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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
Separation Techniques Using Ionic Liquids
Cho, Min-Ho ; Lee, Hyun-Joo ; Kim, Hong-Gon ;
Korean Chemical Engineering Research, volume 48, issue 1, 2010, Pages 1~9
Since carbon dioxide,
, was revealed as a major greenhouse gas, techniques for its separation, capture, and storage have received increasing interest in recent years. Aqueous amines are the most widely accepted
absorbents, but they cause the problems such as high regeneration energy, thermal degradation, and loss of absorbents due to their volatility. Ionic liquids having high thermal stability, extremely low vapor pressure, and capability of selectively absorbing specific gases have been proposed as new
capturing solvents which may potentially replace aqueous amines. By reviewing the ionic liquids having capability to absorb
reported in previous papers, we seek to develop a comprehensive understanding on the factors that influence the
solubility in ionic liquids such as their structures, absorption temperature, pressure, water content, etc., and to estimate the potential of ionic liquids as
Recent Developments and Challenging issues of Solid Catalysts for Biodiesel Production
Lee, Jin-Suk ; Park, Soon-Chul ;
Korean Chemical Engineering Research, volume 48, issue 1, 2010, Pages 10~15
Intensive works have been carried out to develop more efficient solid catalysts for biodiesel production from various feedstocks including refined oils and waste fats. Among many catalysts, metal oxides and ion exchange resins are the most intensively studied ones. With regard to metal oxide catalysts, major research activities have focused on the identification of the active compounds and their immobilizing methods on the supports. As metal oxide catalysts have strong thermal stability, they may be used in simultaneous transesterification and esterification of waste fats. However, ion exchange resin catalysts were mainly applied in the esterification of the free fatty acids in waste fats because of their lower thermal stability. For both solid catalysts, further works are needed to make them to be used in commercial process. Especially fast deactivation of the solid catalyst would be the most challenging problem.
Devolatilization 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 1, 2010, Pages 16~19
Devolatilization characteristics of municipal wood waste were measured by using an isothermal thermogravimetric analyzer(TGA) and discussed. Volatile matter was mainly released at temperatures between
. The volatile content increased with an increase of temperature but levelled off at temperatures
. The rate of devolatilization could be expressed by a shrinking particle model which was ruled by the reaction rate. The activation energy ranged from 13.1 to 18.5 kJ/g mol.
Chemical Characteristics of Water Soluble Components in Fine Particulate Matter at a Gwangju area
Park, Seung-Shik ; Cho, Sung-Yong ; Kim, Seung-Jai ;
Korean Chemical Engineering Research, volume 48, issue 1, 2010, Pages 20~26
Water soluble organic and inorganic species are important components in atmospheric aerosol particles and may act as cloud condensation nuclei to indirectly affect the climate. To characterize organic and elemental carbon(OC and EC), water-soluble organic carbon(WSOC) and inorganic ionic species contents, daily
measurements were made during the wintertime at an urban site of Gwangju. Average concentrations of WSOC,
, which are major components in the water-soluble fraction in
, are 2.11, 5.73, 3.51 and 3.31
, respectively, representing 12.0(2.9~23.9%), 21.0(12.9~37.6%), 11.6(2.5~25.9%) and 11.7%(3.8~18.6%) of the
, respectively. Abundance of water soluble organic compounds ranged from 5.4 to 35.9% of total water soluble organic and inorganic components with a mean of 17.6%. Even though the sampling was performed during the winter, the average contributions of secondary OC and WSOC, as deduced from primary OC/EC(or WSOC/EC) ratio, were relatively high, accounting for 17.9%(0~44.4%) of the total OC and 11.2%(0.0~51.4%) of the total WSOC, respectively. During the sampling period, low
) ratio of 0.14(0.03~0.32) and relative humidity condition in the winter time suggest an possibility of impact of long-range transport and/or aqueous transformation processes such as metal catalyzed oxidation of sulfur, in-cloud processes, etc.
Properties of Fucoidan as Raw Materials of Water-holding Cream and Cosmetics
Cha, Sung-Hwan ; Lee, Jung-Shik ; Kim, Young-Suk ; Kim, Dong-Uk ; Moon, Jae-Cheon ; Park, Kwon-Pil ;
Korean Chemical Engineering Research, volume 48, issue 1, 2010, Pages 27~32
Properties of fucoidan used for functional cosmetics agents were studied. Fucoidan was extracted from Undaria pinnatifida sporophylls. To test possibility of fucoidan as a cosmetics material, water-holding property measurement, DPPH free radical scavenging assay and MTT assay were done. Water-holding property of fucoidan was higher than that of hyaruronic acid, which is known as the one of the best water-holding material. The water-holding strength of fucoidan slightly increase as molecular weight of fucoidan decrease. Fucoidan showed high stability from MTT assay and good anti-oxidation property from DPPH assay. To evaluate the effect of water-holding property and anti-alergy property of fucoidan on the atopic dermatitis(AD), 46 AD patients were treated with fucoidan cream. After 6 weeks treatment, Investigation Global Assessment(IGA) scores decreased from 3.04 to 2.15, that is fucoidan cream had a 39.8% benefit effect on atopic dermatitis.
Microfluidic System for the Measurement of Cupric Ion Concentration using Bilayer Lipid Membrane on Silver Surface
Jeong, Beum-Seung ; Kim, Do-Hyun ;
Korean Chemical Engineering Research, volume 48, issue 1, 2010, Pages 33~38
A microfluidic system has been developed using biomaterial for the measurement of cupric ion concentration. The cell-membrane-mimicking bilayer lipid membrane(BLM)-coated silver electrode was used for the sensing of cupric ion concentration. The silver-supported BLM could increase its stability. A silver-supported bilayer lipid membrane(s-BLM) was easily obtained using its self-assembling characteristics by immersing silver wire into lipid(phosphatidylcholine; PC) solution and then dipping into aqueous KCl solution. These s-BLMs were used to determine the relationship between
concentration and current crossing s-BLM. Their relationship showed high linearity and reproducibility. The calibration curve was constructed to express the relationship between
concentration and current in the
concentration range of 10 and 130
. This calibration curve was used to measure
concentration in an unknown sample. Microfluidic system with s-BLM was made of PDMS(polydimethyl siloxane) using typical soft photolithography and molding technique. This integrated system has various functions such as activation of the silver surface without cutting silver wire, coating of BLM on silver surface, injection of KCl buffer solution, injection of
sample and measurement of
concentration in the sample.
Evaluation of Economic Feasibility of Power Generation System using Waste Woody Biomass in a CFBC Plant
Kim, Sung-June ; Nam, Kyung-Soo ; Lee, Jae-Sup ; Seo, Seong-Seok ; Lee, Kyeong-Ho ; Yoo, Kyung-Seun ;
Korean Chemical Engineering Research, volume 48, issue 1, 2010, Pages 39~44
Economic feasibility of power generation system using waste woody biomass in a circulating fluidized bed combustor has been investigated. Effects of important variables such as capital investment, cost of waste wood, certified emission reduction(CER), system marginal price(SMP) on the benefit of business have been analyzed. Internal rate of return(IRR) was predicted as 16.67%, which implicates the business is promising based on the assumptions such as SMP of 99Won/kWh, capital cost of 10.65 billion won, and complimentary providing of waste wood. Major factors affecting the benefit of business were as follows; system marginal price, operational rate, capital investment, expenditure of waste wood, certified emission reduction. In addition, it must be necessary to consider CHP power plant providing steam as one of the means to diversify sales network, for the management of the business risk.
Preparation of crosslinkable imide oligomers and Applications in Polyether Imides for Dual-ovenable Packaging
Seo, Jong-Chul ; Park, Su-Il ; Choi, Seung-Hyuk ; Jang, Wong-Bong ; Han, Hak-Soo ;
Korean Chemical Engineering Research, volume 48, issue 1, 2010, Pages 45~52
Two different imide oligomers(6FDA-ODA/APA and 6FDA-MDA/MA) having crosslinkable end groups were prepared by using a solution imidization method and their properties were investigated. Also, semi-interpenetrating polymer networks(semi-IPN) were prepared using the blends of imide oligomers with polyetherimide Ultem
, which is used in dual-ovenable packaging materials. The characteristic properties of semi-IPN films were interpreted by using TGA, Thin Film Diffusion Analyzer, and WAXD. Molecular weights of imide oligomers were successfully controlled utilizing 2-aminophenylacetylene(APA) and maleic anhydride(MA) as an endcapping agent. Exotherm reactions by crosslinking appeared and the amount of exthotherm heat was linearly increased as the content of imide oligomers was increased. For semi-IPNs of Ultem
and imide oligomers, 5% and 10% weight loss temperatures increased as the contents of imide oligomers were increased. Diffusion coefficient and water uptake of semi-IPNs decreased as the content of imide oligomers was increased, which might be resulted from hydrophobic fluorine group and high packing density. It was concluded that relatively low thermal stability and hydrolytic stability of polyetherimide Ultem
were improved by incorporating new developed imide oligomers.
Effects of Annealing Process on the Crystallinity and Tensile Strength of PTFE
Kim, Jung-Teag ; Kim, Eun-Bong ; Kim, Si-Young ; Ju, Chang-Sik ;
Korean Chemical Engineering Research, volume 48, issue 1, 2010, Pages 53~57
In this work, we made experimental studies on the annealing process of PTFE(polytetrafluoroethylene) at
and examined the effects on crystallinity and tensile strength of PTFE. The experiments were performed at air atmosphere and the processes progressed up to 8 hours. From measuring tensile strength and SEM(scanning electron microscopy) observation, we could know PTFE was anisotropic material due to the band structure. Crystallinity of raw and annealed PTFE was measured by DSC(differential scanning calorimetry). As a result, crystallinity of annealed PTFE decreased and tensile strength increased. Also, we could verify the relation between crystallinity and tensile strength of annealed PTFE was linear. Raw PTFE, however, dropped out from the linear relation. Finally, PTFE annealed at
for 6 hours showed the smallest crystallinity and the largest tensile strength.
Study on the Combustion Characteristics of Wood-pellet and Korean Anthracite Using TGA
Kim, Dong-Won ; Lee, Jong-Min ; Kim, Jae-Sung ; Seon, Pyeong-Ki ;
Korean Chemical Engineering Research, volume 48, issue 1, 2010, Pages 58~67
Combustion of the Korean Anthracite and wood-pellet was characterized in air atmosphere with variation of heating rate(5, 10, 20 and
/min) in TGA. The results of TGA have shown that the combustion of the wood-pellet occurred in the temperature range of
which is much lower than that of Korean anthracite. Activation energies of the wood-pellet and Korean anthracite, determined by using Friedman method were 44.12, 21.45 kcal/mol respectively. Also, their reaction orders(n) and pre-exponential factors(A) were 5.153, 0.7453 and
respectively. In order to find out the combustion mechanism of the wood-pellet and Korean anthracite, twelve solidstate mechanisms defined by Coats Redfern Method were tested. The solid state combustion mechanisms of the woodpellet and Korean anthracite were found to be sigmoidal curve A3 type and a deceleration curve F1 type respectively. Also, from iso-thermal combustion(
) of their char, the combustion characteristics of their char was found. Activation energies of the their char were 27.5, 51.2 kcal/mol respectively. Also, pre-exponential factors(A) were
respectively. Due to the high combustion reactivity of wood-pellet compared with Korean anthracite, combustion atmosphere will be improved by co-combustion with Korean anthracite and wood-pellet.
Study of Pyrolysis Behavior of Alberta Oil Sand by Continuous Operation of Fluidized-Bed Reactor
Shin, Jong-Seon ; Sun, Yang-Kuk ; Park, Young-Cheol ; Bae, Dal-Hee ; Jo, Sung-Ho ; Shun, Do-Won ;
Korean Chemical Engineering Research, volume 48, issue 1, 2010, Pages 68~74
In this study, fluidized-bed pyrolysis has been conducted in order to recover the bitumen contained in the oil sand. Canada Alberta oil sand contains 11.9% of bitumen and the bitumen-derived heavy oil produced in fluidizedbed tends to be upgraded relative to the bitumen. The continuous operation has been performed using
as a fluidization gas at 1 atm and
in a reactor of 170 cm height. The results showed 87.76% of bitumen conversion, where liquid products are 74.45% and gas products are 13.31%.
, and NO and
hydrocarbons in the gas products were analyzed by on-line gas analyzer and gas chromatography, respectively. The pyrolysis oil was analyzed by using proximate analysis, heavy metal analysis, SIMDIS, asphaltenes, and heating value. By SIMDIS analysis, naphtha was 11.50%, middle distillation was 44.83% and heavy oil was 43.66%. It was obvious that the pyrolysis oil was upgraded compared with bitumens.
Phosphor Powders Prepared from Spray Solution with Organic Additives and
Lee, Sang-Ho ; Koo, Hye-Young ; Ko, Da-Rae ; Lee, Su-Min ; Kang, Yun-Chan ;
Korean Chemical Engineering Research, volume 48, issue 1, 2010, Pages 75~79
The precursor powders with thin wall structure were prepared by spray pyrolysis from the spray solution with ethylenediaminetetraacetic acid, citric acid and
phosphor powders formed from the spray solution without organic additives and flux material had sizes of 1~5
and hollow structure with high thickness at post-treatment temperature of
phosphor powders formed from the spray solution with ethylenediaminetetraacetic acid, citric acid and
flux had fine size and plate-like shape. The mean crystallite sizes of the phosphor powders with fine sizes were 23, 35, and 33 nm when the content of
flux were 0, 6, 35 wt% of phosphor. The photoluminescence intensity of the phosphor powders formed from the spray solution with the optimum amount of
flux as 35 wt% was 215% of that of the phosphor powders formed from the spray solution without flux material.
A Kinetic Study of Steam Gasification of Low Rank Coal, Wood Chip and Petroleum Coke
Gong, Su-Jin ; Zhu, Xueyan ; Kim, Yang-Jin ; Song, Byung-Ho ; Yang, Won ; Moon, Woong-Sig ; Byoun, Yoon-Seop ;
Korean Chemical Engineering Research, volume 48, issue 1, 2010, Pages 80~87
Lignite of low rank coal and petroleum coke of high sulfur content can be high potential energy sources for coal gasification process because of their plentiful supply. The kinetic study of steam gasification has been performed in an atmospheric thermobalance with wood chip, lignite, bituminous, anthracite, pet-coke. The effects of gasification temperature(
) and partial pressure of steam(30~90 kPa) on the gasification rate have been investigated. The modified volumetric reaction model was applied to the experimental data to describe the behavior of carbon conversion and to evaluate the needed kinetic parameters. Lignite and wood chip with high volatile content showed high average gasification rates comparing to other fuel and thus they might be proper fuel for gasification processes. The activation energies for wood chip, lignite, bituminous, anthracite, and pet-coke through Arrhenius plot were found to be 260.3, 167.9, 134.6, 82.2, 168.9 kJ/mol, respectively. The expression of apparent reaction rates for steam gasification of various chars have been proposed as basic information for the design of coal gasification processes.
Separation Study of Cytosine and Guanine by HPLC and Aspen Chromatography
Park, Moon-Bae ; Kim, In-Ho ;
Korean Chemical Engineering Research, volume 48, issue 1, 2010, Pages 88~92
DNA structure studies attract many interests in pharmaceutical, biochemical and medical disciplines. Among them, base pairs play a vital role in biological information transfer. Therefore, they need to be analyzed in various ways and the pair of guaninine and cytosine is the present analytical object. Separation of guanine and cytosine was researched by Aspen chromatography simulator and HPLC(High Performance Liquid Chromatography) experiments. Aspen chromatography simulation resulted in various chromatograms with changes of sample concentration, eluent flow rate and number of plate. The resolutions and yields of guanine and cytosine were calculated to obtain a best separation condition.
HPLC column and water/methanol/acetic acid mixture(90/10/0.2) were used for separation of guanine and cytosine. HPLC parameters(resolution and number of theoretical plate) were calculated under different flow rates and sample concentrations. Aspen chromatography simulation and HPLC experimental results were compared with fair agreement.
Measurement of Thermo-physical Properties of Organic Phase Change Materials using Modified T-history Method
Dao, Van-Duong ; Choi, Hong-Ki ; Choi, Ho-Suk ; Oh, Jun-Taek ; Kim, Jong-Kuk ;
Korean Chemical Engineering Research, volume 48, issue 1, 2010, Pages 93~97
In this study, we have measured the thermo-physical properties of pure organic phase change materials (PCMs) and their mixtures which have the melting points from 0 to
by using a modified T-history method. These organic PCMs can be used as coolant materials for packaging and shipping of vaccines. Through measuring the thermophysical properties of pure paraffins, we were able to know that we could improve the reliability of measurement if we considered the melting point of each material and subsequently decided an optimum coolant temperature for each system. The modified T-history method showed a potential usefulness for reliably measuring thermo-physical properties of organic mixtures with avoiding possible inaccuracy of measurement due to using a small amount of sample at DSC measurement.
Biological Synthesis of Au Core-Ag Shell Bimetallic Nanoparticles Using Magnolia kobus Leaf Extract
Song, Jae-Yong ; Kim, Beom-Soo ;
Korean Chemical Engineering Research, volume 48, issue 1, 2010, Pages 98~102
Magnolia kobus leaf extract was used for the synthesis of bimetallic Au core-Ag shell nanoparticles. Gold seeds and silver shells were formed by first treating aqueous solution of
with the plant leaf extract as reducing agent. UV-visible spectroscopy was monitored as a function of reaction time to follow the formation of bimetallic nanoparticles. The synthesized bimetallic nanoparticles were characterized with transmission electron microscopy(TEM), energy dispersive X-ray spectroscopy(EDS), and X-ray photoelectron spectroscopy(XPS). TEM images showed that the bimetallic nanoparticles are a mixture of plate(triangles, pentagons, and hexagons) and spherical structures. The atomic Ag contents of the bimetallic Au/Ag nanoparticles determined from EDS and XPS analysis were 34 and 65 wt%, respectively, suggesting the formation of bimetallic Au core-Ag shell nanostructure. This core-shell type nanostructure is expected to have potential for application in surface enhanced Raman spectroscopy and in the sensitive detection of biomolecules.
Sludge Solubilization by Pre-treatment and its Effect on Methane Production and Sludge Reduction in Anaerobic Digestion
Kim, Dong-Jin ; Kim, Hye-Young ;
Korean Chemical Engineering Research, volume 48, issue 1, 2010, Pages 103~109
Abstract - Anaerobic digestion has been widely used for the treatment of sludge, which is generated from the municipal and industrial wastewater treatment, for its volume reduction and methane production. Many researches on sludge pre-treatment have been carried out in order to enhance the performance of anaerobic digestion by increasing the hydrolysis of sludge which is the rate limiting step of anaerobic digestion. In this study, the effect of pre-treatment on sludge hydrolysis(solubilization), methane production and sludge reduction by anaerobic digestion after thermal, ultrasonic, and thermal-alkali sludge treatment were compared. Thermal-alkali treatment showed 67 and 70% solubilization with municipal and industrial wastewater sludge, respectively, while ultrasonic treatment and thermal treatment gave similar solubilization efficiency of 40% or more. Methane content of the anaerobic digestion gas reached 45~70% and pretreated sludge gave higher methane content than the control sludge. Methane production of thermal, ultrasonic, and thermal-alkali pre-treatment gave 2.6, 2.7, 3.5 times of municipal control sludge and 3.5, 4.1, 4.2 times of industrial control sludge, respectively. Sludge reduction of pre-treated sludge after anaerobic digestion gave 5~19% point higher than that of control sludge, and thermal-alkali treatment showed higher reduction efficiency than thermal and ultrasonic treatment. The results proved that pre-treatment contributed significantly not only for the methane production but also for the cost reduction of sludge treatment and disposal, and thermal-alkali treatment gave the best performance for the sludge treatment.
Application of a DAEM Method for a Comparison of Devolatilization Kinetics of Imported Coals
Kim, Ryang-Gyoon ; Song, Ju-Hun ; Lee, Byoung-Hwa ; Chang, Young-June ; Jeon, Chung-Hwan ;
Korean Chemical Engineering Research, volume 48, issue 1, 2010, Pages 110~115
The experiment was designed to compare pyrolysis kinetics of two different classes of imported coal. The pyrolysis behaviors of the coals were first observed with thermogravimetric analyzer(TGA). The kinetic analysis was further done based on a new distributed activation energy model(New DAEM). During the analysis, weight loss curves measured at three different heating rates were used to obtain the activation energy distribution function curve f(E) of a given coal sample where a mean activation energy is determined by its peak. The results show a significant difference in the mean activation energy between two coals for the pyrolytic reaction. The prediction of a chemical percolation devolatilization(CPD) model where the kinetics obtained from the New DAEM method were incorporated is in much closer agreement with an experimental data of TGA particularly for the bituminous coal.
Research on Desulfurization and Dust Removal Characteristics in Oxy-PC Combustion system
Min, Tai-Jin ; Keel, Sang-In ; Yun, Jin-Han ; Roh, Seon-Ah ; Han, Bang-Woo ; Lee, Hyung-Keun ; Kim, Sang-Soo ; Lee, Kang-Soo ; Seo, Sang-Il ; Kim, Young-Ju ;
Korean Chemical Engineering Research, volume 48, issue 1, 2010, Pages 116~120
is regarded as one of the greenhouse gases(GHG), which is the main reason of climate change. In order to achieve lower
emissions, several efforts have been conducted worldwide.
capture & storage(CCS) technology development is needed for a coal-fired combustion power plant because of huge
emission. Oxy fuel combustion, one of the CCS technologies has been considered as a primary concern, nowadays. Oxy-fuel combustion needs flue gas recirculation(FGR) for stable operation and enrichment of
concentration in the flue gas. FGR adoption for oxy-fuel combustion requires development of effective desulfurization and dust removal technology. In this study, desulfurization characteristics of lime and dust removal technology have been researched in the laboratory scale coal combustor.
Enzyme Activity of Lipase Immobilized Non-Woven Fabric for Biodiesel Production
Kim, Ye-Jin ; Lee, Sung-Hae ; Hong, Sung-Kyu ; Kim, Min ; Park, Sang-Jin ;
Korean Chemical Engineering Research, volume 48, issue 1, 2010, Pages 121~127
This study is to optimize the enzyme(lipase) activity for biodiesel production. The ion-exchanged non-woven fabrics(EtA, DEA-EtA non-woven fabric) containing ethanolamine, diethylamine groups are used by radiation induced grafted polymerization onto a non-woven fabric for more effective immobilization of lipase. Since the porous hollow fiber membranes are showed the low throughputibehe non-woven fabric membranes are used for biodiesel production. The physical charateristics of enzyme immobilized and the enzyme activity to EtA and DEA-EtA non-woven fabrics are studied. The EtA non-woven fabrics are quite similar to DEA-EtA non-woven fabric for the amount of enzyme immobilized(EtA non-woven fabric:15.69 mg/g, DEA-EtA non-woven fabric:14.45 mg/g) but DEA-EtA nonwoven fabrics have shown the lower permeabiliquite the organic solvent than the EtA non-woven fabrics(EtA non-woven fabric:3.50 mol/
, DEA-EtA non-woven fabric:0.38 mol/
). Optimum characteristics of ehe non-woven fabric membranes and the limilaractivity are also investigated for the effective biodiesel production.