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REFERENCE LINKING PLATFORM OF KOREA S&T JOURNALS
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Applied Chemistry for Engineering
Journal Basic Information
Journal DOI :
The Korean Society of Industrial and Engineering Chemistry
Editor in Chief :
Volume & Issues
Volume 19, Issue 3 - Jun 2008
Volume 19, Issue 6 - 00 2008
Volume 19, Issue 5 - 00 2008
Volume 19, Issue 4 - 00 2008
Volume 19, Issue 2 - 00 2008
Volume 19, Issue 1 - 00 2008
Selecting the target year
Understanding Underlying Processes of Water Electrolysis
Lee, Jaeyoung ; Yi, Youngmi ; Uhm, Sunghyun ;
Applied Chemistry for Engineering, volume 19, issue 4, 2008, Pages 357~365
Hydrogen energy becomes more attractive in that it can resolve the exhaustion of fossil fuels and their environmental problems. Until now, water electrolysis has been a interesting technique to produce hydrogen from non-fossil fuels. In principle, water electrolysis is an environmentally friendly technique to split water into hydrogen and oxygen, so that it can be utilized without any limitation of resources. Herein, we introduce basic understanding and three types of water electrolysis. Furthermore, the research trend and patent analysis will be followed along with an outlook.
Removal of Total Phosphate by Bipolar Packed Bed Electrolytic Cell
Kim, Eun-Hee ; Park, Seung-Cho ;
Applied Chemistry for Engineering, volume 19, issue 4, 2008, Pages 366~369
To evaluate the performance of a bipolar packed bed cell (BPBC) filled with granular aluminium, the experiments were carried out in two groups as batch and continuous processes. In a batch process, removal efficiency of total phosphate (T-P) was 88% in case of electrolytic treatment of phosphate solution, T-P 10 mg/L at 6 V during 3 h by BPBC filled with granular aluminium. In a continuous process, residual T-P concentration was about 2 mg/L in case of electrolytic treatment of phosphate solution, 10 mg/L at 6 V, HRT 3 h by BPBC filled with granular aluminium. Break-through point was observed after running for 120 h at hydraulic retention time (HRT) of 3 h.
Optimum Condition for Non-Aqueous Dispersion Polymerization of Environmentally-friendly Acrylic Resin
Oh, Dae Geun ; Lee, Kyung Hoon ; Kim, Wan Tae ; Min, Byung Hoon ; Chung, Dae-won ; Lee, Jong Doo ; Kim, Jeong Ho ;
Applied Chemistry for Engineering, volume 19, issue 4, 2008, Pages 370~375
Optimum synthesis conditions were investigated for the non-aqueous dispersion (NAD) polymerization of environmentally-friendly acrylic resin. The optimum amount of stabilizer was observed to be 20 wt% to prevent flocculation of the synthesized polymer particles. The optimum ratio of aliphatic solvents to aromatic solvents turned out to be 80 to 20 in order to obtain a stabilized NAD resins. The viscosity of NAD resins was affected not only by the reaction time but also by the amount of initiator and the impeller rpm. Also, the particle size and the size distribution were influenced by the amount of stabilizers and initiators. Since the stability of NAD resin was devastated by the increase in particle size when all the monomers were fed at the beginning of polymerization, the monomers need to be put into the reactor step by step throughout the entire polymerization process.
A Study on the Deactivation of Commercial DeNOx Catalyst in Fired Power Plant
Park, Kwang Hee ; Lee, Jun Yub ; Hong, Sung Ho ; Choi, Sang Hyun ; Hong, Sung Chang ;
Applied Chemistry for Engineering, volume 19, issue 4, 2008, Pages 376~381
The deactivation of
catalyst used in SCR (Selective Catalytic Reduction) using ammonia as a reductant to remove the nitrogen oxides (NOx) in the exhaust gas from fired power plant has been studied. The activity and surface area of the catalyst (Used-cat) which was exposed to the exhaust gas for long period have considerably decreased. The characterizations of these SCR catalysts were performed by XRD, FT-IR, FE-SEM, and IC/ICP. The crystal structure of
both fresh and used catalyst has not been changed. However,
deposited on the used catalyst surface verified from FT-IR, FE-SEM, and IC/ICP analysis. Moreover, the durability of
was increased by diminishing sulfate (
Effect of Sealant Materials on Oxygen Permeation in Perovskite Oxide Membrane
Kim, Jong Pyo ; Park, Jung Hoon ; Yoon, Yeoil ;
Applied Chemistry for Engineering, volume 19, issue 4, 2008, Pages 382~387
oxide was synthesized by polymerized complex method. Dense membrane of perovskite oxide was prepared using as-prepared powder by pressing and sintering at
. Leakage test was conducted on the membrane sealed by gold ring, Pyrex ring or Pyrex powder as a sealing material. The oxygen permeation flux of
membrane increased with increasing temperature and was
. In the case of the membrane applied by sealing material, oxygen permeation flux of the membrane using gold ring at
was higher than that using Pyrex materials because the undesired spreading of Pyrex glass materials in the membrane led to the reduction of effective permeation area. Microphotograph analysis results for the membrane after permeation test confirmedthe diffusion of Pyrex glass seal into the membrane.
The Reactivity of Different Polyols for Paint to Polyisocyanate
Seo, Seok-Hwan ; Suh, Cha-Soo ; Park, Jin-Hwan ;
Applied Chemistry for Engineering, volume 19, issue 4, 2008, Pages 388~396
2 Components polyurethane coatings are widely used for the industrial coating in general because of its excellent film performance and the workability which were brought by the 3 dimensional cross linked chain structures being formed after the reaction between polyol and polyisocyanate. 2 components polyurethane can be classified into alkyd polyol, polyester polyol, acrylic polyol and polyester modified acrylic polyol depending on where it is used. This research was conducted under the conditions below; different chemical compositions of resin for paint, set the same conditions of viscosity, thinner and acid value, set alternative polyols, OH values and catalysts, set alternative polyisocyanate hardeners of the paint, measure the reaction rates and dynamic mechanical characteristics using RPT-3000, Rotation Rheometer, DMA and FTIR. The research found that the reactivity between polyol and isocyanate influences the film performance and workability depending on the catalysts, OH values and chemical compositions. We find out that different reaction rate of acrylic polyol and polyester modified acrylic polyol with poly-isocyanate is not influenced on temperature and catalyst. In addition, reaction speed of high hydroxyl content polyol is faster than low hydroxyl equivalent. These results can improve difficult working condition to apply urethane coating.
Modelling and Simulation on Non-isothermal Expansion of Water Oversaturated Perlite
Kim, Ji-Hwan ; Hahm, Yeong-Min ;
Applied Chemistry for Engineering, volume 19, issue 4, 2008, Pages 397~401
To verify model adaptation and flexibility, non-isothermal simulation for perlite expansion has been carried out. Temperature-dependent perlite properties are applied to energy equations for bubble temperature change and perlite melt temperature gradient. Bubble temperature is changed with volume change, water evaporation, and heat flux from melt. Temperature gradient of perlite melt is affected by decreasing bubble temperature. As a result, prediction model and code have been developed below 1100 K with 5% accuracy. At 1100~1400 K, lower 7% accuracy has been obtained from the calculation results.
Synthesis of Copolymers Composed of 1H,1H,2H,2H-perfluorodecylmethacrylate and tert-butylmethacrylate and Their Lithographic Properties in Carbon Dioxide
Hwang, Ha Soo ; Lee, Jin-kyun ; Park, In ; Huh, Hoon ; Lim, Kwon Taek ;
Applied Chemistry for Engineering, volume 19, issue 4, 2008, Pages 402~406
A series of random copolymers, composed of 1H,1H,2H,2H-perfluoro decyl methacrylate (FDMA) as a
-philic monomer and tert-butyl methacrylate (TBMA) as an acid labile monomer, were synthesized by free radical polymerization. The solubility of copolymers in carbon dioxide, light sensitivity at 365 nm exposure, and photoresist pattern formation properties were investigated. Furthermore, sub micron-sized poly(styrenesulfonate) : poly(3,4-ethylenedioxythiophene) (PSS : PEDOT) conducting polymer patterns were successfully prepared by pattern transfer.
Electrochemical Performances of Acid-Treated and Pyrolyzed Cokes According to Acid Treatment Time
Kim, Ick-Jun ; Yang, Sunhye ; Jeon, Min-Je ; Moon, Seong-In ; Kim, Hyun-Soo ;
Applied Chemistry for Engineering, volume 19, issue 4, 2008, Pages 407~412
As an activation procedure, in this study, the oxidation treatment of needle cokes with a dilute nitric acid and sodium chlorate
, combined with heat treatment, was attempted. The structures of acid-treated and pyrolyzed coke were examined with XRD, FESEM, elemental analyzer, BET, and Raman spectroscopy. The behavior of double layer capacitance was investigated with the analysis of charge and discharge. The structure of needle coke treated with acid was revealed to a single phase of (001) diffraction peak after 24 h. On the other hand, thecoke oxidized by heat treatment was reduced to a graphite structure of (002) at
. The distorted graphene layer structure, derived from the process of oxidation and reduction of the inter-layer, makes the pores by the electric field activation at the first charge, and generates the double layer capacitance from the second charge. The cell using pyrolyzed coke with 24 h acid treatment and
heat treatment exhibited the maximum capacitance per weight and volume of 33 F/g and 30 F/mL at the two-electrode system in the potential range of 0~2.5 V.
Study of Polycarbonate/MWNT Electrospun Nanofiber and Its Multi-Filament Application
Choi, Jae-Won ; Lee, Kwang-Hoon ; Hwang, Seok-Ho ; Kim, Jeong-Yeol ; Lee, Sang-Won ; Huh, Wansoo ;
Applied Chemistry for Engineering, volume 19, issue 4, 2008, Pages 413~420
Over the past decade, there have been significant advancement in the field of electrospinning area. This study has focused on preparing yarn using polycarbonate (PC) nanofibers including modified multi-walled carbon nanotube (mMWNT) by solution electrospinning process using the mixture of solvents consisting of tretrahydronfuran (THF) and N,N-dimethylformamide (DMF). In order to enhance the dispersion, MWNT was chemically modified. TEM analysis for the prepared PC/mMWNT nanofibers reveals that mMWNT was well-dispersed into the PC nanofiber matrix. Also with increasing contents of mMWNT, thermal stability of PC/mMWNT nanofibers was improved than that of PC nanofibers. Moreover when 3 to 5 wt% of mMWNT was added, the nanofibers showed good electrical properties expecting antistatic effect, ranging 109.1~109.5
. It was confirmed that the multi-filament fibers using PC/mMWNT had
in diameter and 4~5 cm in length.
Synthesis of Multi-Walled Carbon Nanotube/Polystyrene (MWCNT/PS) Composites by Solution Process and Their Thermal Behavior
Teng, Dayong ; Shin, Young Hwan ; Kwon, Younghwan ;
Applied Chemistry for Engineering, volume 19, issue 4, 2008, Pages 421~426
Multi-walled carbon nanotube/polystyrene (MWCNT/PS) composites with various MWCNT contents were prepared by using a solution process with an aid of surfactant. Particularly, PS's with 3 different molecular weights (
= 101500 g/mole for PS-1,
= 89900 g/mole for PS-2, and
= 85000 g/mole for PS-3) were used in this study. Thermal behavior of these composites was examined by using an oscillator rheometer at
, of above and below the critical flow temperature (
) of PS matrix, respectively. The storage and loss modulus, and the complex viscosity of these composites increased with increasing MWCNT content at both temperatures. Largest increases in the frequency-dependent moduli and complex viscosity were observed between 2 wt% and 5 wt% of MWCNTs at
. Only the composite at
showed the rheological phase transition from a viscous-dominant to an elastic-dominant behavior of the composites at a certain MWCNT content. The MWCNT content at the rheological phase transition of MWCNT/PS composites generally increased with decreasing molecular weight of PS, and was measured to be 3.5 wt% for MWCNT/PS-1, 3.2 wt% for MWCNT/PS-2, and 3.0 wt% for MWCNT/PS-3 composites.
Effect of Isocyanate Index on the Physical Properties of Rigid Polyurethane Foam under Sea Water
Kang, Sungkoo ; Cho, Ilsung ; Kim, Sangbum ;
Applied Chemistry for Engineering, volume 19, issue 4, 2008, Pages 427~431
The rigid polyurethane foams (PUF) were prepared using polyols with 90, 110, 130, and 150 isocyanate index. The effect of sea water on the physical properties of PUF with the increase in isocyanate (NCO) index and ageing time was investigated. Tensile strengths and compressive strengths of the PUFs decreased up to 10% and 7% with an increase in ageing time, respectively. Cell morphology of the PUF under sea water was turned out to be the same as that in the ambient condition. It was observed that
and tensile modulus of the PUF under sea water increased. The results showed an additional cross-link reaction of non-reacted MDI and the change of NCO peak as observed from FT-IR spectrum.
Optimization of Process Variables in the Hydrogenation of p-Toluidine on Ru/C Catalyst
Hong, Bum-eui ; Lee, Jong-min ; Park, Yeung-ho ;
Applied Chemistry for Engineering, volume 19, issue 4, 2008, Pages 432~438
Hydrogenation reactions of p-toluidine over Ru/C were performed while varying reaction temperature, the hydrogen pressure, catalyst loading, solvent, and alkali additive and the effects on the reaction rates and product distribution were examined. 4-Methylcyclohexylamine was generated as a main product and bis(4-methyl cyclohexyl)amine was obtained as a resentative side-product for the hydrogenation reaction of p-toluidine. The selectivity of MCHA decreased with reaction temperature and the hydrogen pressure while increased with catalyst loading. IPA was the best solvent for MCHA. A mechanism of hydrogenation reaction of p-toluidine was suggested from the results. It was found that the presence of alkali salt increased MCHA by reducing BMCHA and rates of hydrogen reaction increased.
Adsorption Characteristics of Oyster Shell using Activation Process
Lee, Seung-Bum ; Hong, In-Kwon ;
Applied Chemistry for Engineering, volume 19, issue 4, 2008, Pages 439~444
The oyster shell adsorbents were prepared by steam activation method to evaluate their adsorption characteristics. Washed and pulverized waste oyster shells were prepared by steam activated process in converter at the temperature range of about
after carbonized at the range of
. The shell carbonized at
showed the best performance among those of other temperature ranges. Also, comparison between gas and liquid phase adsorption was performed to verify adsorbent possibility of waste shell. In case of gas phase, the adsorbent showed lower performance than existing commercial adsorbents. On the other hand, the liquid phase, they showed similar adsorption performance to commercial adsorbents when benzene was used.
A Study on Adsorption Characteristics of Benzene over Activated Carbons Coated with Insulating Materials and Desorption by Microwave Irradiation
Kim, Ki-Joong ; Ahn, Ho-Geun ;
Applied Chemistry for Engineering, volume 19, issue 4, 2008, Pages 445~451
In order to regenerate the activated carbon polluted by volatile organic compounds (VOCs) using microwave, adsorption and desorption characteristics of benzene over activated carbon (AC) coated with insulating materials were investigated. Physical characteristics of activated carbon and insulator-coated ACs were investigated by means of
gas adsorption and scanning electron microscopy (SEM). The amount of VOC adsorbed showed a positive relationship with the specific surface area of the ACs, and spark discharge over insulator-coated ACs did not occur. Potassium silicate (PS) was the best binder for coating of insulating materials on AC. Amount of benzene desorbed by microwave irradiation was dependent on output power of microwave. Nearly same performance was obtained even though the adsorption-desorption operation under microwave irradiation was repeated 5 times. Finally, it was known that the microwave heating was a very effective mean for regenerating the polluted AC.
Adsorption of Gaseous Benzene onto Mesoporous Silicates
Lee, Chae Young ; Moon, Nam Gu ; Chung, Jin Suk ; Shin, Eun Woo ;
Applied Chemistry for Engineering, volume 19, issue 4, 2008, Pages 452~456
Mesoporous silicate materials have been used as adsorbents due to the advantage of high specific surface area and regular mesopores. In this study, conventional mesoporous silicates (MCM-41, and SBA-15) were utilized as adsorbents for gaseous benzene, one of volatile organic compounds. In the results of the breakthrough curves of gaseous benzene, SBA-15 showed a higher benzene adsorption capacity in adsorption condition of this study. Especially, compared to benzene adsorption of zeolite X, that of SBA-15 was higher by a factor of 2.7. With increasing adsorption temperature, adsorption capacity for benzene of SBA-15 was decreased rapidly. This indicates that benzene adsorbed weakly on SBA-15.