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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 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
Effect of Graphite Nanofibers Addition on the Electrochemical Behaviors of Platinum Nanoparticles Deposited on Activated Carbons
Jo, Won-Bin ; Oh, Mi-Soon ; Kim, Ju-Hyun ; Kim, Seok ;
Korean Chemical Engineering Research, volume 48, issue 6, 2010, Pages 673~678
In the present study, mixed carbon-supported platinum(Pt) nanoparticles were prepared by a chemical reduction method of Pt precursor solution on two types of carbon materials such as activated carbons(ACs) and graphite nanofibers(GNFs). Average crystalline sizes and loading levels of Pt metal particles could be controlled by changing a content of GNFs. The highest electroactivity for methanol oxidation was obtained by preparing the carbon supports having 15 wt% GNFs. Furthermore, with an increase of GNFs content from 0% to 15%, an electrical conductivity was changed from
S/cm. By an introduction of 10 wt% GNFs additive, the electroactivity of platinum particles was enhanced, but was saturated in the case of 15 wt% GNFs contents. This was related with the fact that the electroactivity change was dependent on the electrical conductivity of mixed carbon supports and Pt particle deposition content or deposition morphology.
Regeneration of TS-1 Catalyst During Phenol Hydroxylation(Calcination temperature dependence)
Kwon, Song-Yi ; Yoon, Song-Hun ; Um, Kyung-Sub ; Lee, Jae-Wook ; Lee, Chul-Wee ;
Korean Chemical Engineering Research, volume 48, issue 6, 2010, Pages 679~683
In this study, calcination temperature dependence of TS-1 catalyst was investigated in the hydroxylation of phenol with hydrogen peroxide during the regeneration of catalyst. Catalyst was regenerated 5 times by calcining at
, respectively. When the catalyst was regenerated at
after 5th regeneration phenol conversion was decreased from 22.9% to 15.1% and at
after 5th regeneration phenol conversion was decreased from 22.9% to 18.8%. For formation ratio of catechol/hydroquinone was increased from 1.28 to 1.45 after 5th regeneration at
, and from 1.28 to 1.20 after 5th regeneration at
. The main reasons for deactivation of the catalyst were suggested by analyzing chemical/physical properties with XRD, UV-vis spectra,
adsorption/desorption and TGA, and evaluating the catalytic activity such as phenol conversion and product selectivity.
Dehydration of D-xylose over SAPO Catalysts Synthesized with Various Structure Directing Agents
Kim, Saet-Byul ; You, Su-Jin ; Kim, Yong-Tae ; Chae, Ho-Jeong ; Jeong, Soon-Yon ; Park, Eun-Duck ;
Korean Chemical Engineering Research, volume 48, issue 6, 2010, Pages 684~689
We synthesized a variety of SAPO catalysts with various structure directing agents by the hydrothermal method and applied them to the D-xylose dehydration. Single or mixtures of organic amines, viz. tetraethylammonium hydroxide(TEAOH), dipropylamine(DPA), diethylamine(DEA), morpholine and diethanolamine(DEtA) were used as structure directing agents. The
-temperature programmed desorption(TPD) and temperature programmed oxidation(TPO) were conducted to characterize SAPO catalysts. Among tested SAPO catalysts, the SAPO-34 synthesized with morpholine showed the highest furfural yield. The external surface area as well as the surface concentration of acid sites appeared to affect the catalytic activity for the dehydration of xylose into furfural.
Anti-oxidation and Anti-atopic Dermatitis Effect of Herbal Wood Vinegar
Kim, Ta-Gon ; Nho, Hwa-Jung ; Jun, Sang-Hui ; Kim, Kang-Bae ; Kim, Don-Guk ;
Korean Chemical Engineering Research, volume 48, issue 6, 2010, Pages 690~694
In this study, herbal wood vinegar including Bambusoideae, Cinnamomi Cortex, Zingiberis Rhizoma was tested to see possibility for cosmetic or skin related medicine. Anti-oxidation effect of herbal wood vinegar was tested by DPPH free radical scavenging activity, and showed 97% inhibition rate at 50
. Anti-bacterial effect was tested by disc diffusion method, and it indicated strong anti-bacterial activity against normal skin flora Staphylococcus aureus. Whitening effect was measured by tyrosinase inhibition assay, and it was lower compared with vitamin C. Stability test was done by MTT assay, and cell toxicity was relatively high. Stability was also checked, and there was not significant change in color, aroma, appearance and pH during storage. Anti-atopic dermatitis test was done by hairless mouse and herbal wood vinegar recovered damaged skin to almost normal condition after 9 days of application. IgE concentration in herbal wood vinegar treated mouse was also reduced 30% compared with control. From the study, herbal wood vinegar showed good anti-oxidation, anti-bacterial and anti-atopic dermatitis effect, and had promising application in cosmetic or skin related medicine.
Life Expectancy Estimation of the Propellants KM10 using High Temperature Acceleration Aging Tests and Stockpile Analysis Test
Cho, Ki-Hong ; Kim, Eui-Yong ;
Korean Chemical Engineering Research, volume 48, issue 6, 2010, Pages 695~699
The propellant KM10, a single propellant manufactured from nitrocellulose, was known to cause natural degradation phenomena at long term storage. In this study, the self-life was estimated using high temperature acceleration aging tests and stockpile analysis test. For the life expectancy estimation, Arrhenius equation and Berthelot equation were used in the high temperature acceleration tests, and the first order regression was used in the Stockpile analysis test. The self-life of propellant KM10 using the Arrhenius equation and Berthelot equation showed significantly different results as 43.73, 16.53 years in the high temperature acceleration test, and it showed 42.94 years in the Stockpile analysis test. The value of self-life predicted by Arrhenius equation was reasonable when compared with the result of E. R. Bixon.
Anti-acne and Anti-atopic Dermatitis Effect of Plant Extracts Including Eucommia ulmoides Oliv and Phellodendron amurense
Kim, Gi-Eun ; Kim, Jin-Hong ; Hong, Seul-Ki ; Kim, Ta-Gon ; Kim, Don-Guk ;
Korean Chemical Engineering Research, volume 48, issue 6, 2010, Pages 700~703
In this study, plant extracts including Eucommia ulmoides Oliv. and Phellodendron amurense were studied to test possible application for cosmetics and skin related medicine. Anti-oxidation effect of plant extracts was measured by DPPH free radical scavenging activity and it was insignificant at low concentration, however, it was as good as vitamin C, excellent anti-oxidation agent, at 1000
. Anti-bacterial effect was tested by disc diffusion method, and plant extracts showed mild anti-bacterial effect for normal skin flora, Staphylococcus epidermidis while it indicated strong anti-bacterial effect for acne inducing Propionibacterium acne. Therefore it had powerful potential for anti-acne material because of selectivity. Anti-atopic dermatitis effect was tested by hairless mouse and plant extracts recovered damaged skin to near normal condition after 14 days of treatment. IgE concentration in treated mouse was decreased 16% compared with control. From the research, plant extracts indicated strong anti-acne and anti-atopic dermatitis effect, and showed strong potential for cosmetics and skin related medicine.
Optimization of Ammonia Percolation Process for Ethanol Production from Miscanthus Sinensis
Kim, Kyoung-Seob ; Kim, Jun-Seok ;
Korean Chemical Engineering Research, volume 48, issue 6, 2010, Pages 704~711
generation) is difficult to hydrolyze due to the presence of lignin and the technology developed for cellulose fermentation to ethanol is not yet economically viable. However, recent advances in the extremely new field of biotechnology for the ethanol production are making it possible to use of agriculture residuals and nonedible crops biomass, e.q., rice straw and miscanthus sinensis, because of their several superior aspects as agriculture residual and nonedible crops biomass: low lignin, high contents of carbohydrates. In this article, as the basic study of AP(Ammonia Percolation), the properties and the optium conditions of process were established, and then the overall efficiency of AP was investigated. The important independent variables for AP process were selected as ammonia concentration, reaction temperature, and reaction time. The percolation condition for maximizing the content of cellulose, the enzymatic digestibility, and the lignin removal was optimized using RSM(Response Surface Methodology). The determined optimum condition is ammonia concentration; 11.27%, reaction temperature;
, and reaction time; 10.01 min. The satisfying results were obtained under this optimized condition, that is, the results are as follows: cellulose content(relative); 39.98%, lignin content(relative); 8.01%, and enzymatic digestibility; 85.89%.
Crystallization Kinetics of Reactive Dye(Reactive Red 218) in Salting-out Crystallization System
Han, Hyun-Kak ; Kang, Hye-Jin ; Lee, Jong-Hoon ;
Korean Chemical Engineering Research, volume 48, issue 6, 2010, Pages 712~716
Salting-out technique was adopted to crystallize dye crystals from dye solution. Solubility of dye solution and crystallization kinetics of Reactive Red 218 was investigated. Solubility of dye solution is decreased by higher KCl concentration. The empirical expressions of salting-out crystallization kinetics for Reactive Red 218 in continuous MSMPR crystallizer was
Comparison of Partial Least Squares and Support Vector Machine for the Flash Point Prediction of Organic Compounds
Lee, Chang-Jun ; Ko, Jae-Wook ; Lee, Gi-Baek ;
Korean Chemical Engineering Research, volume 48, issue 6, 2010, Pages 717~724
The flash point is one of the most important physical properties used to determine the potential for fire and explosion hazards of flammable liquids. Despite the needs of the experimental flash point data for the design and construction of chemical plants, there is often a significant gap between the demands for the data and their availability. This study have built and compared two models of partial least squares(PLS) and support vector machine(SVM) to predict the experimental flash points of 893 organic compounds out of DIPPR 801. As the independent variables of the models, 65 functional groups were chosen based on the group contribution method that was oriented from the assumption that each fragment of a molecule contributes a certain amount to the value of its physical property, and the logarithm of molecular weight was added. The prediction errors calculated from cross-validation were employed to determine the optimal parameters of two models. And, an optimization technique should be used to get three parameters of SVM model. This work adopted particle swarm optimization that is one of heuristic optimization methods. As the selection of training data can affect the prediction performance, 100 data sets of randomly selected data were generated and tested. The PLS and SVM results of the average absolute errors for the whole data range from 13.86 K to 14.55 K and 7.44 K to 10.26 K, respectively, indicating that the predictive ability of the SVM is much superior than PLS.
Study on Control Efficiency of Fully Thermally Coupled Distillation Column for BTX Separation
Kim, Mi-Hee ; Park, Chang-Won ; Lee, Ju-Yeong ; Kim, Young-Han ; Hwang, Kyu-Suk ;
Korean Chemical Engineering Research, volume 48, issue 6, 2010, Pages 725~730
The fully thermally coupled distillation columns(FTCDC) are thermodynamically more efficient than conventional columns. Despite these advantages, industry has been reluctant to use FTCDC. This can be largely attributed to the lack of established design procedures and column operability. In this study, the
control structure was applied to control the FTCDC which was simulated using Aspen HYSYS on the possible control structure of 4 kinds and control performance was investigated. As the result of dynamic simulations, one of the proposed structures had better controllability of product compositions and control efficiency was evaluated.
Preparation and Property of SBS Ion-exchange Membrane Via Post-sulfonation
Choi, Yong-Jae ; Hwang, Eui-Hwan ; Hwang, Taek-Sung ;
Korean Chemical Engineering Research, volume 48, issue 6, 2010, Pages 731~736
In this study, the sulfonated SBS cation-exchange membrane was prepared by post-sulfonation. Degree of sulfonation(DS), water-uptake, ion exchange capacity and electrical resistance and conductivity of sulfonated SBS were investigated as a function of sulfonation time. The DS of sulfonated SBS membrane was increased with increasing the reaction time and concentration of sulfuric acid. The maximum value of DS was 24.0%. And also, the water uptake and ion exchange capacity of the sulfonated SBS membrane were increased as increasing the value of DS. The values of water uptake and IEC were 41.2% and 0.80 meq/g, respectively. The electrical resistance and conductivity of the membrane showed 23.6
Leakage Current and Threshold Voltage Characteristics of a-Si:H TFT Depending on Process Conditions
Yang, Kee-Jeong ; Yoon, Do-Young ;
Korean Chemical Engineering Research, volume 48, issue 6, 2010, Pages 737~740
High leakage current and threshold voltage shift(
) are demerits of a-Si:H TFT. These characteristics are influenced by gate insulator and active layer film quality, surface roughness, and process conditions. The purpose of this investigation is to improve off current(
characteristics. Nitrogen-rich deposition condition was applied to gate insulator, and hydrogen-rich deposition condition was applied to active layer to reduce electron trap site and improve film density.
improved from 1.01 pA to 0.18 pA at
improved from -1.89 V to 1.22 V.
Phospholipids Isolation from Squid Viscera Residues After Supercritical Carbon Dioxide Extraction
U, Pyoung-Ook ; Chun, Byung-Soo ;
Korean Chemical Engineering Research, volume 48, issue 6, 2010, Pages 741~746
Phospholipids were recovered from squid viscera residues by ethanol extraction after supercritical carbon dioxide(
) extraction and from squid viscera was not processed
by various organic solvent extraction.
extraction were performed at
and 20 MPa for removal of non polar lipid molecules from freeze dried squid viscera sample. Phospholipids were extracted from freeze dried squid viscera sample by chloroform, hexane, methanol, and ethanol and from
extracted squid viscera sample by ethanol. The pH was fixed at 5.7 for all phospholipids extraction conditions. Phospholipid classes were analyzed by HPLC equipped with evaporative light scattering detector (ELSD). Phosphatidyl choline(PC) extracted by ethanol from
extracted residues was higher than that of extracted by ethanol from squid viscera. But phosphatidyl ethanolamine(PE) and phosphatidic acid(PA) were extracted higher percentage in raw squid viscera. The fatty acid compositions in phospholipids extract by ethanol extract from
extracted residues were analyzed by gas chromatography(GC). Docosahexanoic acid(DHA) was found in highest percentage in phospholipid extract.
Amino Acid Recovery from Brown Seaweed(Undaria pinnatifida) Using Subcritical Water Hydrolysis
Kwon, Kyung-Tae ; Jung, Go-Woon ; Chun, Byung-Soo ;
Korean Chemical Engineering Research, volume 48, issue 6, 2010, Pages 747~751
The objective of this research were to produce amino acids from freezing-dried brown seaweed(Undaria pinnatifida) powder by sub- and supercritical water hydrolysis and to characterize the products. The hydrolysis was carried out in a batch type reactor consisting of 4.6 cm inside diameter and 200
vessel and stir made of Hastelloy 276. A stir inside the reactor was continuously moving at 100 rpm. Brown seaweed powder and 100 mL of 1% acetic acid in distilled water were charged into the reactor at a ratio of 1:100(w/v). The applied conditions were
, respectively for 1 hour. The total amino acid content was found to be significantly higher in brown seaweed hydrolyzed by low temperature comparing to high temperature. The amounts of low molecular weight amino acids(glycine, alanine, serine etc) were higher than that of high molecular weight amino acids. The maximum yields of amino acids were produced at low temperature(
) with acid catalyst.
Investigation on Desorption Characteristics of VOCs Adsorbed on used Activated Carbons Collected from Painting Process
Kim, Joo-Yeon ; Yoon, Sung-Min ; Park, Kuny-Ik ; Yoon, Soo-Kyung ; Kil, In-Sub ; Park, Hui-Jae ; Rhee, Young-Woo ;
Korean Chemical Engineering Research, volume 48, issue 6, 2010, Pages 752~756
Desorption reaction characteristics of the used activated carbons collected from painting process in Shiwha/Banwal industrial complex were investigated. Thermogravimetric analyzer was used to investigate the desorption characteristics. Activation energies and reaction orders for desorption reaction characteristics of used activated carbons were estimated by employing Friedman method and Freeman-Carroll method. In the used activated carbons collected from painting process, it was found that the activation energies were 20.6~43.2 kJ/mol in Friedman method and 12.3~26.5 kJ/mol in Freeman-carroll method, and reaction orders were 0.1~1.7.
Study of NIR in-line Monitoring of Physicochemical Changes during the Crystallization Process of Aspirin
Lee, Hea-Eun ; Wang, In-Chun ; Lee, Min-Jeong ; Seo, Da-Young ; Shin, Sang-Mun ; Choi, Yong-Sun ; Choi, Guang-Jin ;
Korean Chemical Engineering Research, volume 48, issue 6, 2010, Pages 757~762
Since the quality and performance of medicinal products are heavily dependent upon the size, shape and polymorphism of active pharmaceutical ingredients(APIs), their crystallization has been regarded as one of the most important pharmaceutical processes. In this study, NIR-based inline measurements were employed to monitor key attributes of API particles real-time during the crystallization process. Principal component analysis(PCA) method was selected to correlate inline NIR spectra while the well-known aspirin was studied as a model drug. According to our characterization results, the ratio of ethanol to acetone did not cause any change in polymorphism, but resulted in a significant difference in the nucleation time, crystal growth and crystal shape. These phenomenological changes were well correlated with the PCA's implications. It turned out that the NIR-based inline monitoring technology can be employed well in observing and predicting key quality attributes such as crystal size during pharmaceutical crystallization processes.
High-pressure Phase Behavior of 1-propanol / Carbon Dioxide Binary System
Han, Chang-Nam ; Kang, Choon-Hyoung ;
Korean Chemical Engineering Research, volume 48, issue 6, 2010, Pages 763~767
High-pressure phase behavior for the binary mixture of 1-propanol with supercritical
has been measured by means of a high-pressure phase equilibrium apparatus equipped with a variable-volume view cell. The equilibrium loci of the pressure - composition and pressure - temperature were obtained for the binary mixture of 1-propanol +
system at 305.15 K, 313.15 K, 323.15 K and 333.15 K, and from 2 MPa to 11 MPa. The critical temperature of the mixture increased with the temperature. The pressure-composition line for the binary mixture of
-1-propanol system showed a typical type-II phase behavior. The experimental P-x envelopes were correlated by using the Peng- Robinson equation of state in a satisfactory manner to obtain the parameters with
Adsorption and Desorption Dynamics of Ethane and Ethylene in Displacement Desorption Process using Faujasite Zeolite
Lee, Ji-In ; Park, Jong-Ho ; Beum, Hee-Tae ; Yi, Kwang-Bok ; Ko, Chang-Hyun ; Park, Sung-Youl ; Lee, Yong-Taek ; Kim, Jong-Nam ;
Korean Chemical Engineering Research, volume 48, issue 6, 2010, Pages 768~775
Adsorption dynamics of ethane/ethylene mixture gas and desorption dynamics during the displacement desorption with propane as a desorbent in the column filled with faujasite adsorbent were investigated experimentally and theoretically. The simulation that adopted heat and mass balance and an ideal adsorbed solution theory (IAST) for the multicomponent adsorption equilibrium well predicted the experimental breakthrough curves of the adsorption and desorption. At the adsorption breakthrough experiments, roll-ups of ethane increased as the adsorption pressure increased and the adsorption temperature decreased. During the displacement desorption with propane in the column saturated with ethane/ethylene mixture gas, almost 100% of ethylene was obtained for a certain time interval. The adsorption strength of the desorbent greatly affected the adsorption and re-adsorption dynamics of ethylene. The re-adsorption capacity for ethylene has been greatly reduced when iso-propane, which is stronger desorbent than propane, was used as desorbent. It was found from the simulation that the performance of the displacement desorption process would be superior when the ratio of
was 0.83, that is, the adsorption strengths of ethylene and the desorbent were similar.
Partial Oxidation of Methane for Hydrogen Production over Co and Ni Catalysts
Lee, Sang-Sik ; Hong, Ju-Hwan ; Ha, Ho-Jung ; Kim, Byung-Kwan ; Han, Jong-Dae ;
Korean Chemical Engineering Research, volume 48, issue 6, 2010, Pages 776~783
Co and Ni catalysts supported on
for partial oxidation of methane producing hydrogen were synthesized using impregnation to incipient wetness. The activities of these catalysts for the partial oxidation of methane was investigated at 1 atm and
=2.0 in the temperature range of
. The reaction activity of Ni/
catalysts with different loading was investigated. And the beneficial effects of Ni addition to Co/
and the promotional effects of Ce and La addition to Ni/Al2O3 and Co/
were investigated. These catalysts were characterized by XRD and SEM/EDX. Comparing catalyst loadings, 10 wt% Co and 10 wt% Ni were found to be optimal at the experimental conditions. The 10 wt% Ni/
and 10 wt% Co/
catalysts in partial oxidation of methane showed
conversions and CO selectivity close to the thermodynamic equilibrium levels, but showed lower
selectivity than equilibrium level. The addition of Ni to Co/
selectivity but beneficial effect was not observed in the
conversion. Addition of Ce to Co/
and addition of La to Ni/
a improved the
conversion level and
Adsorption Analysis of VOCs of Zeolite Synthesized by Coal Fly Ash in a Fixed-bed Adsorber
Kim, Seong-Soo ; Lee, Chang-Han ; Park, Sang-Wook ;
Korean Chemical Engineering Research, volume 48, issue 6, 2010, Pages 784~790
VOCs such as acetone, benzene, toluene, ethylbenzene were adsorbed in a fixed-bed adsorber using zeolite synthesized from coal fly ash and 4 kinds of activated carbon at 101.3 kPa. The adsorber was operated batchwise with the charge of 5 g adsorbent to obtain the breakthrough curve of VOCs. Experiments were carried out at
, nitrogen flow rate of 70
/min and sparger temperature of
. The deactivation model was tested for these curves by combining the adsorption of VOCs and the deactivation of adsorbent particles. The observed values of the adsorption rate constant and the deactivation rate constant were evaluated through analysis of the experimental breakthrough data using a nonlinear least square technique. The experimental breakthrough data were fitted very well to the deactivation model than the adsorption isotherm models in the literature. Also, adsorption capacities of adsorbents were obtained from the breakthrough curve to observe the correlation between adsorption capacity and the physical properties of VOCs.
A Study on the Cell Structure for Capacitive Deionization System
Lee, Ju-Young ; Seo, Seok-Jun ; Park, Jung-Woo ; Moon, Seung-Hyeon ;
Korean Chemical Engineering Research, volume 48, issue 6, 2010, Pages 791~794
This study presents channel design of a CDI stack to achieve high removal efficiency in a large scale by applying parallel flow structure with a concentrated stream. The flow pattern in the stack was simulated by COMSOL Multiphysics program. To prove the salt removal performance, a unit cell and 20 cell stacks were tested at a flow rate condition of 18 ml/min and 360 ml/min, respectively. The removal efficiencies of the unit cell and the 20 cell stacks were obtained as 70.8 % and 75.6 %, respectively, with 100 mg/L sodium chloride solution. During the operation of cell test, water pressures of unit cell and 20 cell pair stack maintained in the ranges of 1.1 psi and 1.3~1.5 psi, respectively. It was demonstrated that the parallel cell structure with two concentrated streams can be employed in a large scale CDI for salt removal.