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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 18, Issue 6 - Dec 1980
Volume 18, Issue 5 - Oct 1980
Volume 18, Issue 4 - Aug 1980
Volume 18, Issue 3 - Jun 1980
Volume 18, Issue 2 - Apr 1980
Volume 18, Issue 1 - Feb 1980
Selecting the target year
Three Phase Fludized Beds
Kim, Sang-Done ; Kim, Chang-Ho ;
Korean Chemical Engineering Research, volume 18, issue 5, 1980, Pages 313~313
This review evaluates the present research activities in the field of three phase fluidized beds. The published research works on the individual phase holdup, bed expansion and contraction, bubble properties, phase axial mixing characteristics, and mass and heat transfer properties are summarized. New research directions are recommended for the future research activities in three phase fluidized beds.
Production of Sorbose from Sorbitol using a Two-Stage Continuous Bio-Reactor System; Optimization of Operating Condition
Koo, Yoon-Mo ; Ryu, Dewey Du-Yeong ; Kim, Young-Gul ;
Korean Chemical Engineering Research, volume 18, issue 5, 1980, Pages 333~333
Using a two-stage continuous culture system, the parameters that affect the productivity of sorbose were studied and the operating conditions which correspond to the maximal productivity of sorbose were determind. The maximum specific growth rate of Acetobacter suboxydans strain employed was
and its optimal growth pH was determined as 4.6. The maximum productivity of sorbose obtained employing a batch culture system was 19 mmole/liter/hr at 90% conversion level. The enzymatic conversion of sorbose was found to be proportional to the cell concentration, and the cell concentration in the second-stage continuous bioreactor was increased by using a filter system installed at the effluent line. Under the optimal operating conditions,
, pH 4.6, and sorbitol concentration 20%, the two-stage continuous fermentation system yielded the productivity of 45 mmole sorbose/liter/hr while maintaining 90% or higher level of conversion, indicating that a significant improvement in the sorbose productivity could be achieved by employing the two-stage continuous bioreactor system combined with the cell enrichment technique.
A Numerical Study of Natural Convection in a Spherical System
Hwang, Dong-Hwa ; Suh, Moon-Ho ; Lee, Ki-Jun ;
Korean Chemical Engineering Research, volume 18, issue 5, 1980, Pages 343~343
Unsteady natural convection phenomena of air in a sphere heated suddenly from the outer surface were studied numerically for the axisymmetric cases. Boussinesq approximation was applied to the equations of motion which described the buoyant circulation of air in the sphere, and the solution method was based on the stream function-vorticity approach. Numerical simulation of the unsteady convection was accomplished and presented by using the mixed finite difference schemes which proved efficient for the spherical coordinate systems as well.
A Critical Analysis on the Mathematical Modeling of Coal Combustion(II) -Effects of the Boudouard Reaction-
Jung, Kwang-Seop ; Park, Jin-Yong ; Park, Won-Hoon ;
Korean Chemical Engineering Research, volume 18, issue 5, 1980, Pages 351~351
The isothermal burning of coal was studied through a mathematical model which includes the Boudouard reaction at the coal surface
in addition to the primary surface reaction
and the secondary homogeneous reaction
. The existence and significance of double-film are discussed as well as the effects of the Boudouard reaction on various aspects of the combustion process.
The Stability of a Horizontal Fluid Layer Heated Uniformly from Below(Asymptotic Analysis)
Kim, Jang-Joo ; Choe, Chang-Gyun ;
Korean Chemical Engineering Research, volume 18, issue 5, 1980, Pages 359~359
The extended Rayleigh-
problem, where an unperturbed temperature profile is nonlinear and time-dependent, was examined by linear stability theory. The unperturbed temperature profile induced by constant heat flux from below was approximated, using a bottom temperature and penetration distance. Applying this modified temperature profile to the present system, the asymptotic power-series method was developed and the onset of natural convection was analyzed. It was found that this analysis is well applied to the transient system with the Rayleigh number larger than
. It is evident that for large Prandtl numbers temperature disturbances are confined within the effective thermal depth.
Membrane Separation of Hydrogen-Nitrogen Gas Mixtures
Kim, Jin-Seong ; Choe, Chang-Gyun ;
Korean Chemical Engineering Research, volume 18, issue 5, 1980, Pages 367~367
The study of hydrogen recovery from a
gas mixture was conducted both theoretically and exprimentally. For the application to the system which exhibits the intermediate trend between perfect-mix and no-mix （cross-flow） models a new model was formulated. Pure gas permeabilities of silicon rubber, polyethylene and microporous aluminum films were measured at
. The silicon rubber of these was tested as a separation membrane using binary gas mixtures and the effect of stage cut and feed composition was examined experimentally. In comparison with mathematical models it was found that the present permeation characteristics are reasonably well represented by the no-mix model.
Phase Holdup Characteristics of Three Phase Fluidized Beds of Mixed Particles
Oh, Jae-Seung ; Kim, Sang-Done ;
Korean Chemical Engineering Research, volume 18, issue 5, 1980, Pages 375~375
Individual phase holdups were measured in three phase fluidized beds of mixed particles having binary size distributions. The bed contraction phenomena, which have been observed in the beds of small monosized particles, could not be found for some mixtures of solid particles at the same experimental conditions. The variation of bed porosity and liquid phase holdups showed miniumm values depending upon the variation of weight fraction of the component particles. The minimum fluidizing velocity of the mixed particle systems was comparatively lower than that of the large particle component only. Results were summarized with dimensionless correlations, in terms of fluid Reynolds and Froude numbers based on harmonic mean particle diameter, which can be applicable to both monosized and mixed particle systems.
Recovery of Elemental Sulfur from Pyrites
Jin, Gyoung-Tae ; Ahn, Hyuk-Man ; Kim, Sang-Done ;
Korean Chemical Engineering Research, volume 18, issue 5, 1980, Pages 385~385
The elemental sulfur recovery from the thermal decomposition of pyrite and the aqueous oxidation of pyrrhotite were studied in a batch and fluidized bed reactors. In the thermal decomposition reaction, the effects of reaction time, temperature and particle size on the rate of reaction conversion were examined. In thermal decomposition reaction, the optimum reaction conversion was obtained in the temperature range of 700 and
and reaction time of 30 minutes. In aqueous oxidation process, 70% of elemental sulfur was recovered from pyrrhotite (-60 +325 mesh) at temperature of
, pressure of 150 psig and reaction time of 90 minutes.
Product Distribution in the Ethanolamine Manufacturing Process
Ahn, Yong-Soo ; Lee, Tae-Yeong ; Chang, Yong-Keun ; Chung, Chang-Bock ; Ihm, Son-Ki ;
Korean Chemical Engineering Research, volume 18, issue 5, 1980, Pages 393~393
Ethanolamines being manufactured through a liquid phase reaction of ethylene oxide and 28% ammonia water, the effects of reaction temperature, feed mole ratio （defined as the ratio of ammonia to ethylene oxide）, water concentration, and the amines in the feed on the distribution of each ethanolamine product (mono-, di-, and triethanolamine) were investigated with batch and continuous tubular reactor systems. Material balances indicate that the product distribution does not depend on the absolute values of rate constants but on the ratios among them. Themperature has negligible effect on the product distribution over the range of temperatures between
. The feed ratio is a predominant factor to product distribution, such that as the ammonia ratio increases, the fraction of monoethanolamine increases and that of triethanolamine decreases, while that of diethanolamine increases slightly and then decreases. Water in the reaction mixture plays a role of catalyst and as water concentration increases, the formation of monoethanolamine is promoted. Mono- and diethanolamine may be added or recycled into feed in order to control the product distribution. However there are limitations in their ammounts for a given feed mole ratio and the product distribution can be estimated reasonably well by using the ratios among the rate constants as obtained when the feed does not contain ethanolamines.
Thermal Decomposition of Ammonium Chloride with the Aid of Reduced Copper
Kim, Hoon-Sik ; Lee, Moon-Deuk ;
Korean Chemical Engineering Research, volume 18, issue 5, 1980, Pages 401~401
The two-stage decomposition of ammonium chloride into ammonia and hydrogen chloride with the aid of reduced copper and other additives was investigated. The mechanism of the reaction is as follows :
(2) The most effective promoter for this reaction turned out to be the one obtained from the mixture of
, alumina, NaCl and KCl and reduced under the hydrogen atmosphere at
. The maximum yields of ammonia for the stage (1) and hydrogen chlorides for the stage (2) are 83% and 80%, and the flow rates of hydrogen are
The Distance from Source to the Point of Looping and Trapping Plumes First Touching Ground Down-wind of a Tall Stack
Park, Ok-Hyun ;
Korean Chemical Engineering Research, volume 18, issue 5, 1980, Pages 411~411
In order to establish the relationship of the distance of looping and trapping plumes' first touching ground with wind speed and to predict the closest ground level approach of fluctuating plumes, a visual record of plume dispersion at Mt. Isa, Australia, where terrain is flat, was provided by using a movie camera. As results of the treatment of the record in connection with meteorological data associated, following conclusions were drawn ; 1) The proportional constant of a linear relationship between wind speed and the distance of looping plume's first touching ground over flat terrain is about 0.5. 2) The minimum distance of trapping plume's first touching ground appears to be around stack height.
Energy of Tomorrow-Hydrogen-
Yun, Kyung-Suk ;
Korean Chemical Engineering Research, volume 18, issue 5, 1980, Pages 419~419