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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 :
KIM JAE JEONG
Volume & Issues
Volume 24, Issue 6 - Dec 1986
Volume 24, Issue 5 - Oct 1986
Volume 24, Issue 4 - Aug 1986
Volume 24, Issue 3 - Jun 1986
Volume 24, Issue 2 - Apr 1986
Volume 24, Issue 1 - Feb 1986
Selecting the target year
Dehydration of Ethanol on the Synthetic Zeolite NaA and LiA Catalyst
Jeon, Kwang-Su ; Tae, Kyung-Seob ; Kim, Myun-Sup ;
Korean Chemical Engineering Research, volume 24, issue 3, 1986, Pages 163~163
The catalytic dehydration of ethanol to produce ethylene and ether was studied in
temperature range under the atmospheric pressure. Zeolite NaA catalyst was synthesized from kaolin. Zeolite LiA catalyst was prepared by exchanging of
ion of Zeolite NaA with
ion. Ethylene selectivity on Zeolite LiA catalyst was larger than that on Zeolite NaA catalyst. Dehydration on Zeolite LiA catalyst was found to be a single-site surface reaction controlled mechanism. Activation energy of the reaction to produce ethylene from ethanol on Zeolite LiA was 12.5 Kcal/mol. Adsorption enthalpy of ethanol and water on Zeolite LiA was -4.106 Kcal/mol and -8.64 Kcal/mol, respectively.
A Study on the Recovery of Uranium(VI) from Wet Process Phosphoric Acid by Liquid Surfactant Membrane(II)
Kim, Kwang-Wook ; Yoo, Jae-Hyung ; Park, Hyun-Soo ;
Korean Chemical Engineering Research, volume 24, issue 3, 1986, Pages 171~171
A new model was proposed for mass transport through liquid surfactant membrane in the recovery of uranium from the wet process phosphoric acid. The synergistic combined extractant of di(2-ethylhexyl) phosphoric acid (
) plus trioctylphosphine oxide (TOPO) was used as a carrier in the W/O/W system. The stripping of uranium, described by using an effective mass transfer coefficient, was considered as a rate controlling step together with the diffusion of uranium complex across the membrane. The breakage of emulsion in the W/O/W system has also been considered in this model. Consequently, the predicted result by the present model was found to be in fairly good agreement with the experimental result.
Effect of Pressure on Azeotrope(Low Pressure)
Rhim, Jin-Nam ; Lee, Ho-Tae ;
Korean Chemical Engineering Research, volume 24, issue 3, 1986, Pages 179~179
For the 6 binary systems of chloroform with acetone, 2-butanone, ethyl formate, methyl acetate, ethyl acetate, and vinyl acetate, we measured azeotropic temperatures and compositions at low pressure range (400mmHg-800mmHg). And at each pressures, we calculated the azeotropic points by using UNIFAC equation. The azeotropic points obtained from experiment and calculation were comparatively identified. By ploting pressure vs. azeotropic points, we could get an equation,
, and azeotropic compositions changed linearly with pressures.
Liquid-Liquid Equilibria for Ternary Systems with Solvent - Water - Acetone
Choi, Joong-So ; Rhim, Jin-Nam ;
Korean Chemical Engineering Research, volume 24, issue 3, 1986, Pages 185~185
The binodal curves for following ternary systems: 1-1-2 trichloroethane-water-acetone, monochlorobenzene-water-acetone, cyclohexane-water-acetone, ethylacetate-water-acetone, chloroform-water-acetone, and methylisobutyl ketone-water-acetone were determined at
. From these binodal curves, tie-line and plait-point were determined. The parameters in NRTL model were determined with only experimental tie-lines by the least-squares method to predict the value of tie-lines. The distribution and the selectivity curves were determined for ternary systems and solvents extraction effectiveness was also examined.
Effect of Cesium Additives on Molybdena-Alumina Catalyst(I)
Mun, Se-Gi ; Kim, Hyeong-Jin ; Gang, Sin-Chun ; Seo, Gyo-Taek ;
Korean Chemical Engineering Research, volume 24, issue 3, 1986, Pages 195~195
In order to study the acid-base properties of the cesium-containing molybdena-alumina catalysts, the amount of adsorbed pyridine was measured and the decomposition of isopropyl alcohol as a probe reaction was carried out. As the cesium-content was increased, the dehydration activity of isopropyl alcohol was decreased and the dehydrogenation activity passed through a maximum. Adsorbed amount of pyridine was increased with increase in cesium-content. These results suggest that cesium additives lead to decrease the amount of acid sites.
Calcination Mechanism of Limestone
Jung, Bong-Jin ; Park, Yong-Jue ;
Korean Chemical Engineering Research, volume 24, issue 3, 1986, Pages 203~203
It has been shown that calcination of limestone is endothermic reaction and takes place on a definite boundary between the undecomposed limestone and the layer of porous lime formed outside it. This boundary moves towards the center of the limestone but remains spherical in shape. The rates of reaction occurring during the calcination of limestone are involved the following four processes. The first two processes are heat transfer between gas and limestone by radiation and convection and conduction of heat in the product layer (lime). The other two processes are chemical reaction in the reaction interface and
gas diffusion in lime. Especially the rate of reaction was controlled by the conduction of heat in lime. Applying to the unreacted-core model, rigorous expressions based on heat transfer rate have been derived for the prediction of relations between time required for complete calcination, temperature, and sizes of limestone. When the rate of reaction of limestone was given by ignition loss weights of
at any time, it was proportional to the difference between the temperature supplied from the surroundings and the decomposition temperature of limestone. The experimental values of the thermal conductivities of limestone and lime were determined by the unsteady state method in the temperature ranges below
Analysis of a Fixed-bed Adsorption-Reaction System with Freundlich Isotherm (II)
Nam, Young-Woo ; Rhee, Hyun-Ku ;
Korean Chemical Engineering Research, volume 24, issue 3, 1986, Pages 215~215
The dynamic behavior of fixed-bed adsorption-reaction system has been represented by a pair of quasilinear partial differential equations of first order and analyzed by using the method of characteristics and introducing the theory of mathematical shock. It was assumed that a first order, irreversible reaction occurs in the fluid phase and adsorption of both the reactant and product follows the Freundlich isotherm. The system response was determined for a step change as well as for a square wave change in the reactant feed concentration. Methyl formate was hydrolyzed through a charcoal bed at room temperature to measure the breakthrough curves for methyl formate and methanol, respectively, when the reactant feed concentration underwent a step change and a square wave change. The experimental curves were in good agreement with those predicted by the theoretical analysis. This might be considered as an evidence for the validity of the method of analysis employed in this study. It is expected that the results for the square wave input would be useful for the design and operation of chromatographic reactors.
Parameter Effects on the Facilitated Transport of Carbon Dioxide
Ji, Yong-Chae ; Jeong, Yong-Won ; Im, Seon-Gi ;
Korean Chemical Engineering Research, volume 24, issue 3, 1986, Pages 227~227
Effect of sodium bicarbonate and sodium arsenite on the facilitated transport of carbon dioxide through alkaline liquid membrane was investigated in view of the ionic strength and the pH of the solution through the boundary layer approximation. With the increase in the content of sodium bicarbonate, the pH of the solution increased while the difference of pH across the membrane decreased. Under the same ionic strength of the solution the concentration gradient of bicarbonate ion in the membrane increased and the pH and its gradient decreased with the content of sodium arsenite. It was confirmed that sodium arsenite facilitated the transport of carbon dioxide not only by catalyzing the hydrolysis of carbondioxide but also by buffering the pH.
Approximations of Thin Liquid Film Flows in Dip Coating
Ghim, Young-Sung ; Chang, Ho-Nam ;
Korean Chemical Engineering Research, volume 24, issue 3, 1986, Pages 237~237
When the meniscus is shape important and the velocity distribution itself is not required in high accuracy, the basic equations have been transformed and combined to yield a meniscus shape equation, an integral-y-momentum equation and an integral-x-momentum equation. Although their original forms were exact as they were, thin film assumption with a parabolic velocity profile across the film rendered the working equation to emphasize the flow characteristics near the free surface or on the solid surface, or to accomodate these two flow patterns. Most frequently used in recent times is the integral-x-momentum equation designated by the integral method in the literature. But a critical examination of simulated results for the dip coating process revealed that the integral method could be applied safely to the limited case of employing the liquid of large surface tension and small withdrawal speed. Simulation was carried out in terms of M and
instead of the capillary and Reynolds numbers, and distinct tendencies of the final film thickness, the entrance length and the dynamic meniscus profile could be observed.
Continuous Ethanol Fermentation using Immobilized Saccharomyces Formosensis
Suh, Kuen-Hack ; Song, Seung-Koo ;
Korean Chemical Engineering Research, volume 24, issue 3, 1986, Pages 247~247
A Tubular Fermentor was prepared by packing the wood chips and pumping the yeast solution in a tubular column. The experiments were prepared to determine the immobilization process variables, such as flow velocity and wood chip size. Investigations to characterize ethanol fermentation in the immobilized cell tubular fermentor were undertaken and these results were compared with those of other fermentors.