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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 :
Volume & Issues
Volume 33, Issue 6 - Dec 1995
Volume 33, Issue 5 - Oct 1995
Volume 33, Issue 4 - Aug 1995
Volume 33, Issue 3 - Jun 1995
Volume 33, Issue 2 - Apr 1995
Volume 33, Issue 1 - Feb 1995
Selecting the target year
Kinetics of Titanium Tetraisopropoxide Pyrolysis
Moon, Won-Seok ; Kim, Ki-Young ; Park, Seung-Bin ;
Korean Chemical Engineering Research, volume 33, issue 4, 1995, Pages 399~399
Pyrolysis of titanium tetraisopropoxide(TTIP) was studied using batch-type reactor coated with
. The reaction temperatures were 240, 270, 290,
and the initial concentration of TTIP was
. The contribution of heterogeneous reaction to the pyrolysis of TTIP was more significant than homogeneous one in the experimental range and the thermal decomposition of TTIP was catalysed by
coated on reactor surface. Inert gases(Ar, He,
) which were used as reaction atmosphere had no effect on reaction path or rate of reaction. The reaction was first order with respect to TTIP and the rate limiting step was the adsorption of TTIP on
coated reactor wall. The rate equation obtained from the batch-type reactor predicts reasonably the final conversion of the flow reactor.
Salt Effect in Liquid-Liquid Equilibrium for Solvent-Water-Acetonitrile System
Lee, Jin-Woo ; Seo, Jin-Gi ; Park, Dong-Won ;
Korean Chemical Engineering Research, volume 33, issue 4, 1995, Pages 407~407
In the process of manufacturing acrylonitrile, azeotrope of acetonitrile-water was come into being as by-product. Benzene, toluene, o-xylene, ethylacetate and monochlorobenzene as solvents were selected in order to determine the liquid-liquid equilibria for solvent(1)-water(2)-acetonitrile(3) and solvent(1)-halogen salt solution(2)-acetonitrile(3) systems. The consistency test for the experimental data was investigated using several correlations. The experimental tie line data were correlated with the NRTL, UNIQUAC and modified UNIQUAC models. The parameters contained in these models were determined. The salt effect on liquid-liquid equilibrium was also studied.
Optical Recording Media via Charge Transfer Polymer Complex
Kim, Jong-Sung ; Park, Kyung-Yoon ;
Korean Chemical Engineering Research, volume 33, issue 4, 1995, Pages 422~422
Polymers(polycations) instead of metals were used as the electron donor, and polymer-TCNQ(tetracyanoquinodimethane) charge transfer complexes were synthesized. These charge transfer complexes were tested whether they can be used as the optical recording media. 2,6-Ionene-TCNQ has the cations in the main chain of the polymers, while poly (1-butyl-4-vinylpyridinium-TCNQ) and poly(styrene co 1-butyl-2-vinylpyridinium-TCNQ) have cations in the side chain of the polymers. The side chain polymers were soluble in organic solvents and spin coatable. They were spin coated on the polycarbonate substrate with the aluminium reflective layer and tested by commercial optical recording media evaluation system. The maximum 40 dB of CNR(carrier to noise ratio)was observed with the writing power of 8.9 mV and writing velocity of 1.2 m/s.
Temperature-Programmed Desorption of Thiophene and Hydrogensulfide over Carbon-supported Co-Mo Catalysts
Ihm, Chang-Do ; Moon, Young-Hwan ; Moon, Sang-Jin ; Kim, Do-Woan ; Ihm, Son-Ki ; Park, Seung-Bin ;
Korean Chemical Engineering Research, volume 33, issue 4, 1995, Pages 428~428
Temperature-programmed desorption(TPD) was carried out over the sulfided Mo/C, Co/C and Co-Mo/C catalysts, and heats of adsorption of thiophene and hydrogensulfide were obtained from TPD spectra by varying heating rate. It was studied the relationship between these heats of adsorption and the activity for hydrodesulfurization(HDS) of thiophene which was measured in a microflow reactor at atmospheric pressure and
. The synergistic HDS activity was well explained by correlating it with the difference in heat of adsorption between thiophene and hydrogensulfide.
The Preparation of Zinc Oxide Fine Particles by Homogeneous Precipitation Method
Ju, Chang-Sik ; Lee, Hwae-Gyon ; Jeong, Yong-Ok ; Chun, Jae-Ki ; Hwang, Duk-Ki ;
Korean Chemical Engineering Research, volume 33, issue 4, 1995, Pages 437~437
Zinc oxide fine particles were prepared from aqueous solutions of zinc nitrate in the presence of hexamethylenetetramine by homogeneous precipitation method. The rate of conversion change and the equilibrium conversion of zinc increased with the increase in R values and temperature, and with the decrease in initial pH of the solutions but initial concentration of zinc had only minor effect on them. Various shapes of zinc oxide fine particles were formed in relation to the precipitation conditions such as, concentrations of zinc nitrate and hexamethylenetetramine, temperature, pH of initial solution and aging time. The initial microcrystalline particles are approximately spherical with an average size of
, but they formed embryonic particles by coupling together and grew up. Spherical particles with a relatively narrow size distribution could be obtained when the concentration of zinc ion and R value were both high.
Effect of Quinoline Entrainer in Fractionation of Pitch with Supercritical Toluene
Kim, Cheol-Joong ; Ryu, Seung-Kon ; Rhee, Bo-Sung ; Hwang, Jong-Sic ;
Korean Chemical Engineering Research, volume 33, issue 4, 1995, Pages 445~445
Effects of quinoline entrainer content, extraction temperature and pressure in fractionation of pitch with supercritical toluene is investigated. Quinoline contents 0, 3, 7, 10%, temperatures 325, 345,
and pressures 27, 47, 67.2 bar were selected as experimental conditions. The addition of quinoline made the solubility of pitch increase and made changes on extraction selectivity. Furthermore, it was effective on the formation of fusible mesophase pitch. So, it is anticipated that the mesophase pitch could be used as the precursor for the formation of a high-performance pitch-based carbon fiber.
Seasonal Variation of Tensile Properties and Morphology of Starch-Calcium Carbonate-HDPE Composite Film
Shin, Yong-Sub ; Lee, Hoon-Bok ; Shin, Boo-Young ;
Korean Chemical Engineering Research, volume 33, issue 4, 1995, Pages 452~452
Degradable master batch(M/B) was prepared using mechanical oxidation during melt mixing process with high shear and under the presence of air. High density polyethylene(HDPE) thin film containing 40wt% of degradable M/B was prepared by inflation film processing. The degradation of thin film has been studied with thermal aging in air environment at
, UV aging in an artificial weather-O-meter, outdoor exposure and water soaking aging at
. Seasonal effect was examined by the loss of tensile properties and by morphology change obtained with scanning electron microscopy(SEM). The effect of water on UV degradation was examined by an artificial weather-O-meter. It was noted that water affects the UV degradation of film. The decrease of tensile properties in summer was observed to be faster than that of the other seasons.
Decomposition of Dimethyl Methylphosphonate over the Alumina-Supported Precious Metal Catalysts
Ryu, Sam-Gon ; Yang, Jae-Kyu ; Lee, Hae-Wan ; Yang, Yong-Sik ;
Korean Chemical Engineering Research, volume 33, issue 4, 1995, Pages 462~462
The catalytic decomposition of vaporized dimethyl methylphosphonate(DMMP) by alumina-supported precious metal catalysts was studied with a fixed bed flow reactor. The platinum catalyst showed the best performance for the reaction. DMMP vapor in air stream was decomposed perfectly at the beginning but the performances of the catalysts were reduced rapidly with the lapse of time. So we tried to elucidate the decomposition mechanism of DMMP and the deactivation mechanism of the catalysts in process of reaction by analyzing the reaction products and the surfaces of the catalysts. According to the test results, methoxy groups of DMMP were separated by hydrolysis reaction over the alumina support, and the methanol formed from the methoxy groups was decomposed to carbon dioxide and water by oxidation reaction over the precious metals. The decomposed chemicals containing phosphorous were mainly nonvolatile monomethyl methylphosphonate(MMMP) and methylphosphonic acid(MPA). A part of the nonvolatile products adhered strongly to the surfaces of the catalysts, so the catalysts were deactivated seriously.
A Study on the Relationship between Current and Voltage in Electrodialyzer
Kim, In-Ho ;
Korean Chemical Engineering Research, volume 33, issue 4, 1995, Pages 471~471
Ionic mass transport in electrodialysis was modelled to describe current-voltage characteristics. Modelling equations were checked by the experiments conducted with a laboratory electrodialyzer. Sodium chloride solution was supplied to the dialyzer where current-voltage curves were generated. Limiting current density was increased with the increase of flow rate, which was also predicted by the model equations.
Numerical Modeling of Effects of Operating Variables of MCFC on the Cell Performance and Comparisons with Experimental Data
Ahn, Young-Joo ; Chung, Gui-Yung ; Ju, Jae-Back ; Nam, Suk-Woo ; Oh, In-Hwan ; Lim, Tae-Hoon ; Hong, Seong-Ahn ;
Korean Chemical Engineering Research, volume 33, issue 4, 1995, Pages 479~479
A mathematical model is proposed to simulate the effect of variables on cell performances of molten carbonate unit fuel cell at the constant temperature. Values of the total cell resistance calculated with twice of the Arrhenius constant in the equation of anode resistance, presented in the reference, agreed well with experimental data. On the basis of these results, numerical calculations of the effects of current density, the gas utilization(i.e. flow rate), gas compositions, and cell temperature on the cell performances were compared with experimental data. At the constant temperature, numerical calculations of the effects of operating variables on the cell performances, such as voltage and power, were agreed well with experimental data.
A Study on the Isothermal Vapor-liquid Equilibria of the Alcohol(
)+ TEOS Mixtures
Oh, Jong-Hyeog ; Park, So-Jin ; Do, Mi-Seon ; Rho, Jae-Seong ;
Korean Chemical Engineering Research, volume 33, issue 4, 1995, Pages 488~488
Isothermal vapor-liquid equilibrium(VLE) data were measured at
by means of the head space gas chromatography (H.S.G.C) method, one of the static methods, for alcohol (
)+TEOS mixtures. All the experimental vapor-liquid equilibrium(VLE) data had no azeotropes and showed positive deviation from the Raoult's law. The positive deviations decreased with the increase of the chain length of alcohols. VLE data were correlated with conventional
models and deviations were found less than 1%.
A Study on Syntheses and Photophysical Properties of Spiroindolinonaphthoxazine Dye
Lee, Tae-Jin ; Choi, Jong-Eon ; Kim, Jang-Hee ; Kim, Ki-Seok ; Kim, Jae-Chang ; Kim, Dong-Hyun ;
Korean Chemical Engineering Research, volume 33, issue 4, 1995, Pages 497~497
Photochromic spiroindolinonaphthoxazine dye was synthesized via condensation of 1,3,3-trimethyl-2-methylene indoline with 1-nitroso-2-naphthol. Spiroindolinonaphtoxazine prepared was characterized by means of TLC, melting point measurement, UV, IR,
, and elemental analysis. Photophysical properties of spiroindolinonaphthoxazine were investigated using UV-visible spectrophotometer. The colorless form and the colored metastable form in ethanol solution exhibited unique characteristic bands respectively. A thermal equilibrium existed between the colorless and colored forms, and the standard enthalpy of equilibrium could be obtained from the measurement of absorbance of the colored form at different temperatures. Catalytic condensation reactions were conducted on various catalysts in order to improve the yield of spiroindolinonaphthoxazine. 5wt% Pd/C catalyst resulted in the yield about two times higher than that for noncatalytic condensation. which suggests the possibility of improvement in spiroindolinonaphthoxazine yield by the catalytic process.
Vapor-Liquid Equilibrium of
-Methanol-Ethanol Systems at 303.15K
Oh, Seung-Kyo ; Campbell, Scott W. ;
Korean Chemical Engineering Research, volume 33, issue 4, 1995, Pages 503~503
The behavior of vapor-liquid equilibrium for copper(II) chloride-methanol-ethanol at 303.15K is presented by reporting the total pressure as a function of liquid phase composition. Pressure was measured as a function of salt concentration along various lines of essentially constant methanol mole fraction(on a salt-free basis). The data were reduced by Barker's method with extended fits using an empirical expression for the excess Gibbs energy of the liquid phase. Vapor phase compositions calculated for the two alcohols indicate that the vapor phase mole fraction of ethanol is increased(ethanol is salted out)by addition of copper(II) chloride to liquid mixtures of methanol and ethanol. Based on given solvent composition, the total pressures of the ternary mixture decrease regularly with increasing salt concentration. Increased vapor pressure depression effects correspond to increased salt solubilities in a mixed solvent.
Preparation of a Titanium Silicalite I Catalyst and Its Liquid Phase n-Hexane Oxidation Characteristics
Kim, Jung-Kyu ; Ko, Yong-Sik ; Kim, Tae-Jin ; Ahn, Wha-Seung ;
Korean Chemical Engineering Research, volume 33, issue 4, 1995, Pages 511~511
Titanium silicalite 1 catalysts were prepared using various hydrothermal synthesis methods and the effects of synthesis parameters on the catalyst morphology were investigated. XRD, SEM, IR,
MAS NMR, UV-VIS DRS, and EXAFS analysis were then performed to evaluate its physico-chemical properties. For its catalytic property study, liquid phase n-hexane oxidation using
as an oxidant was carried out. It was established that an adequate amount of TPAOH, alkoxide silicon source, continuous water replenishment during the hydrolysis process and fast heating of the hydrothermal reactor vessel are necessary in order to obtain small zeolite crystals. In the n-hexane oxidation, 2,3-hexanol and 2,3-hexanone were produced via successive oxidation sequences, and 2-hexanol was found to be more quickly oxidized to ketone than 3-hexanol. Methanol and acetone were superior as a solvent, and under non-excess solvent condition, n-hexane/
mole ratio of 2 was found adequate for the better conversion.
Measurements of IR Attenuation by Suspended Particles Using IR Spectrometer
Choi, Ki-Bong ; Goh, Eun-Mee ; Ahn, Kyung-Il ;
Korean Chemical Engineering Research, volume 33, issue 4, 1995, Pages 521~521
To examine the correlationship between IR attenuation and physical properties of suspended particles, IR spectrometer can be used effectively. Several graphite flakes and metallic powders were suspended in a liquid cell and the IR attenuations were measured. The results were analyzed in terms of their physical properties such as shape, purity and mean particle size. It was found out that the powder which had smaller mean size, higher purity and more developed flake type showed higher IR attenuation. JG02 and BR06 showed the highest mass and volume extinction coefficient,
, respectively. This technique was considered as more efficient method than the conventional one using aerosol chamber. It could reduce the error caused by external factors and was even more simple to measure the physical effects of various kinds of suspended powders.