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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 29, Issue 6 - Dec 1991
Volume 29, Issue 5 - Oct 1991
Volume 29, Issue 4 - Aug 1991
Volume 29, Issue 3 - Jun 1991
Volume 29, Issue 2 - Apr 1991
Volume 29, Issue 1 - Feb 1991
Selecting the target year
Characteristics of Cu(II) Precipitation by the Liquid Phase Reaction with Sulfide
Kim, Kwang-Joo ; Lee, Choul-Ho ; Shin, Jung-Ho ;
Korean Chemical Engineering Research, volume 29, issue 6, 1991, Pages 639~639
The characteristics of CuS precipitation, which will be adapted to Cu(II) elimination from waste water, were investigated. A Coulter Counter was used in CuS particle size analysis. The rates of nucleation and growth of CuS were represented by classical nucleation theory and two step model, respectively. The rate of nucleation of copper sulfide from its ions is a fifth-order reaction and the order of the overall growth process is 0.746. The interfacial tension between the CuS particles and the surrounding solution, which has been calculated by uncleation theory and experimental data, is determined to be
. The growth rate of CuS particles can be predicted by the following equation succesfully.
Estimation of Solute Concentration at Membrane Surface and Sherwood Number Correlation Modification in Ultrafiltration
Cho, Hyun-Su ; Oh, Joon-Taek ; Lee, Ho-Won ; Kim, Woo-Sik ;
Korean Chemical Engineering Research, volume 29, issue 6, 1991, Pages 646~646
Concentrations at membrane surface were predicted from ultrafiltration experiments of dextran 500T solution in a flat plate. From this results, considering the change of physical properties in boundary layer, modified Sherwood number correlation was introduced. This correlation reduced the errors for operation pressure difference variation. The modified Sherwood number correlation equations are as follows:
(osmotic pressure model)
(boundary layer resistance model)
Calculation of Vapor-Liquid Equilibria of Multicomponent Mixtures Using Continuous Thermodynamics
Kim, Sun-Wook ; Rho, Ho-Kyu ; Kim, Han-Sik ;
Korean Chemical Engineering Research, volume 29, issue 6, 1991, Pages 654~654
Continuous thermodynamics is adopted in order to calculate the vapor-liquid equilibria of multi-component mixtures and the results are analyzed by applying to n-alkanes, aromatic oils and lemon oil mixtures extracted with supercritical carbon dioxide. In this work the mixtures are treated as semi-continuous whose distribution variable for the continuous fraction is normal boiling temperature. The vapor-liquid equilibrium calculations are performed using the Soave-Redlich-Kwong(SRK) and the Peng-Robinson(PR) equations of states by defining one continuous fraction for n-alkanes and aromatic oils and two continuous fractions for lemon oil mixtures.
High Pressure Binary Phase Equilibria of Anisole, Methylanisole Isomers with Carbon Dioxide
Park, Sang-Do ; Kim, Choon-Ho ; Choi, Cheong-Song ;
Korean Chemical Engineering Research, volume 29, issue 6, 1991, Pages 663~663
Anisole and methyl anisole isomers which containing methyl functional group on anisole at the ortho, meta, para position were chosen as one of the aromatic hydrocarbons and carbon dioxide was chosen as the other component. K-factors obtained by experiment were compared with predictions from the perturbed-anisotropic-chain theory(PACT)and the Peng-Robinson(P-R) equation of state. The characteristics of Peng-Robinson(P-R) equation of state and perturbed-anisotropic-chain theory(PACT) which are applied on these systems were investigated.
The Effect of the Liquid Entrainment and Weeping on the Plate Efficiencies
Kim, Sung-Chul ; Song, Kyu-Min ; Hong, Won-Hi ; Lee, Huen ; Yang, Seung-Man ;
Korean Chemical Engineering Research, volume 29, issue 6, 1991, Pages 670~670
The effects of liquid entrainment and weeping on the plate efficiencies of the multistage column are theoretically analysed. The presented model assumes the existence of concentration profile both in the liquid flowing direction and in the radial direction. Sample results are shown graphically and compared with the experimental data reported in the literatures.
Influence of Platinum Particle Size of Carbon-Supported Electrode on the Electroreduction of Oxygen in Phosphoric Acid Fuel Cell
Hwang, Jung-Tae ; Chung, Jong-Shik ; Choi, Jun-Su ; Sung, Jun-Yong ; Kim, Hwa-Yong ; Yoon, En-Sup ;
Korean Chemical Engineering Research, volume 29, issue 6, 1991, Pages 680~680
Platinum particles with mean particle size from 0.8 to 1.8nm were loaded on carbon black sup-ports by either impregnation or colloidal method. In order to change particle size and intercrystallite distance of platinum, the surface area of carbon was varied and the prepared Pt/carbon catalysts were treated at
in helium atmosphere. An half-cell test was conducted with Teflon-bonded Pt/C electrodes in order to investigate the oxygen reduction current density in 100% $H_3PO_4$ at
. Catalytic activity was strongly dependent on the platinum particle size; the maximum in mass activity was observed at about 3nm and the specific activity increased with increase in particle size. The effect of intercrystallite distance on the activity was mainly contributed from the effect of platinum particle size. It was possible to obtain the oxygen reduction current density of 270mA per
electrode at cathode potential of 0.7V/RHE.
Study on the Epoxidation of Allyl Chloride -I. Catalytic Activity and Reaction Mechanism of Homogeneous Molybdenum Catalysts-
Park, Byoung-Gi ; Chung, Jong-Shik ; Park, Dae-Chul ; Park, Dae-Won ;
Korean Chemical Engineering Research, volume 29, issue 6, 1991, Pages 687~687
Homogeneous liquid phase epoxidation of allyl chloride with tert-butyl hydroperoxide was carried out in the presence of various Mo catalysts in a batch reactor. The reaction has been carried out at
and 1atm with
of catalyst in 1,1,2,2-tetrachloroethane solution.
were found to be the most active and selective catalyst. The epoxidation was strongly inhibited by Lewis base such as tert-butyl alcohol, pyridine and water. Kinetic data were obtained for the
catalyst system and could be represented by Michaelis-Menten kinetics.
Thermal Degradation of Poly(Alkyl Methacrylate) and Tetrabromobisphenol-A(TBBA) Blend
Kim, Dong-Keun ; Shin, Bong-Sub ; Seul, Soo-Duk ; Sohn, Jin-Eon ;
Korean Chemical Engineering Research, volume 29, issue 6, 1991, Pages 693~693
The thermal degradation behavior of poly(alkyl methacrylate)and flame-retardant, tetrabromobisphenol-A(TBBA) mixture was analyzed using the Gel Permeation Chromatography(GPC), Infra-red Spectroscopy(IR), Gas Chromatography(GC) and Thermogravimetric Analysis(TGA) under nitrogen gas flow of 50ml/min at various heating rates ranging from 4 to
. The activation energy of thermal degradation in the mixture was determined using the Friedman method. The optimum thermal stabilization was obtained in PMMA/TBBA=95/5, PeMA/TBBA=97/3 and PBMA/TBBA=97/3 blend. At GPC analyses, the viscosity average molecular weight in the mixture was decreased slwoly with decomposition temperature. At IR analyses, the value of carbonyl index in the mixture was increased slowly with reaction time and temperature. The thermal degradation mechanism of poly(alkyl methacrylate) and TBBA mixture was observed to be main chain scission under nitrogen environment.
Zeolite-entrapped Rhodium Carbonyl Clusters
Lee, Tae-Jin ; Kim, Jang-Hee ; Kim, Yoon-Kap ;
Korean Chemical Engineering Research, volume 29, issue 6, 1991, Pages 701~701
Zeolite-entrapped rhodium carbonyl clusters were prepared by converting adsorbed
in the pores of zeolite Y made basic by treatment with
. In a strongly basic zeolite, entrapped rhodium carbonyl clusters were formed, and the catalyst was active for CO hydrogenation and selective for low-molecular-weight olefins and methanol. The catalyst was stable, operating at
and 20atm with
molar ratio 1 for more than two weeks with no significant loss in activity and selectivity. The catalytically active species are suggested to be rhodium carbonyl clusters trapped in the zeolite cages.
The Prediction of Binary Gas Mixture Adsorption Equilibria from Single Component Adsorption Isotherm
Cho, Chan-Hwi ; Lee, Han-Ju ;
Korean Chemical Engineering Research, volume 29, issue 6, 1991, Pages 709~709
This study is to predict adsorption equilibrium data for their binary gas mixture systems from pure gas adsorption data of
on zeolite 5A (Davison C-625). A nonlinear regression method and an optimization method were employed in the calculation of the parameters. The binary mixture adsorption data have been examined against values predicted by various models using regression parameters obtained from the single component isotherms. For these systems the W-VSM gave the best representation of the experimental data.
system formed an azeotropic mixture at 325.15K and 12.26kPa. Isosteric heat of adsorption for carbon dioxide, methane, ethane and propane were 10.79kcal/mol, 6.95kcal/mol, 9.2kcal/mol, 11.85kcal/mol, respectively.
Fuel Gas Encapsulation in Ion-Exchanged Zeolite A -II. Hydrogen Diffusion in Cs-A Zeolite-
Kim, Dong-Hyun ; Heo, Nam-Ho ; Kim, Jong-Taik ;
Korean Chemical Engineering Research, volume 29, issue 6, 1991, Pages 717~717
Hydrogen diffusion in Cs-A zeolite during temperature programmed decapsulation is studied. Fitting of experimental responses by the method of least squares is proposed for estimation of the diffusivity. Although a mathematical treatment provided a simple equation[Eq. (14)], which is analogous to the well known equation for temperature programmed desorption, for estimating the diffusivity, responses calculated with the diffusivity from Eq.(14)deviated significantly from experimental responses. The method of fitting allowed simultaneous estimation of the diffusivities into
, and the diffusivity of hydrogen into
were more then on hundred times larger than that into
The Onset of Thermosolutal Convection during Upwards Solidification
Hwang, In-Gook ; Choi, Chang-Kyun ;
Korean Chemical Engineering Research, volume 29, issue 6, 1991, Pages 727~727
The onset of thermosolutal convection during upwards solidification of a binary melt is investigated by using linear stability theory. The present study concerns the stabilizing effect of temperature on the onset of thermosolutal convection. The results show that the critical solutal Rayleigh number increases with increasing the thermal Rayleigh number. This reflects the fact that an increase in thermal Rayleigh number makes the system more stable, while the system becomes more unstable with an increase in Lewis number or schmidt number. Multicell convection is exhibited at onset condition and this thermosolutal convection is confined mainly to the vicinity of the interface. With increasing the thermal Rayleigh number, this trend becomes more pronounced with multicell patterns more distinguished.
Solvent Extraction of Tantalum and Niobium Using Mixer-Settler
Lee, Yong-Taek ; Jang, Hee-Dong ; Park, Kyun-Young ;
Korean Chemical Engineering Research, volume 29, issue 6, 1991, Pages 736~736
Using a pilot scale mixer-settler, a solvent extraction study was carried out on the extraction of tantalum and niobium with TBP(tributyl phosphate)as a solvent from the
system. The concentration of sulfuric acid in the feed solution was found to affect not only extraction yield of tantalum and niobium but also extraction behavior of the impurities. The experimental conditions were established to achieve a yield higher than 99% for the extraction of tantalum and niobium. To remove the impurities from the organic solution, scrubbing experiments were performed; the scrubbing was found effective under the conditions that the concentration of sulfuric acid is 9N and the ratio of the volumetric flow rate of the organic feed to that of the aqueous feed into the mixer-settler is 5. In the stripping of niobium from the organic solution, the phase separation was much easier with 1N
solution as a stripping medium than with water. finally, tantalum and niobium having a purity of 99.9%, respectively, were obtained using the pilot scale mixer-settler.
Equilibrium Partitioning for Hard-Sphere and Lennard-Jones Fluids inside Cylindrical Micropores
Suh, Soong-Hyuck ; Kim, Jong-Shik ; Park, Chan-Young ;
Korean Chemical Engineering Research, volume 29, issue 6, 1991, Pages 742~742
In this paper the grand canonical ensemble Monte Carlo calculations over a wide range of pore-size ration are carried out to evaluate equilibrium partition coefficients, solvation forces, and radial density profiles for model fluids distributing between an external bulk phase and a cylindrical pore phase with molecular dimension. the simulation results obtained from hard-sphere fluids confined within the cylindrical hard-wall pore are used to assess the applicabilities of various theoretical approximations including the virial expansion equation and the extended one-dimensional hard-rod prediction. In addition, Lennard-Jones fluids inside the structureless soft-wall pores are also computed to investigate the influence of adsorption force field on the thermodynamic and structural properties.
Comments on the Kinetic Study with Thermogravimetric Analyzer : Case Study of Coal, Tire and Plastic Pyrolyses
Ghim, Young-Sung ;
Korean Chemical Engineering Research, volume 29, issue 6, 1991, Pages 752~752
A method to know how much the thermogravimetric data are close to the Arrhenius-type rate equation was suggested. By using this method, pyrolysis of lignite that did not soften or swell with increasing temperature was proved to be well explained with the Arrhenius-type rate equation. On the other hand, pyrolyses of thermoplastics such as PS were far from the Arrhenius-type rate equation due to the significant melting and swelling with increasing temperature. Pyrolytic propensity of tire chips was between those of lignite and thermoplastics but was still distant from that expected by the Arrhenius-type rate equation.