payback period (PBP) was evaluated, and the sensitivity analysis was carried out to identify key factors influencing ROI and PBP. It was found that CO-PSA is more economically feasible due to higher ROI and lower PBP. The CO price highly influenced ROI and PBP.
The Evaluation of Korea's Competitiveness in Lubricants Industries Using Patent Index Analysis
Kim, Chanjung ; Kwon, Sunghoon ; Kim, Jiyong ;
Korean Chemical Engineering Research, volume 54, issue 3, 2016, Pages 332~339
DOI : 10.9713/kcer.2016.54.3.332
We evaluate the technical competitiveness of Korea in lubricating oil industries by comparatively analyzing the patent activities. In achieving the goal, we collect and statistically analyze the historical patent data of lubricants production technologies. We here consider nine technology groups classified by their raw material types and process features of four countries such as USA, Japan, EU and Korea. We then evaluate Korea's competitiveness in lubricating oil industries using different patent index including patent family size, cites per patent, patent impact index and technology strength. Based on the evaluation results, we finally propose the practical strategies to improve Korea's competitiveness in lubricants industries.
Modeling and Optimization of High Strength Wastewater Treatment Using the Electro Oxidation Process
Lee, Hongmin ; Lee, Sangsun ; Hwang, Sungwon ; Jin, Dongbok ;
Korean Chemical Engineering Research, volume 54, issue 3, 2016, Pages 340~349
DOI : 10.9713/kcer.2016.54.3.340
Electro oxidation system was designed in this study for the reduction of COD (Chemical Oxygen Demand) from high-strength wastewater, produced during refinery turnaround period. First, BDD (Boron Doped Diamond) electrode was synthesized and electro oxidation system of actual industrial wastewater was developed by adopting the synthesized BDD electrode. The experiments were carried out under various operating conditions under certain range of current density, pH, electrolyte concentration and reaction time. Secondly, reaction kinetics were identified based on the experimental results, and the kinetics were embedded into a genetic mathematical model of the electro oxidation system. Lastly, design and operating parameters of the process were optimized to maximize the efficiency of the pretreatment system. The coefficient of determination (
) of the model was found to be 0.982, and it proved high accuracy of the model compared with experimental results.
Dynamic Modeling & Analysis of Vapor Phase Blowdown of Depressurized Vessel
Kim, Kyungwoon ; Seo, Ji Won ; Hwang, Sungwon ; Lee, Yun Ju ; Moon, Young Sik ;
Korean Chemical Engineering Research, volume 54, issue 3, 2016, Pages 350~359
DOI : 10.9713/kcer.2016.54.3.350
For accurate estimation over the change of pressure and temperature of the vessel during blowdown period, a new dynamic blowdown model was developed in this work. In particular, heat transfer from the vessel wall to discharge gas at both laminar or turbulent flow in the vessel was embedded to the model to increase the accuracy of blowdown estimation. For thermodynamics, the whole blowdown period was discretized into finite pressure decrement steps, and the step size was adjusted so that the calculation can be more efficiently carried out, while maintaining the model's accuracy. Both Peng-Robinson and Soave-Redlich-Kwong equation of states were applied to the model, and the results were compared each other. Finally, the simulation results was compared with Haque and coworkers' experimental results, and it proved high accuracy of the model.
Consequence Analysis and Risk Reduction Methods for Propulsion Test Facility
Shin, Ahn-Tae ; Byun, Hun-Soo ;
Korean Chemical Engineering Research, volume 54, issue 3, 2016, Pages 360~366
DOI : 10.9713/kcer.2016.54.3.360
The Propulsion Test Facilities for the development of Korea Space Launch Vehicle-II are being built, some test facilities are completed and various combustion tests are running. The Propulsion Test Facilities consists test-stand, which carries out tests for engine development model, and various sub-systems and vessels containing LOX and Jet A-1 as propellant. There are always risks of fire and explosion at the test-stand since engine development model is conducted at test-stand with real combustion test with very high pressure, mixed propellant and high energy. In this paper, in order to establish the consequence analysis and risk reduction measures in the Propulsion Test Facilities, followings are considered. 1) a propellant leak accident scenario is assumed in test-stand. 2) TNT equivalent model equation based on blast wave of the explosion was used to analyze blast overpressure and impacts. Also, technical, systematic and managemental measure is described to ensure risk reduction for propulsion test facility.
Explosion Characteristics and Flame Velocity of Suspended Plastic Powders
Han, Ou Sup ; Lee, Keun Won ;
Korean Chemical Engineering Research, volume 54, issue 3, 2016, Pages 367~373
DOI : 10.9713/kcer.2016.54.3.367
Many of plastic powders handled in industry are combustible and have the hazard of dust fire and explosion accidents. However poor information about the safe handling has been presented in the production works. The aim of this research is investigated experimentally on explosive characteristics of various plastic powders used in industry and to provide additional data with safety informations. The explosibility parameters investigated using standard dust explosibility test equipment of Siwek 20-L explosion chamber. As the results, the dust explosion index (
) of ABS (
), PE (
), PBT (
), MBS (
) and PMMA (
) are 62.4, 59.4, 70.3, 303 and 203.6[
], respectively. And flame propagation velocity during plastic dust explosions for prediction of explosive damage was estimated using a flame propagation model based on the time to peak pressure and flame arrival time in dust explosion pressure assuming the constant burning velocity.
Method for Drying of Crude Extract Obtained by Biomass Extraction Using an Ionic Liquid
Kim, Seul Ki ; Kim, Jin-Hyun ;
Korean Chemical Engineering Research, volume 54, issue 3, 2016, Pages 374~379
DOI : 10.9713/kcer.2016.54.3.374
When using an ionic liquid as co-solvent, the extraction efficiency of anticancer agent paclitaxel from biomass was dramatically improved. However, the residual ionic liquid had a significant negative effect on convenient and feasibility of following concentration and drying steps. In this study, a novel method was developed for the effective drying of the crude extract obtained from biomass extraction with ionic liquid. The residual ionic liquid was easily and conveniently removed by drying alone after pre-treatment and additional washing of a sample with water. The optimal crude extract/water ratio and mixing time for pre-treatment and crude extract/water ratio for additional washing were 1:70 (w/v), 4 min, and 1:100 (w/v), respectively. In the microwave-assisted drying process, the drying time was 9-fold shorter than in the vacuum oven drying process.
Paper-Based Neuraminidase Assay Sensor for Detection of Influenza Viruses
Hwang, Cheol-hwan ; Jeong, Seong-Geun ; Park, Han-Kyu ; Lee, Chang-Soo ; Kim, Yun-Gon ;
Korean Chemical Engineering Research, volume 54, issue 3, 2016, Pages 380~386
DOI : 10.9713/kcer.2016.54.3.380
In this study, we described a paper-based neuraminidase assay sensor (PNAS) which can be applied to detect the infection by influenza viruses. The PNAS was designed and manufactured to quantitatively identify the levels of neuraminidase in the sample, which is based on colorimetric analysis using the X-Neu5Ac substrate. The limit of detection of the PNAS was determined as 0.004 U/mL of neuraminidase. According to the amount of neuraminidase in human serum, the PNAS could monitor the enzyme activity with a good linearity (
> 0.99). In addition, the initial performance of the PNAS has been maintained up to 70 days in the
. Finally, we demonstrated whether the Michaelis-Menten kinetics is applied to the PNAS, which can show the reliability of the enzyme reactions. The kinetic studies indicated that the PNAS provides the good condition for enzyme reactions (
), but they were performed on paper chip nonetheless. The paper-based neuraminidase assay sensor may be useful in a wide range of rapid and safe detection of influenza virus.
Preparation of Water Repellent Polyurethane Coating Films Using Perfluoroalkyl Alcohol
Kim, Nam Woo ; Ahn, Chi Young ; Song, Ki Chang ;
Korean Chemical Engineering Research, volume 54, issue 3, 2016, Pages 387~393
DOI : 10.9713/kcer.2016.54.3.387
Fluorinated polyurethane coating solutions were synthesized from perfluoroalkyl alcohol, toluene diisocyanate, and polycarbonate diol as starting materials. Next, coating films were prepared by spin-coating the fluorinated polyurethane coating solutions on the PC substrates, followed by thermal curing at
. The obtained fluorinated polyurethane coating films were characterized by FT-IR spectroscopy, UV-Vis spectrometer, contact angle tester and pencil hardness tester. Contact angle measurements of water on the coating films showed that the addition of perfluoroalkyl alcohol improved the water repellency and increased the contact angle from
. However, the pencil hardness of coating films exhibited a constant grade of H, irrespective of the addition of perfluoroalkyl alcohol.
The Effect of addition of CuO to Fe
Oxygen Carrier for Hydrogen Production by Chemical Looping
Lee, Jun Kyu ; Kim, Cho Gyun ; Bae, Ki Kwang ; Park, Chu Sik ; Kang, Kyoung Soo ; Jeong, Seong Uk ; Kim, Young Ho ; Joo, Jong Hoon ; Cho, Won Chul ;
Korean Chemical Engineering Research, volume 54, issue 3, 2016, Pages 394~403
DOI : 10.9713/kcer.2016.54.3.394
production by chemical looping is an efficient method to convert hydrocarbon fuel into hydrogen with the simultaneous capture of concentrated
. This process involves the use of an iron based oxygen carrier that transfers pure oxygen from oxidizing gases to fuels by alternating reduction and oxidation (redox) reactions. The enhanced reactivities of copper oxide doped iron-based oxygen carrier were reported, however, the fundamental understandings on the interaction between
and CuO are still lacking. In this study, we studied the effect of dopant of CuO to
particle on the morphological changes and the associated reactivity using various methods such as SEM/EDX, XRD, BET, TPR, XPS, and TGA. It was found that copper oxide acted as a chemical promoter that change chemical environment in the iron based oxygen carrier as well as a structural promoter which inhibit the agglomeration. The enhanced reduction reactivity was mainly ascribed to the increase in concentration of
on the surface, resulting in formation of charge imbalance and oxygen vacancies. The CuO doped
particle also showed the improved reactivity in the steam oxidation compared to
particle probably due to acting as a structural promoter inhibiting the agglomeration of iron species.
Thermal Characteristics of LaMnO
Non-isothermal Synthesis Reaction
Jeon, Jong Seol ; Lee, Jung Hun ; Yoon, Chang Hyeok ; Yoo, Dong Jun ; Lim, Dae Ho ; Kang, Yong ;
Korean Chemical Engineering Research, volume 54, issue 3, 2016, Pages 404~409
DOI : 10.9713/kcer.2016.54.3.404
Thermal Characteristics and kinetic parameters of
synthesis reaction were investigated by means of TGA (Thermogravimetric analysis) at non-isothermal heating conditions (5.0, 10.0, 15.0 and 20.0 K/min). The reaction was occurred rapidly at 450~600K (X=0.4~0.7) depending on the heating rate. Activation energy for the synthesis of
from the precursor, which was determined by different method such as Friedman, Ozawa-Flynn-Wall and Vyazovkin methods, was in the range of 23~243 kJ/g-mol depending on the fractional conversion level and estimation method. The reaction order decreased with increasing heating rate and fractional conversional level. The average reaction order was 4.50 in case of X=0.1~0.3, while it was 1.87 in case of X=0.7~0.9, respectively. The value of frequency factor of reaction rate increased with inceasing heating rate and fractional conversion level. The aveage value of frequency factor was 205.6 (
) when X=0.1~0.3, while it was 475.2 (
) when X=0.7~0.9, respectively.
Preparation of Electrically Conductive Composites Filled with Nickel Powder and MWCNT Fillers
Kim, Sunghoon ; Park, Seonghwan ; Kwon, Jaebeom ; Ha, KiRyong ;
Korean Chemical Engineering Research, volume 54, issue 3, 2016, Pages 410~418
DOI : 10.9713/kcer.2016.54.3.410
In this study, we prepared electrically conducting composites using epoxy resin of diglycidyl ether of bisphenol A (DGEBA) as a matrix, triethylenetetramine (TETA) as a hardener and nickel powder or multi-walled carbon nanotubes (MWCNTs) grafted with
) as electrically conducting fillers. Electrical conductivity of composite films were measured by coating on the slide glass with a doctor blade. We measured modification reactions of MWCNT and reaction of MWCNT-
with DGEBA epoxy resin by fourier transform infrared spectrometer (FTIR), thermogravimetric analyzer (TGA) and elemental analyzer (EA). Morphology of composites was investigated by scanning electron microscope (SEM) and sheet resistances of composites were measured by 4-point probe. We found
of sheet resistance for epoxy composite containing both 40 wt% nickel powder and 0.5 wt% of MWCNT-
as fillers, equivalent to epoxy composite containing 53.3 wt% nickel powder only as a filler.
Benzyl Alcohol Oxidation over H
Catalyst Chemically Immobilized on Sulfur-containing Mesoporous Carbon
Gim, Min Yeong ; Kang, Tae Hun ; Choi, Jung Ho ; Song, In Kyu ;
Korean Chemical Engineering Research, volume 54, issue 3, 2016, Pages 419~424
DOI : 10.9713/kcer.2016.54.3.419
) catalyst chemically immobilized on sulfur-containing mesoporous carbon (S-MC) was prepared, and it was applied to the benzyl alcohol oxidation reaction. S-MC was synthesized by a templating method using SBA-15 and p-toluenesulfonic acid as a templating agent and a carbon precursor, respectively. S-MC was then modified to have a positive charge, and thus, to provide sites for the immobilization of
. By taking advantage of the overall negative charge of
catalyst was immobilized on the S-MC support as a charge matching component. It was revealed that
species were finely and molecularly dispersed on the S-MC via chemical immobilization. In the vapor-phase oxidation of benzyl alcohol,
/S-MC catalyst showed higher conversion of benzyl alcohol and higher yield for benzaldehyde and benzoic acid than unsupported
catalyst. The enhanced catalytic performance of
/S-MC was due to fine dispersion of
species on the S-MC via chemical immobilization.
A Study on the Synthesis of p-phenylenediamine (PPD) Using Copper Catalyst
Kim, Jungsuk ; Lee, Sang-yong ; Lee, Jungho ; Choi, Won Choon ; Kang, Na Young ; Park, Sunyoung ; Kim, Kiwoong ; Lim, Jong Sung ; Park, Yong-Ki ; Seo, Hwimin ;
Korean Chemical Engineering Research, volume 54, issue 3, 2016, Pages 425~430
DOI : 10.9713/kcer.2016.54.3.425
p-Phenylenediamine (PPD) was synthesized by aromatic amination of p-diiodobenzene (PDIB) using liquid ammonia and Cu-catalysts. The effects of the catalyst, reductant, ammonia quantity and reaction temperature on PPD production were investigated. Cu(I) compounds and Cu powder were selected as catalyst due to a higher selectivity than Cu(II) compounds. As the catalyst quantity increased, rate of PPD production as well as side reaction of aniline decreased with increasing the quantity of ammonia. Reductants such as ascorbic acid, hydrazine and dihydroxyfumaric acid were tested to lower the catalyst loading. The use of reductants resulted in increasing the reaction rate but also increased the amount of aniline The rate of reaction using ascorbic acid or dihydroxyfumaric acid was faster than that using hydrazine. The lowest side reaction of aniline was found in dihydroxyfumaric acid of reductants investigated.
Effect of Gamma Irradiation on Wood Chip Saccharification Pretreated with NaOH
Kim, Su-mi ; Choi, Jong-il ; Joe, Min-Ho ; Kim, Jong-deog ;
Korean Chemical Engineering Research, volume 54, issue 3, 2016, Pages 431~435
DOI : 10.9713/kcer.2016.54.3.431
The aim of this study was to investigate the effect of gamma irradiation on the pretreatment of wood chips with NaOH solution. The degree of saccharification was quantified by measuring reducing sugar and glucose concentrations after enzymatic hydrolysis. After pretreatment with 10 g/L NaOH, the wood chips were irradiated at the doses of 0, 50, 100, and 200 kGy, respectively. Among the irradiated samples, wood chips irradiated at the dose of 200 kGy had the highest reducing sugar concentration of 12.2 g/L. Also, to define the effect of irradiation before pretreatment, the wood chips were first gamma-irradiated and then pretreated with NaOH. When the NaOH treatment was conducted after irradiation at 200 kGy, the reducing sugar content was further increased to 13.4 g/L and glucose content of the wood chip was as high as 7.9 g/L. These results suggest that gamma irradiation may be the promising method for pretreatment of cellulose biomass.