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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 28, Issue 6 - Dec 1990
Volume 28, Issue 5 - Oct 1990
Volume 28, Issue 4 - Aug 1990
Volume 28, Issue 3 - Jun 1990
Volume 28, Issue 2 - Apr 1990
Volume 28, Issue 1 - Feb 1990
Selecting the target year
Interactions between Hydrodesulfurization and Hydrodeoxygenation over Sulfided
Park, Hea-Kyung ; Jeon, Kwang-Seoung ; Kim, Kyung-Lim ;
Korean Chemical Engineering Research, volume 28, issue 1, 1990, Pages 1~1
Interactions between thiophene hydrodesulfurization(HDS) and m-cresol hydrodeoxygenation (HDO) and the kinetic analysis were studied over sulfided
catalyst at the range of temperatures between 423K and 723K, the total pressures between
and the contact times between 0.0125g-cat. hr/ml-feed and 0.03g-cat. hr/ml-feed. Hydrodesulfurization of thiophene was inhibited by the presence of m-cresol at all temperatures and pressures and hydrodeoxygenation of m-cresol was also inhibited by the presence of m-cresol at all temperatures and pressures but inhibition effect was severer at low temperatures. The rate equations of thiophene and m-cresol was given to be
in terms of Langmuir -Hinshelwood-Hougen-Watson model. At each temperature, reaction rate constants and adsorption equilibrium constants were determined and the activation energies of thiophene HDS and m-cresol HDO were 13.51kcal/mole and 17.79kcal/mole, respectively.
Digital Control of Cell Mass Concentration in Continuous Stirred Tank Bio-Reactor Part2. Cell Mass Control Using Bilinear Adaptive Control Algorithms
Hwang, Young-Bo ; Yi, Gyeong-Beom ; Chang, Ho-Nam ; Lee, Kwang-Soon ;
Korean Chemical Engineering Research, volume 28, issue 1, 1990, Pages 11~11
Four bilinear adaptive controllers were developed for control of a continuous yeast cell cultivation process. The process was described by a SISO-bilinear model having only one unknown time-varying parameter. Each control algorithm was designed by combining exponential data weighting least squares parameter estimator and generalized one-step ahead controller, and the design variables were set to specific values. Those algorithms were named BAC(Bilinear Adaptive Control), WIBAC(Weighted Input Bilinear Adaptive Control), SBA(Simple Digital Control). Experiments in a laboratory scale CSTBR demonstrated that the developed bilinear adaptive controllers had satisfactory dynamic properties. A theoretical proof of global convergence of WIBAC algorithm was established.
Compression Characteristics of the Flocculated Granule with Polymeric Binders Part II. Correlation between Intragranular Stress and Compacted Density in the granular Bed
Kim, Hyoun-Soo ; Park, Bang-Sam ; Lee, Jun-Wung ;
Korean Chemical Engineering Research, volume 28, issue 1, 1990, Pages 22~22
When the flocculated granule with polymeric binders were compressed, correlations for intragranular stress, particle-wall friction, and % TMD in the granular bed has been investigated. The relation between the applied pressure and the transmitted pressure was linear over the entire applied pressure range for all of the samples. The effect of the granule size and distribution on the compacted density was dominated largely due to the binder characteristics.
Experimental Studies on Flocculation of Solid Particles and Solid-Liquid Separation with Couette Flocculators Part 2: Flocculation Kinetic Modeling
Jeon, Gwi ; Choe, Chang-Gyun ;
Korean Chemical Engineering Research, volume 28, issue 1, 1990, Pages 30~30
The study on flocculation in a Couette flocculator showing Taylor Vortices and subsequent solid-liquid separation characteristics were conducted experimentally. For this study, silica or kaolin suspensions in water were used to investigate flocculation by cationic polymers. The minimum flocculant concentration to show the maximum separation efficiency was found proportional to 0.425-power of the suspension concentration. The adsorption ratio of polymer flocculant on suspended particles decreased as the suspension concentration increased. An empirical flocculation kinetic model without floc breakage was suggested to combine the kinetic model of Huch and Murphy into that of LaMer and Healy. The important parameters were the initial suspension concentration, the unflocculated suspension concentration, the retention time and the root-mean-square velocity gradient.
Low Temperature Hydrogen-Oxygen Unit Fuel Cell with Double Porous Electrode (Unit Fuel Cell Performance of Different Electrode Structures)
Yun, Jeong-Hyun ; Rho, Yong-Woo ; Joe, Yung-Il ; Lee, Tae-Hee ;
Korean Chemical Engineering Research, volume 28, issue 1, 1990, Pages 38~38
An experimental low-temperature hydrogen-oxygen fuel cell was constructed and its performance was tested for various electrode structures. Both electrodes for hydrogen and oxygen were made by the same method and various double porous structures of the electrode were obtained by changing the contents of carbonyl nickel and ammonium bicarbonate. Experimental results show that electrochemical reaction velocity depends not only on the specific surface area where electrochemical reaction occurs but also on the ratio of large pores and small pores of the electrode.
Characterization of Sulfate Promoted Iron Oxide Catalyst
Park, Doo-Seon ; Lee, Jae-Sung ;
Korean Chemical Engineering Research, volume 28, issue 1, 1990, Pages 45~45
A sulfate-promoted iron oxide(A sulfate-promoted iron oxide(
)has been prepared and its properties have been characterized. Interactions with various adsorbates such as pyridine, ammonia, n-butane and 1-butene has been investigated by FT-1R. Surface sulfate group in
was thermally stable up to
, but decomposed to yield gaseous
at higher temperatures. During the thermal treatment, the sample lost water and showed a strong adsorption band at
due to the asymmetric stretching vibration of covalent S=O double bonds. This band was very sensitive to all adsorbates and shifts to lower wave numbers as the bond lost its double bond character by adsorption. Mainly Lewis acid sites were observed on the sample, together with some
acid sites generated by water inadvertently introduced into the system.
into Slurries (I) -Solubility and Diffusivity of Carbon Dioxide in Aqueous Slurries of Kaolin and White Carbon-
Park, Sang-Wook ; Kim, Sung-Soo ; Kim, Jong-Hyun ;
Korean Chemical Engineering Research, volume 28, issue 1, 1990, Pages 52~52
The solubilities and diffusivities of
gas in aqueous kaolin and white carbon slurries at 1 atm and
were obtained by the gravitational method and using a wetted-wall column. The amounts of
gas adsorbed onto the surface of white carbon in aqueous slurries could be calculated and the increase of solubilities of
gas in aqueous white carbon slurries could also be explained. Linear equations could be used for the prediction of the solubilities and diffusivities of gas in aqueous slurries and the calculated values from the equations could be correlated with the experimental values very well.
Calculation of Crystal Size Distribution for Batch and Continuous MSMPR Crystallizer
Han, Hyun-Kak ; Lee, See-Il ; Lee, Chul-Soo ;
Korean Chemical Engineering Research, volume 28, issue 1, 1990, Pages 58~58
A unified solution method of pouplation balance equation for a batch and continuous MSMPR crystallizer was presented and a method for taking the volume change of mixing into consideration was developed when the supersaturation is induced by adding a third component. The volume effect can be very important when the supersaturation becomes very small. Also, crystallization rate equations were developed which are applicable to both batch and continuous operations. Comparison of calculated crystal size distributions with experimental ones for NaCl-water-ethanol systems showed good agreement.
Electrochromic Display Device of Tungstem Oxide Thin Film Using Liquid Electrolyte and Solid Electrolyte
Choi, Yoon ; Cho, Won-Il ; Cho, Byung-Won ; Yun, Kyung-Suk ;
Korean Chemical Engineering Research, volume 28, issue 1, 1990, Pages 67~67
The inorganic electrochromic display device used tungsten oxide thin film on indium-tin oxide transparent electrode as a display electrode. Display electrode was made by rf-sputtering and evaporation methods. The characteristics of electrochromic display device such as response time, memory time, stability, coloration and bleach were studied. When display electrode was colored and bleached in the liquid electrolyte of lithium salt-organic solvent, the coloring current and bleaching current of display electrode were increased by increasing the amount of water in electrolyte. The optical density and response rate of ECD cell were enhanced by depositing
film, and decreasing the leak current. In the case of ECD cell with two coloring layers, gas evolution was suppressed and the degree of coloration was enhanced below -3.0V. In the case of using LiF solid electrolyte, the response rate and memory characteristics were excellent, but bleaching was poor as the number of coloration and bleaching cycle increases.
The Effect of Cobalt Salt on the Adhesion between Brass-Plated Steel Cord and Rubber Compound
Seo, Gon ; Kim, Min-Ho ; Jeon, Gyung-Soo ; Oh, Sae-Chul ; Noh, In-Kee ;
Korean Chemical Engineering Research, volume 28, issue 1, 1990, Pages 77~77
The effect of cobalt salt in rubber compound on the physical properties of the rubber compound and the adhesion properties between the rubber compound and brass-coated steel cord was studied. Although the change in the physical properties of the rubber compound with the addition of cobalt salt was small, the adhesion properties were changed significantly with the loading level of cobalt salt and aging treatments. Pullout force and rubber coverage of the steel cord were enhanced in the rubber compound with low loading of cobalt salt. When the loading level of cobalt salt was higher then 1.5phr, the adhesion was severely deteriorated after aging treatments. The easy failure in the adhesion of the sample with high loading of cobalt salt was explained in terms of the growth of the interfacial layer.
A study on the Collapse of Spherical Bubbles in Non-Newtonian Fluids Using a Finite Element Method in the Lagrangian Frame
Kim, Chong-Youp ;
Korean Chemical Engineering Research, volume 28, issue 1, 1990, Pages 85~85
In this research, the collapse of a spherical caviation bubble contained in a large body of upper convected Maxwell fluid was studied theoretically. A fully explicit numerical scheme was developed which could track the bubble surface without iteration. It was observed that, when Re was less than 10, fluid elasticity accelerated the collapse in the early stage of collapse while in the later stage it retarded. When Re was larger than 10, however, fluid elasticity was no longer effective in changing the pace of collapse due to the large inertia. The retardation for Re<10 was expected to be related with the reduced cavitation damage in viscoelastic fluids.
Analysis of Yield and Operation Energy Utilizing Digitized Thermodynamic Property Charts in Supercritical Fluid Extraction Processes
Kim, Seon-Yeong ; Lee, Gwang-Sun ; Lee, Won-Hong ; Yu, Gi-Pung ;
Korean Chemical Engineering Research, volume 28, issue 1, 1990, Pages 93~93
We presented an algorithm that can constructs digitized databases from various graphical representations such as thermodynamic property charts by utilizing a desk-top digitizer properly. It is found that any types of usual model-oriented process calculation such as interpolations and process optimization can be equivalently accomplished with these digitized property charts. As the first illustration, the compressibility factors for any reduced temperature and pressure can be evaluated quickly and accurately by digitized Pitzer's Z-chart with linear and cubic spline interpolation methods. As the second illustration, optimum operation paths which give maximum separation yield with the least of energy demand can be sought with the digitized property chart for the supercritical extraction process of soybean oil with carbon dioxide.
NO Reduction by
on Natural Zeolite Containing Cupric Ions
Hwang, Ung-Cheon ; Nam, In-Sik ; Kim, Young-Gul ;
Korean Chemical Engineering Research, volume 28, issue 1, 1990, Pages 104~104
Selective removal of NO by
on natural zeolite from Young-il, Korea with various copper loadings(CuNZA) has been studied in a packed bed flow reactor system with simulated flue gas. Two orders of magnitude increase in the reaction rate were achieved by the addition of copper ions to the catalyst. The first order, irreversible kinetic model with respect to NO concentration adequately fits experimental data for this reaction system as did for synthetic mordenite zeolite system(CuHM)over the low reaction temperature(
) covered, independent of the copper level. The optimum copper content is aboue 3wt%. It is expected that CuNZA catalyst will have stronger sulfur tolerance than CuHM because of its typical physical properties such as surface area, pore size distribution and Si/Al ratio.
Effect of Specific Surface Area on Treating a Strong Waste by Aerobic Fixed-Film Process
Park, Tae-Joo ; Lee, Min-Gyu ; An, Kab-Hwan ; Song, Seung-Koo ;
Korean Chemical Engineering Research, volume 28, issue 1, 1990, Pages 114~114
This study was conducted to investigate the characteristics and treatment efficiency of aerobic fixed-film process with different specific surface area upon the variation of organic loading rate. The media used for this study was SARAN 4000D(media S) with specific surface area
, and 1000D(media B)with specific surface area
. The substrate used was a dye plant processing wastewater and the feed solution was diluted two fold or more as the feed solution. The influent COD concentration ranged about 1250 to
. Average biomass concentrations were
on the media B and S, respectively. The value of media B was about 9.5% higher than that of media S. Average amounts of attached biomass were
on the media S and
on the media B, but the total amount of accumulated biomass was nearly the same.
Performance Change of Reverse Osmosis Membrane by Fabrication into Spiral-Wound Module
Park, Seok-Woo ; Park, Yong-Seok ; Chang, Ho-Nam ;
Korean Chemical Engineering Research, volume 28, issue 1, 1990, Pages 124~124
Permeation characteristics of NaCl solution were studied using a cellulose acetate reverse osmosis spiral-wound module. The pure water permeability through the module was
atm which amounted to 13% of the cell test. The lower permeability of the module is attributed to the permeate flow resistance through the support inserted between the two membrane envelopes. As the pressure was increased, the permeability and salt rejection increased. The permeability and the flux were dependent on the inlet flow rate to the module and the way of packing. For a uniform flow distribution in the module, several distributor tips were designed, among which
cone-type distributor was found to be most suitable.