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REFERENCE LINKING PLATFORM OF KOREA S&T JOURNALS
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Korean Chemical Engineering Research
Journal Basic Information
Journal DOI :
The Korean Institute of Chemical Engineers
Editor in Chief :
Volume & Issues
Volume 30, Issue 6 - Dec 1992
Volume 30, Issue 5 - Oct 1992
Volume 30, Issue 4 - Aug 1992
Volume 30, Issue 3 - Jun 1992
Volume 30, Issue 2 - Apr 1992
Volume 30, Issue 1 - Feb 1992
Selecting the target year
Optimization of an Extractive Distillation System
Han, Myung-Wan ; Kim, Hee-Young ; Park, Sun-Won ;
Korean Chemical Engineering Research, volume 30, issue 5, 1992, Pages 517~517
An optimization problem for an extractive distillation system composed of one extractive distillation column and one stripping column was formulated. Tray efficiency of each column was determined by experiments for the separation of ethanol-water mixture where ethylene glycol was used as an extractive solvent. Optimization was then performed to find optimum operating condition using a steady-state rigorous model. Three optimization algorithms were tested to find the most effective algorithm for this system. An objective function was established in terms of heat balance, make up of the extractive solvent, and overhead product. The proposed optimization procedure yielded effectively not only the dependence of the objective function upon the operation parameters but also, within given constraint regime, an optimum operating condition for an extractive distillation process.
Leakage Detection of Pipeline System Based on Modeling and Identification
Lee, Joo-Hyeong ; Yeo, Yeong-Koo ; Song, Hyung-Keun ; Lee, Kwang-Soon ;
Korean Chemical Engineering Research, volume 30, issue 5, 1992, Pages 526~526
A leakage detection method based on a physical model of a pipeline system is proposed. Based on fundamental balance equations for liquid transporation in a pipeline, the method was constructed to diagnose the leak point as well as to detect the leakage. The proposed method was evaluated in a water transporting pipeline system of which the length is 97.6m and inner diameter is 3/8", respectively. As a result, the method could discriminate the leakage whenever the leaking rate is more than 3% of the total flowrate and localize the leaking point within 3% of accuracy depend on the leaking rate.
Usefulness of Heat Exchanger Network Synthesized by Minimization of Exergy Loss
Joo, Hyun-Soo ; Choi, Chang-Kyun ; Kim, Hwa-Yong ;
Korean Chemical Engineering Research, volume 30, issue 5, 1992, Pages 537~537
In the present study the heat exchanger network is synthesized by the design method in which the exergy analysis is incorporated with the pinch technology. The present synthesis method is applied to the existent five problems of heat exchanger network. Our method employing the minimum number of heat exchange units under the maximum energy recovery condition looks very reasonable even in view of the number of shells and also the area of heat exchangers in comparison with results in recent publications. It is shown that the present method brings the removal of 4 shells in one problem and in other three problems it produces almost the same heat exchange areas as those from the previous methods. Therefore it is thought that the present synthesis method can be used efficiently for the basic design to synthesize and also improve heat exchanger networks.
The Measurements of Thermal Plasma Temperature and Velocity by a Calorimetric Probe
Kim, Joo-Chan ; Park, Dong-Wha ;
Korean Chemical Engineering Research, volume 30, issue 5, 1992, Pages 547~547
The purpose of this study is to suggest a measuring technique of plasma jet temperature and velocity using an relatively economic apparatus. Argon gas was used as a plasma source. Temperature and velocity of the plasma discharged into air through the anode nozzle was measured. Plasma temperature was obtained by measuring enthalpy which was transferred from plasma to water in a water-cooled probe. The plasma velocity was obtained by measuring the dynamic pressure of the plasma by using the same water-cooled probe. Axial and radial distributions of temperature and velocity were also obtained. The validity of the measured enthalpy and velocity profiles has been confirmed by performing mass and energy balances, which show reasonable agreements between the quantities used and those obtained by integrating over the experimental data.
VLE for the Systems Water-Ethylene Glycol, Methanol-Ethylene Glycol and Pentanol-Ethylene Glycol
Lee, Hyun-Song ; Yoon, Ji-Ho ; Lee, Huen ;
Korean Chemical Engineering Research, volume 30, issue 5, 1992, Pages 553~553
Isobaric vapor-liquid equilibria for the three binary systems water-ethylene glycol, methanol-ethylene glycol and pentanol-ethylene glycol were measured at
by using a vapor recirculatory still. The experimental data were correlated with the Wilson, UNIQUAC and NRTL equations.
Saccharification of Lignocellulose and Ethanol Fermentation by Immobilized Yeast
Cho, Hang-Shin ; Kim, Seung-Wook ; Hong, Suk-In ;
Korean Chemical Engineering Research, volume 30, issue 5, 1992, Pages 559~559
The conversion of cellulose and lignocellulose such as Solka floc BW 200 and waste paper into ethanol using Trichoderma reesei cellulase and immobilized yeast was investigated. The object of this study is to decrease the product inhibition by performing simultaneous saccharification and fermentation(SSF), and is to control the biochemical metabolism of immobilized yeast by using fluidized-bed reactor, thus producing high productivity of ethanol. When the yeast was inoculated after 30 hours of the saccharification process, glucose concentration was increased temporarily after 1hour of SSF and decreased rapidly by ethanol fermentation. And it was found that the saccharification was inhibited by the addition of glucose or ethanol. Fed-batch or semi-batch fermentation in the fluidized-bed reactor was more favorable than batch fermentation for ethanol production.
Effects of Air and Water Vapor on the Synthesis of Pyridine from Acrolein and Ammonia
Oh, Seok-Youn ; Choi, Jung-Kun ; Park, Dae-Won ;
Korean Chemical Engineering Research, volume 30, issue 5, 1992, Pages 564~564
Steady and unsteady state operations for the synthesis of pyridine and
were carried out with a
catalyst. Addition of small amount of air and water vapor increased yield of pyridine and
but the catalyst was deactivated when they were used in excess. Periodic reactivation of the catalyst with air showed higher yield of pyridine compared to steady-state operation.
A Study of CO Oxidation Reaction Using Catalytic Wall Reactor
Park, Seung-Doo ; Lee, In-Wha ; Choi, Myoung-Jai ; Hong, Suk-In ;
Korean Chemical Engineering Research, volume 30, issue 5, 1992, Pages 571~571
The layer of alumina was formed in the inside of the aluminum tube by anodic oxidation, and Pt, Pd catalysts were impregnated on the alumina layer to make catalytic wall reactor. The CO oxidation reaction was investigated for the performance of this reactor as the model reaction. By controlling of the anodizing conditions, the extent of impregnation could be regulated. And by controlling the lengths of reactors, the conversion of over 90% could be obtained. A new empirical equation which was good consistent with the results was suggested by modifying the Senkan's equation.
Enthalpy of Mixing for Acetone-Ethanol-Water Ternary Liquid Mixtures
Byun, Hun-Soo ; Suh, Hong-Sam ; Kwak, Chul ;
Korean Chemical Engineering Research, volume 30, issue 5, 1992, Pages 578~578
The enthalpies of mixing for the binary systems of acetone-ethanol, acetone-water and ethanol water and for the corresponding ternary liquid system of acetone-ethanol-water were measured at 298.2K. The ternary enthalpies of mixing were estimated from the results of tree binary systems by the wilson equation and the NRTL equation, and the predicted values were found to be in a good agreement with the experimental data.
Structure and Thermal Properties of Chromium Oxide Supported on Zirconia
Sohn, Jong-Rack ; Ryu, Sam-Gon ; Pae, Young-Il ;
Korean Chemical Engineering Research, volume 30, issue 5, 1992, Pages 586~586
Chromium oxide/zirconia catalysts were prepared by dry impregnation of powdered
with aqueous solution of
followed by calcining in air. The structures and thermal properties of prepared catalysts were investigated using XRD and DT-TGA. On the basis of the results obtained from X-ray diffraction and DTA for chromium oxide/zirconia, it was suggested that the presence of chromium oxide delayed the transitions of zirconia from amorphous to tetragonal phase and from tetragonal to monoclinic phase in proportion to the chromium oxide content. Chromium oxide was well dispersed on the surface of zirconia due to the strong interaction between chromium oxide and zirconia, and consequently
crystalline was observed only at calcination temperature above
Analysis of Fluid-Solid System in a Fixed-Bed by Finite Element Method Using Mixed Coordinate -I. Numerical Simulation of a Fixed-Bed Adsorption Column-
Park, Pan-Wook ; Kim, In-Sil ; Cho, Tae-Je ; JeongPark, Yong-Ok ;
Korean Chemical Engineering Research, volume 30, issue 5, 1992, Pages 594~594
The Finite Element Method(FEM) was formulated for numerical solution of a fixed-bed adsorption column using mixed coordinate system which consists of a cylindrical and spherical coordinates. The mixed coordinate system is implemented by connecting of interfacial resistances between two coordinates. The breakthrough curves for three Peclet numbers are simulated and then compared with an exact analytic solution. The finite element solution obtained by adopting the Dirichlet boundary conditions as the inlet gives larger disagreements with an exact analytic solution. The merit of the Danckwerts boundary condition is that it prohibits the diffusion flux at the boundary even though the system is diffusion dominated. The larger disagreements in solutions especially when the Peclet number is small might be caused by the diffusion flux at the inlet. The simulation results agree good with analytical solutions for three different Peclet numbers.
Analysis of Dispersion Behavior of Fluidized Particles by Relaxation Method in Fluidized Beds with Non-Newtonian Fluid
Kang, Yong ; Nah, Jong-Bok ; Choi, Sang-Won ; Kim, Sang-Done ;
Korean Chemical Engineering Research, volume 30, issue 5, 1992, Pages 605~605
Frequency and axial dispersion coefficient of fluidized particles in fluidized beds with non-Newtonian fluid(coal-CMC solution) were measured by means of relaxation method. Effects of fluid flow rate, liquid viscosity, fluidized particles size and bed porosity on the dispersion coefficient of fluidized particles were determined. Effects of the injection of small amount of gas into the fluidized beds with non-Newtonian fluid on the dispersion coefficient of fluidized particles were also discussed. From the results of this study, the frequency and dispersion coefficient of fluidized particles exhibited their maxima with increases in fluid flow rate and bed porosity, and those values increased with increases in particles size and liquid viscosity. The injection of small amount of gas into the liquid-solid fluidized beds could increase the frequency and dispersion coefficient of fluidzed particles.
The Distribution, Dissociation Equilibria and Mass Transfer of Aliquat 336
Park, Sang-Wook ; Moon, Jin-Bok ; Park, Dae-Won ; Shin, Jeung-Ho ;
Korean Chemical Engineering Research, volume 30, issue 5, 1992, Pages 612~612
The distribution and dissociation equilibria of tricaprylmethyl ammonium chloride(Aliquat 336;
) were measured for the system of organic phase(toluene, n-butyl acetate)-aqueous phase(water, NaCl, NaOH,
). The enhancement factors of
were measured with a Lewis cell, and compared with those predicted from the theoretical model based on the film theory corrected by the Leveque model. The aqueous-phase mass transfer of
in the toluene-water system and toluene-NaOH aqueous solution system could be quantitatively explained as that with an instantaneous reversible dissociation reaction.
Salt Effect in Liquid-Liquid Equilibrium for Ternary Systems with Solvent-Water-Pyridine
Seo, Jin-Gi ; Lee, Jin-Woo ; Park, Dong-Won ;
Korean Chemical Engineering Research, volume 30, issue 5, 1992, Pages 622~622
The experimental binodal curves and tie lines were determined for solvent-NaCl salt solution-pyridine systems at
, and those tie line data were used to test thermodynamic consistency. The NaCl salt solutions were prepared with aqueous solution of 5%, 10% and 15% NaCl salts respectively. The experimental tie line data were correlated with the NRTL model, and the parameters and the calculated values of tie line were predicted. The effect of salt addition on liquid-liquid equilibria was also studied along with the increment of salt concentration.
Improved Method for a PID Controller Tuning by the Dominant Pole Placement
Lee, Jie-Tae ; Choi, Jin-Young ; Lee, Sang-Deuk ; Kwon, Young-Soo ;
Korean Chemical Engineering Research, volume 30, issue 5, 1992, Pages 631~631
A simple method tuning the classical PID controller and a recent PID controller with 2 degree of freedom has proposed. Some simulations showed that the proposed method improves the slow load responses of the IMC method.