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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
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Volume & Issues
Volume 26, Issue 6 - Dec 1988
Volume 26, Issue 5 - Oct 1988
Volume 26, Issue 4 - Aug 1988
Volume 26, Issue 3 - Jun 1988
Volume 26, Issue 2 - Apr 1988
Volume 26, Issue 1 - Feb 1988
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Real-Time Prediction of Hot Metal Temperature in a Blast Furnace Using an ARMAX Model
Choi, Tae-Wha ; Lee, Il-Ok ; Lee, Kwang-Soon ; Kim, Ki-Byung ;
Korean Chemical Engineering Research, volume 26, issue 3, 1988, Pages 237~237
A method to predict real-time temperature of hot metal in an industrial blast furnace is proposed by using an ARMAX model combined with recursive parameter identification techniques. To apply this method to real blast furnace operating data, 12 operating variables which have significant effects on the hot metal temperature were chosen first through correlation analysis. Then four recursive identification techniques of RLS, RIV, RML, and RELS were tested and compared for estimation of parameters in the ARMAX model. Through this work, it was found that the ARMAX model combined with recursive parameter identification techniques is very useful for prediction of the hot metal temperature in real-time.
Effect of Cooling Surface on the Crystallization Kinetics in an MSMPR Crystallizer
Yang, Kee-Yong ; Kim, Ho-Dong ; Lee, Chul-Soo ;
Korean Chemical Engineering Research, volume 26, issue 3, 1988, Pages 245~245
Effect of cooling surface temperature on the crystallization kinetics in MSMPR crystallizers was experimentally investigated. The temperature difference between the bulk and the cooling surface was found to have significant effects on the crystal growth. An empirical correlation was proposed to account for such effect.
Effects of Different Sources and Properties of Silica Raw Materials on the Crystallization of NaA, NaY, Na-Mordenite and ZSM-5
Kim, Geon-Joong ; Jung, Sang-Jin ; Kim, Tae-Joon ; Kwon, Lee-Mook ;
Korean Chemical Engineering Research, volume 26, issue 3, 1988, Pages 251~251
NaA, NaY, Na-Mordenite and ZSM-5 type zeolites were synthesized using fine silica powder of Zeosil 77 and sodium silicate solution as the silica sources, and the effects of starting raw materials, aging, and reaction time on the crystallization rates and crystallinities for those zeolites were investigated. For NaA, NaY and ZSM-5, aging about 1 day at room temperature was essential, but it showed a negative effect for Na-Mordenite synthesis. Whilst these precursors, such as secondary building unit and nuclei of zeolites, were believed to form in the aging step at room temperature for A, Y and ZSM-5 type zeolite, the nuclei of Na-Mordenite were formed, with silica as core, during hydrothermal reaction at higher temperature. The effects of silica sources on the crystallization showed different results depending on the zeolite types. While higher crystallinity and faster reaction rates were obtained using Zeosil alone as the silica source for Na-Mordenite, for ZSM-5 superior crystallization was resulted when sodium silicate solution was used in conjunction with Zeosil. It is believed that
reacts more easily with silicate or aluminosilicate ions, and effectively promotes the structure directing role in the crystallization of ZSM-5 than with fine silica particles. When the Zeosil was added to sodium silicate solution to achieve the necessary silica content of the substrates, the rates of crystallization and crystallinity of NaA, NaY and Na-Mordenite were enhanced with increasing wt. % of Zeosil, but it showed adverse effect on the crystallization of ZSM-5.
Synthesis of ZSM-5 and Silicalite-I(I)
Kim, Geon-Joong ; Kwon, Lee-Mook ;
Korean Chemical Engineering Research, volume 26, issue 3, 1988, Pages 261~261
ZSM-5 and Silicalite-I were synthesized hydrothermally using Zeosil 77 and sodium silicate solution as silica sources, and the effects of reactants composition, aging time, reaction temperature and reaction time on the zeolite crystallization were investigated. It was established that the oxides molar ratio of substrates resulting ZSM-5 type zeolite in high purity were as follows;
. For the ZSM-5 type zeolites, the induction period, and reaction time and the obtained crystal size were found to decrease progressively as the aging time is increased up to 2 days. At the same time, the higher rates of crystallization were obtained when sodium silicate solution in conjunction with Zeosil was used as the silica source than Zeosil alone. The activation energies for the nucleation and those for the crystal growth step of ZSM-5 and Silicalite-I were 54.22 KJ/mole（for ZSM-5） and 40, 15 KJ/mole (for Silicalite-I) when sodium silicate solution blended with Zeosil was used as the silica source. On the other hand, the activation energies using Zeosil as the silica source were 60, 38 KJ/mole(for ZSM-5) and 40, 26 KJ/mole (for Silicalite-I), respectively.
The Anodic Evolution of Oxygen on
Film Electrodes in Acid Solutions
Kim, Hyung-Sun ; Cho, Byung-Won ; Yun, Kyung-Suk ;
Korean Chemical Engineering Research, volume 26, issue 3, 1988, Pages 272~272
To reduce oxygen overvoltage, the cobalt oxide film on lead and titanium anodes were prepared by thermal decomposition of
and their anodic polarization characteristics were investigated in acid solutions. The characteristics of
were investigated by TGA, X-ray analysis. The oxidized layer of
electrode was analyzed by ESCA and observed by SEM.
electrode shows the good anodic characteristics with a relatively low overvoltage for oxygen evolution and the good adhesion of the oxide film with the lead support. Dissolution rate of
Physical Absorption of
in Laminar Falling Films of Dilute Polymeric Solutions
Park, Sang-Wook ; Han, Sung-Bum ; Kim, Sung-Soo ; Park, Tae-Yong ;
Korean Chemical Engineering Research, volume 26, issue 3, 1988, Pages 280~280
Diffusion coefficients of
in aqueous Newtonian solution of PEG(polyethylene glycol) and power-law non-Newtonian solution of CMC(sodium carboxymethyl cellulose) with molecular weights varying from 600 to 8,400 and from 32,300 to 136,800, respectively, were obtained from absorption rate measurements in a wetted-wall column. The diffusivity-viscosity relation is found to be a strong function of the molecular weight of the applied polymers. The data suggest the following correlations. For PEG solution at
For CMC solution at
The diffusivity of
in CMC solution was constant with respect to the change of the shear rate at the wall in the studied range of flow rate.
Reaction Mechanism for Synthesis of Isoalkanes from Syngas over Zeolite Supported Ru-Pt Bimetallic Catalysts
Shul, Yong-Gun ; Tatsumi, Takashi ; Tominaga, Hirro-o ;
Korean Chemical Engineering Research, volume 26, issue 3, 1988, Pages 288~288
Probe molecule technique has been applied to clarify the reaction pathway for selective synthesis of isoalkanes in the gasoline range from syngas catalyzed by zeolite Y supported Ru-Pt bimetallic catalysts. Reaction of 1-octene over the metal free dealuminated HY zeolite produced cracking products with high selectivity for isobutanes ;
carbon number distribution was similar to that from CO hydrogenation over dealuminated HY with 2 wt% Ru and 2 wt% Pt. When 1-octene was added into syngas over the various combination of Ru(and/or Pt) catalysts, all the obtained products resulted in similar products pattern besides the i/n ratios of cracking products. Therefore selective formation of isoalkanes from syngas could be essentially due to acid catalyzed reaction on zeolite. With regard to the active center for isoalkane formation modified bifunctional mechanism was also proposed.
Extraction of Al and K Components from Alunite by the Sulfating with Ammonium Sulfate
Lee, Cheol-Tae ; NamGoong, Yeon ; Yu, Yeong-Hong ;
Korean Chemical Engineering Research, volume 26, issue 3, 1988, Pages 295~295
The sulfating of alunite with ammonium sulfate was investigated in order to find the possibility of ammonium sulfate being an alternative sulfating source and a new process for the extraction of Al and K components from the alunite. The proper conditions for the sulfating of alunite in the batch system under argon gas atmosphere were that reaction temperature
, weight ratio of ammonium sulfate to the alunite 9.0, reaction time 2 h and particle size of alunite -200 mesh. Under above mentioned conditions, 96.3% Al and 95.2% K in the alunite were extracted from the alunite ore by the water leaching, respectively.
Preparation of Polysulfone Hollow-Fiber Membranes and Their Ultrafiltration Characteristics
Kwon, Taeg-Min ; Lee, Soon-Hong ; Kim, Jae-Jin ; Kim, Un-Young ;
Korean Chemical Engineering Research, volume 26, issue 3, 1988, Pages 304~304
Several polysulfone hollow fiber membranes for ultrafiltration were prepared by the dry-wet spinning technique with spinning solutions containing polysulfone in one of the solvents such as N, N-dimethylracetamae and N, N-dimethylformamide using polyvinylpyrrolidone and 2-methoxyethanol as additive and nonsolvent which act as pore forming agent. Water and solvent-water mixture were used as bore coagulant and gelation medium. The principal variables of the spinning process investigated are spinning solution composition, the flow rate and composition of the bore coagulant, the air gap between the spinnerette and the gelation bath, etc. As the performance test, pure water flux, solute rejections, and the cut off molecular weights were measured.
in a Screen-Disc Packing Column
Cha, Woon-Ou ; Chun, Hai-Soo ;
Korean Chemical Engineering Research, volume 26, issue 3, 1988, Pages 314~314
The absorption of carbon dioxide accompanied by first order reaction into potassium carbonate-bicarbonate buffer solutions, containing sodium hypochlorite as the catalyst, was used to evaluate liquid film mass transfer coefficients and effective interfacial areas in a screen(60 mesh) disc packing column and a smoothed face metallic disc packing columm, respectively. The residence time distributions using a tracer pulse input-response technique were measured to find the extent of mixing of liquid on the disc packings. It was found that liquid film mass transfer coefficients, effective interfacial areas and the holdup of liquid for both packings increased with increase of liquid wetting rate, that the effective interfacial areas depended on the holdup of liquid, and that the holdup of liquid and the extent of liquid mixing on the screen disc packing increased 1.8 and 1.5 times as high as that on the metallic disc packing, respectively.
Crystallization of Zeolite A and HS and Conversion of Zeolite A into Zeolite HS
Cho, Min-Soo ; Han, Seung-Cheol ; Kim, Young-Man ; Jung, Kyung-Hwan ; Seo, Gon ;
Korean Chemical Engineering Research, volume 26, issue 3, 1988, Pages 323~323
The formation of zeolite A and HS from amorphous solid reactant and the conversion of zeolite A into HS were studied. The reactions could be simulated using the rate equations based on the independent formation of zeolite A and HS from dissolved reactant and the dissociation of zeolite A. The increases in the formation rate of zeolite HS at higher temperature and alkaline concentration were explained in terms of increases in the concentration of dissolved reactant and rate of nuclei formation of zeolite HS.
The Analysis of Thermal Instability in a Horizontal Fluid Layer Heated from Below under Constant Heat Flux
Lee, Jong-Dae ; Choi, Chang-Kyun ; Shin, Chee-Burm ;
Korean Chemical Engineering Research, volume 26, issue 3, 1988, Pages 330~330
When an initially quiescent, horizontal fluid layer is heated uniformly from below, the critical time of the onset of natural convection is analysed by employing the propagation theory. For deep-pool systems the basic temperature profile is approximated by using the integral method and a new stability equation is generated. The critical conditions are found to have following relation:
This relation agrees well with experimental data in the range of $Ra>10^4$. Also, it is seen that the initiated convection is amplified to observable magnitude at the time