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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 53, Issue 6 - Dec 2015
Volume 53, Issue 5 - Oct 2015
Volume 53, Issue 4 - Aug 2015
Volume 53, Issue 3 - Jun 2015
Volume 53, Issue 2 - Apr 2015
Volume 53, Issue 1 - Feb 2015
Selecting the target year
Effect of Flow Rates of Feed and Sweep Gas on Oxygen Permeation Properties of Ba
Park, Se Hyung ; Sonn, Jong Suk ; Lee, Hong Joo ; Park, Jung Hoon ;
Korean Chemical Engineering Research, volume 53, issue 4, 2015, Pages 407~411
DOI : 10.9713/kcer.2015.53.4.407
Dense ceramic membranes have been prepared using the commercial perovsikite
, powders synthesized by the solid state reaction method. The as-synthesized powders were compressed into disks with 1.0 mm of thickness and the disk was sintered at
for 2 hr. The oxygen permeation flux of
membrane increased with the increasing temperature and oxygen partial pressure. The activation energy for oxygen permeation was increased with the increasing oxygen partial pressure. Oxygen permeation flux at
were measured at various flow rates of feed and sweep gas. It has been demonstrated that oxygen permeability increased at elevated flow rates of both gases, but the sweep gas is more influential.
Measurement of Hydrogen Crossover During PEMFC Operation
Jeong, Jaejin ; Jeong, Jaehyeun ; Kim, Saehoon ; Ahn, Byungki ; Ko, Jaijoon ; Park, Kwonpil ;
Korean Chemical Engineering Research, volume 53, issue 4, 2015, Pages 412~416
DOI : 10.9713/kcer.2015.53.4.412
To evaluate the performance and durability of membrane, measurement of hydrogen crossover is needed during PEMFC(Proton Exchange Membrane Fuel Cells) operation. In this work, concentration of hydrogen at cathode was analysed by gas chromatograph during operation suppling with air instead of inert gas into the cathode. The hydrogen permeated through membrane reacted with oxygen at cathode and then the concentration of hydrogen was lower than in case inert gas was supplied. Hydrogen concentration decreased as the flow rate of air increased at cathode. Increase of temperature, humidity and pressure of anode gas enhanced the hydrogen concentration at cathode. The hydrogen concentration was about 5.0 ppm at current density of
during general PEMFC operation.
Pretreatment of Helianthus tuberosus Residue by Two-Stage Flow Through Process
Park, Yong Cheol ; Kim, Jun Seok ;
Korean Chemical Engineering Research, volume 53, issue 4, 2015, Pages 417~424
DOI : 10.9713/kcer.2015.53.4.417
In this study, the pretreatment of Helianthus tuberosus residue had been performed. The two-stage pretreatment on flow-through process were applied in the interests of increase of sugar production yield on enzymatic saccharification. The delignification by aqueous ammonia and the fractionation of hemicellulose by sulfuric acid solution as pretreatment solution were confirmed for effects of enzymatic saccharification. Two-stage pretreatment process was performed using aqueous ammonia and sulfuric acid. The first step was performed with aqueous ammonia for 40 min at
and the second step was performed with sulfuric acid solution for 20 min at
. And then, the first step was performed with sulfuric acid solution and the second step was pretreated with aqueous ammonia. At this time, the glucose production was 30.7 g and the glucose yield was 72.4% in the first step process with aqueous ammonia. And, the glucose production was 20.9 g and the glucose yield was 49.3% in the first step process with sulfuric acid solution.
Synthesis of ZSM-5 on the Surface of Foam Type Porous SiC Support
Jung, Eunjin ; Lee, Yoon Joo ; Won, Ji Yeon ; Kim, Younghee ; Kim, Soo Ryong ; Shin, Dong-Geun ; Lee, Hyun Jae ; Kwon, Woo Teck ;
Korean Chemical Engineering Research, volume 53, issue 4, 2015, Pages 425~430
DOI : 10.9713/kcer.2015.53.4.425
ZSM-5 crystals grew by hydrothermal synthesis method on the surface of foam type porous silicon carbide ceramics which fabricated by polymer replica method. Oxide layer was developed on the surface of the porous silicon carbide ceramics to induce growth of ZSM-5 from the surface. In this study, hydrothermal synthesis was carried out for 7 h at
and TPAOH as raw materials in the presence of the porous silicon carbide ceramics. X-ray Powder Diffraction (XRD) and Scanning Electron Microscope (SEM) analyses were confirmed
sized ZSM-5 crystals have grown on the surface of porous silicon carbide ceramics. BET data shows that small pores about
size drastically enhanced and surface area increased from
after ZSM-5 synthesis on the surface of foam type porous silicon carbide ceramics.
Safety Enhancement of LPG Terminal by LOPA & SIF Method
Lee, Il Jae ; Kim, Rae Hyun ;
Korean Chemical Engineering Research, volume 53, issue 4, 2015, Pages 431~439
DOI : 10.9713/kcer.2015.53.4.431
The methods which decrease the accident hazards of LPG(Liquefied Petroleum Gas) terminal on the basis of butane & propane storage tanks by applying HAZOP(Hazard and Operability), LOPA(Layer of Protection Analysis) and SIL(Safety Integrity Level) are suggested. The accident scenarios were derived by analyzing latent risks through the HAZOP. The scenarios which would have the big damage effect in accidents were selected and then LOPA was assessed by analyzing IPL(Independent Protection Layer) about the correspond accident scenarios. The improved methods were proposed on the basis of level of SIF(Safety Instrumented Functions) as a IPL considering satisfied condition of risk tolerance criteria(
). In addition, The proposed IPLs were basis on the economic analysis. The effect of SIF as a IPL considering the changes of accident frequency was studied in case of the accident scenarios derived from the concerned process.
Effects of Operating Variables on the Solid Circulation Rate in a Three-phase Circulating Fluidized Bed
Kim, Min Kon ; Hong, Sung Kyu ; Lim, Dae Ho ; Yoo, Dong Jun ; Kang, Yong ;
Korean Chemical Engineering Research, volume 53, issue 4, 2015, Pages 440~444
DOI : 10.9713/kcer.2015.53.4.440
Effects of operating variables on the solid circulation rate were investigated in a three-phase circulating fluidized bed, of which inside diameter was 0.102m and height was 3.5m, respectively. Gas velocity, primary and secondary liquid velocities, particle size and height of solid particles piled up in the solid recycle device were chosen as operating variables. The solid circulation rate increased with increasing primary and secondary liquid velocities and height of solid particles piled up in the solid recycle device, but decreased with increasing particle size. The value of solid circulation rate decreased only slightly with increasing gas velocity in the riser. The values of solid circulation rate were well correlated in terms of dimensionless groups within the experimental conditions.
Extraction of Genistein from Sophora flavescens with Supercritical Carbon Dioxide
Han, Chang-Nam ; Kang, Choon-Hyoung ;
Korean Chemical Engineering Research, volume 53, issue 4, 2015, Pages 445~449
DOI : 10.9713/kcer.2015.53.4.445
This study was directed to finding an optimum extraction condition of genistein from the S. flavescens with supercritical carbon dioxide as a solvent. In this effort, effects of the extraction conditions including pressure, temperature and a co-solvent on the extraction efficiency were investigated. The aqueous ethanol and methanol solutions were used as co-solvents while the tested operating pressure and temperature ranges were from 200 bar to 300 bar and from 308.15 K to 323.15 K, respectively. The concentration of genistein was determined by means of HPLC equipped with a UV detector. From the results, it was observed that an increase in pressure led to the higher extraction efficiency. Further, methanol showed better performance as a co-slovent than ethanol. The DPPH radical scavenging activities were measured to compare antioxidant activities of S. flavescens extracts.
Simulation and Optimization Study on the Pressure-Swing Distillation of Ethanol-Benzene Azeotrope
Park, Hoey Kyung ; Kim, Dong Sun ; Cho, JungHo ;
Korean Chemical Engineering Research, volume 53, issue 4, 2015, Pages 450~456
DOI : 10.9713/kcer.2015.53.4.450
In the present study, modelling and optimization of ethanol-benzene separation process were performed using pressure-swing distillation. Order to obtain a reliable results, vapour-liquid equilibrium (VLE) experiments of ethanol-benzene binary system were performed. The parameters of thermodynamic equation were determined using experimental data and the regression. The pressure-swing distillation process optimization was performed to obtain high purity ethanol and high purity benzene into a low-high pressure columns configuration and a high-low pressure columns configuration. The heat duty values of the reboiler from simulation were compared, and the process was optimized to minimize the heat duty.
Application of Emulsion Liquid Membrane to Removal of Fermentation Inhibitors from Simulated Hemicellulosic Hydrolysates
Lee, Sang Cheol ;
Korean Chemical Engineering Research, volume 53, issue 4, 2015, Pages 457~462
DOI : 10.9713/kcer.2015.53.4.457
Hemicellulosic hydrolysates contain not only sugars but also several kinds of ethanol fermentation inhibitory substances such as carboxylic acids, furans and phenolic compounds. In this work, emulsion liquid membrane (ELM) was chosen as a separation technology to remove the inhibitors. A basic simulated hemicellulosic hydrolysate was composed of xylose as sugar, dilute sulfuric acid solution as solvent, and acetic acid as carboxylic acid, and furfural as furan derivative or p-hydroxybenzoic acid(HBA) as phenolic compound was added to the hydrolysate when necessary. Acetic acid and HBA as weak acid could be selectively removed from the hydrolysates in all the ELM systems considered here, but furfural as aldehyde was quite hard to remove. Also, when HBA was added to the basic simulated hemicellulosic hydrolysate, both of acetic acid and HBA in the feed phase could be selectively removed up to 99% in an ELM system with tributyl phosphate as extractant.
The Nature of Acid-Catalyzed Acetalization Reaction of 1,2-Propylene Glycol and Acetaldehyde
Cheng, Chen ; Chen, Hui ; Li, Xia ; Hu, Jianli ; Liang, Baochen ;
Korean Chemical Engineering Research, volume 53, issue 4, 2015, Pages 463~467
DOI : 10.9713/kcer.2015.53.4.463
We investigated catalytic activity of ion-exchange resins in acetalization of 1,2-propylene glycol with acetaldehyde. The impacts of reaction variables, such as temperature, reaction time, catalyst loading and feedstock composition, on the conversion of 1,2-propylene glycol were measured. The life of the catalyst was also studied. Furthermore, the reaction kinetics of 1,2-propylene glycol acetalization was studied. It was found that reaction rate followed the first-order kinetics to acetaldehyde and 1,2-propylene glycol, respectively. Therefore, overall acetalization reaction should follow the second-order reaction kinetics, expressed as. Key words: 1,2-propylene Glycol, 2,4-dimethyl-1,3-dioxolane, Ion-exchange Resin, Polyhydroxy Compounds, Acetalization
An Analysis of Lipid Contents Produced from Three Different Microalgae Depending on the Lighting Period and Their Saccharification Conversion
Lim, Su-Bin ; Jeong, Ji-Won ; Yeon, Jae-Sung ; Lee, Na-Kyung ; Won, Jong-In ;
Korean Chemical Engineering Research, volume 53, issue 4, 2015, Pages 468~471
DOI : 10.9713/kcer.2015.53.4.468
Microalgae have the advantages of being able to utilize the solar energy and culturing at a low cost. In particular, microalgae have a great potential in the production of biodiesel due to the high lipid content. Lipids produced from microalgae are converted to fatty acid methyl ester (FAME) by trans-esterification reaction and FAME is called a biodiesel in general. In addition, microalgae can also be utilized as a substrate for ethanol fermentation after saccharification reaction. In this study, three types of microalgae (Nanochloris, Dunaliella tertiolecta, Tetraselmis) were cultured and their lipid contents were compared. In addition, the effects of lighting period on the growth rate and lipid content were studied. Finally, the amounts of glucose produced from each saccharified microalgae were investigated. As a result, we demonstrated that D. tertiolecta has 43.6% higher lipid content and 22% higher glucose conversion than two others.
Increase in Voltage Efficiency of Picoinjection using Microfluidic Picoinjector Combined Faraday Moat with Silver Nanoparticles Electrode
Noh, Young Moo ; Jin, Si Hyung ; Jeong, Seong-Geun ; Kim, Nam Young ; Rho, Changhyun ; Lee, Chang-Soo ;
Korean Chemical Engineering Research, volume 53, issue 4, 2015, Pages 472~477
DOI : 10.9713/kcer.2015.53.4.472
This study presents modified microfluidic picoinjector combined Faraday moat with silver nanoparticle electrode to increase electrical efficiency and fabrication yield. We perform simple dropping procedure of silver nanoparticles near the picoinjection channel, which solve complicate fabrication process of electrode deposition onto the microfluidic picoinjector. Based on this approach, the microfluidic picoinjector can be reliably operated at 180 V while conventional Faraday moat usually have performed above 260 V. Thus, we can reduce the operation voltage and increase safety. Furthermore, the microfluidic picoinjector is able to precisely control injection volume from 7.5 pL to 27.5 pL. We believe that the microfluidic picoinjector will be useful platform for microchemical reaction, biological assay, drug screening, cell culture device, and toxicology.
Effect of Reaction Factors on Reducing Sugar Production from Enteromorpha intestinalis Using Solid Acid Catalyst
Jeong, Gwi-Taek ; Park, Don-Hee ;
Korean Chemical Engineering Research, volume 53, issue 4, 2015, Pages 478~481
DOI : 10.9713/kcer.2015.53.4.478
In this study, the hydrolysis of green macro-algae Enteromorpha intestinalis using solid acid catalyst was conducted to obtain total reducing sugar. The hydrolysis was optimized with four reaction parameters of liquid-to-solid (L/S) ratio, catalyst amount, reaction temperature, and reaction time. As a optimized result, the highest TRS of 7.74 g/L was obtained under condition of 7.5 L/S ratio,
, 15% catalyst amount and 2 hr. By the way, at this condition, only 0.13 g/L 5-HMF was detected. The solid acid-catalyzed hydrolysis of marine resources had the potential in the field of bioenergy.
Experimental Evaluation Method of Mass Transfer Coefficient on Biotrickling Filtration for Air Pollution Control
Won, Yang-Soo ; Jo, Wan-Keun ;
Korean Chemical Engineering Research, volume 53, issue 4, 2015, Pages 482~488
DOI : 10.9713/kcer.2015.53.4.482
Biological treatment is promising alternative to conventional air pollution control method. Bioreactors for air pollution control have found most of their success in the treatment of dilute and high flow waste air streams containing volatile organic compounds and odor. The studies of mass transfer in biotrickling filters for air pollution control were of importance in order to control and optimize the purification process. The objectives of this study were to develop the experimental methodologies to evaluate the mass transfer coefficients of gas/liquid(trickling liquid), gas/solid(biomass) and liquid/solid in three phase biotrickling filtration. Also, this study characterized the influence factors on mass transfer such as dynamic holdup volume, gas/liquid flow rate ratio, biomass weight in reactor and recirculation rate of trickling medium for each phase of biotrickling filter.
Mass Transfer Model and Coefficient on Biotrickling Filtration for Air Pollution Control
Won, Yang-Soo ; Jo, Wan-Keun ;
Korean Chemical Engineering Research, volume 53, issue 4, 2015, Pages 489~495
DOI : 10.9713/kcer.2015.53.4.489
A fundamental mathematical model for mass transfer processes has been used to understand the air pollution control process in biotrickling filtration and to evaluate the mass transfer coefficients of gas/liquid (trickling liquid), gas/solid (biomass) and liquid/solid based upon experimental results and mathematical model calculations for selected operating conditions. The mass transfer models for the utilization of the steady-state mass balance for gas/liquid, and dynamic mass balance model for gas/solid & liquid/solid in biotrickling filters were established and discussed. The mass transfer model considered the reactor to comprise finite sections, for each of which dynamic mass balances for gas/solid and liquid/solid system were solved by numerical analysis code (numerical iteration). To determine the mass transfer coefficients (
) of gas/liquid, gas/solid & liquid/solid in a biotrickling filter, the calculation results based upon mass balance equation was optimized to coincide with the experimental results for the selected operating conditions. Finally, this study contributed the development of experimental methods and discussed the mathematical model to determine the mass transfer coefficients in a biotrickling filtration for air pollution control.
A Study on the Comparison of Methods for the Measurement of Hydrocarbon Dew Point of Natural Gas
Lee, Kang-Jin ; Ha, Young-Cheol ; Her, Jae-Young ; Woo, Jin-Chun ; Kim, Yong-Doo ; Bae, Hyun-Kil ;
Korean Chemical Engineering Research, volume 53, issue 4, 2015, Pages 496~502
DOI : 10.9713/kcer.2015.53.4.496
Hydrocarbon dew point(HCDP), a property which is the most generally used for describing natural gas condensation, is a very important parameter of natural gas quality specifications. HCDP is strongly influenced by the concentration of the heavier hydrocarbon components, especially
, so, along with compliance with gas quality specifications, build up of procedures for obtaining accurate HCDP is essential for gas transmission company, because hydrocarbon condensation present may cause serious operational and safety problems. This study has been carried out in an attempt to measure HCDP accurately by the automatic hydrocarbon dew point meter under the actual field conditions. Measured HCDP also has been compared with calculated HCDP using the composition determined by gas chromatograph and industry accepted equation of state at multiple pressures, along with the cricondentherm. The test results are 1) the automatic hydrocarbon dew point meter was able to measure stable HCDP continuously 2) the automatic hydrocarbon dew point meter has been performed reference measurement by pure propane with a known dew point from literature, and 3) A meaningful differences was observed when comparing the automatic hydrocarbon dew point meter and gas chromatograph results for synthetic standard gas mixtures and real gas mixtures.
Adsorption of Ammonia on Municipal Solid Waste Incinerator Bottom Ash Under the Landfill Circumstance
Yao, Jun ; Kong, Qingna ; Zhu, Huayue ; Zhang, Zhen ; Long, Yuyang ; Shen, Dongsheng ;
Korean Chemical Engineering Research, volume 53, issue 4, 2015, Pages 503~508
DOI : 10.9713/kcer.2015.53.4.503
The adsorption characteristics of ammonia on MSWI bottom ash were investigated. The effect of the variation of the landfill environmental parameters including pH, anions and organic matter on the adsorption process was discussed. Results showed that the adsorption could be well described by pseudo-second-order kinetics and Langmuir model, with a maximum adsorption capacity of 156.2 mg/g. The optimum adsorption of ammonia was observed when the pH was 6.0. High level of ion and organic matter could restrict the adsorption to a low level. The above results suggested that MSWI bottom ash could affect the migration of ammonia in the landfill, which is related to the variation of the landfill circumstance.
Reduction Leaching of Manganese Dioxide Ore Using Black Locust as Reductant in Sulfuric Acid Solution
Xue, Jianrong ; Zhong, Hong ; Wang, Shuai ; Li, Changxin ; Li, Jinzhong ; Wu, Fangfang ;
Korean Chemical Engineering Research, volume 53, issue 4, 2015, Pages 509~516
DOI : 10.9713/kcer.2015.53.4.509
We investigated the reduction leaching process of manganese dioxide ore using black locust as reductant in sulfuric acid solution. The effect of parameters on the leaching efficiency of manganese was the primary focus. Experimental results indicate that manganese leaching efficiency of 97.57% was achieved under the optimal conditions: weight ratio of black locust to manganese dioxide ore (WT) of 4:10, ore particle size of
, liquid to solid ratio (L/S) of 5:1, leaching time of 8 h, leaching temperature of 368 K and agitation rate of
. The leaching rate of manganese, based on the shrinking core model, was found to be controlled by inner diffusion through the ash/inert layer composed of associated minerals. The activation energy of reductive leaching is
. To conclude the reaction mechanism, XRD analysis of leached ore residue indicates manganese compounds disappear; FTIR characterization of leached residue of black locust sawdust shows hemicellulose and cellulose disappear after the leaching process.
Study on the Effects of Corrosion Inhibitor According to the Functional Groups for Cu Chemical Mechanical Polishing in Neutral Environment
Lee, Sang Won ; Kim, Jae Jeong ;
Korean Chemical Engineering Research, volume 53, issue 4, 2015, Pages 517~523
DOI : 10.9713/kcer.2015.53.4.517
As the aluminum (Al) metallization process was replaced with copper (Cu), the damascene process was introduced, which required the planarization step to eliminate over-deposited Cu with Chemical Mechanical Polishing (CMP) process. In this study, the verification of the corrosion inhibitors, one of the Cu CMP slurry components, was conducted to find out the tendency regarding the carboxyl and amino functional group in neutral environment. Through the results of etch rate, removal rate, and chemical ability of corrosion inhibitors based on 1H-1,2,4-triazole as the base-corrosion inhibitor, while the amine functional group presents high Cu etching ability, carboxyl functional group shows lower Cu etching ability than base-corrosion inhibitor which means that it increases passivation effect by making strong passivation layer. It implies that the corrosion inhibitor with amine functional group was proper to apply for 1st Cu CMP slurry owing to the high etch rate and with carboxyl functional group was favorable for the 2nd Cu CMP slurry due to the high Cu removal rate/dissolution rate ratio.
Optimization of Medium for Protease Production by Enterobacteriaceae sp. PAMC 25617 by Response Surface Methodology
Kim, Hyun-do ; Yun, Chul-Won ; Choi, Jong-il ; Han, Se Jong ;
Korean Chemical Engineering Research, volume 53, issue 4, 2015, Pages 524~529
DOI : 10.9713/kcer.2015.53.4.524
This study was conducted to optimize the medium composition for cold-adaptive protease production of Enterobacteriaceae sp. by response surface methodology (RSM). Yeast extract, and TritonX-100 were identified as the significant factors affecting protease from one-factor-at-a-time method. RSM studies for optimizing protease production of Enterobacteriaceae sp. have been carried out for three parameters including yeast extract concentration, TritonX-100 concentration, and culture pH. These significant factors were optimized as 6.690 g/L yeast extract, 0.018 g/L Triton
X-10, and pH 6.677. The experimentally obtained protease activity was 8.03 U /L, and it became 1.5-fold increase before optimization.