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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
Editor in Chief :
Volume & Issues
Volume 32, Issue 6 - Dec 1994
Volume 32, Issue 5 - Oct 1994
Volume 32, Issue 4 - Aug 1994
Volume 32, Issue 3 - Jun 1994
Volume 32, Issue 2 - Apr 1994
Volume 32, Issue 1 - Feb 1994
Selecting the target year
A Study on the Air Separation Properties of Multilayer Composite Membranes
Ryu, Young-Ki ; Jeon, Gui ;
Korean Chemical Engineering Research, volume 32, issue 5, 1994, Pages 627~627
Multilayer types of thin film composite(TFC) membranes were prepared. Poly(dimethylsiloxane)and poly-4-methyl-1-pentene were used as a coating material and polysulfone was used for a porous support membrane. Permeation data of oxygen and nitrogen through TFC membranes at different pressure and thickness ratio of coating layer were obtained and the relationship between structure of membranes, permeability and selectivity were analyzed by applying resistance model. The values of permeability coefficient and ideal separation factor predicted by resistance model were well fitted with the experimental data. Oxygen was enriched up to 34.5% in the permeate stream under the condition that pressure difference and cut were
and 0.05 respectively. The ideal separation factor of this three-layer TFC membrane was 3.4 and the permeability of oxygen was
Thermophysical Properties Prediction of Polar Halocarbons by the BWRS Equation of State Based on Four-Parameter Corresponding-States Principle
Lee, Tae-Jong ; Lee, Hyoung-Yong ;
Korean Chemical Engineering Research, volume 32, issue 5, 1994, Pages 636~636
A four-parameter corresponding-states-principle framework has been employed to improve the thermophysical properties prediction of the polar halogenated hydrocarbons(halocarbons). The equation of state used here is the Benedict-Webb-Rubin-Starling(BWRS) equation. Reduced dipole moment is considered as the fourth parameter. And its constants have been generalized. The newly developed correlation with the generalized constants exhibits improved predictions of density, enthalpy and especially vapor pressure for halocarbons with high dipole moment without a sacrifice of predictability on low polar halocarbons.
and NO by Dry Sorbent
Shin, Chang-Sub ;
Korean Chemical Engineering Research, volume 32, issue 5, 1994, Pages 644~644
This paper describes a work based on the new concept of integrated pollutant control : a cross flow filter comprised of layered and gas permeable monolith that acts simultaneously as a
reduction catalyst and a particle filter.
was used as a regenerable sorbent-catalyst material and it provided high performance for
removal efficiency, sulfur capacity and sorbent regeneration. The activity of NO reduction increased with sulfation of Cu-7Al and with its surface area. Methyl cellulose turned out to be a good binder.
Kinetics of Grafting Reaction in Poly(n-butyl acrylate)-Poly(methyl methacrylate) Core/Shell Emulsion Polymerization
Park, Eung-Sik ; Park, Young-Jun ; Hwang, Tae-Won ; Kim, Jung-In ; Kim, Jung-Hyun ;
Korean Chemical Engineering Research, volume 32, issue 5, 1994, Pages 651~651
Latex particles which consist of poly(n-butyl acrylate)[p(n-BuA)] core and poly(methyl methacrylate)[PMMA] shell were prepared by two stage emulsion polymerization and the grafting efficiency(GE) of these latex particles was determined by the solvent extraction method. Kinetics of emulsion polymerization was applied to the grafting reaction and the grafting efficiency was calculated from the kinetic expression. The calculated result showed similar trend to the experimental values. The approximate value of the grafting reaction constant was obtained using this method.
Computer Simulation Model for the Analysis of Microstructural Changes during Particle Deposition
Kim, Hern ; Rajagopalan, Raj ;
Korean Chemical Engineering Research, volume 32, issue 5, 1994, Pages 659~659
A Monte Carlo simulation model was developed to investigate the changes of microstructures and their properties such as packing fraction during the deposition of hard-sphere particles. As a major parameter Peclet number was used to analyze the effects of particulate systems and process conditions. The optimum conditions where the deposits form ordered structures, the dynamic phase behavior, the effects of initial volume fraction, the size fractionation of polydisperse particles, and so on were also examined. It was noted that a number of results predicted from the present model are in good qualitative agreement with experimental observations. The present model can be used as a simple and effective tool for designing a number of related experimental studies.
The Extraction of Effective Metal Components from Deep-Sea Manganese Nodule by the Decomposition with Ammonium Sulfate
Lee, Chul-Tae ; Oh, Chi-Hoon ; Song, Yeon-Ho ; Um, Myeong-Heon ;
Korean Chemical Engineering Research, volume 32, issue 5, 1994, Pages 667~667
A reaction between deep-sea manganese nodule and
was carried out to find a new process for the extraction of manganese, cobalt, nickel and copper from deep-sea manganese nodule. Manganese nodule was decomposed with ammonium sulfate successfully and the effective components in manganese nodule such as manganese, cobalt, nickel and copper were extracted by water leaching of decomposed nodule. The optimum conditions of decomposition were as follows : the reaction temperature
weight ratio manganese nodules 4.0, the reaction time 60 min. The proper conditions of water leaching of decomposed nodule were as follows : the leaching temperature
, the leaching time 2 hr, amount of
200 ml. Under above conditions, manganese, copper, covalt and nickel in the nodule were extracted 99%, 99%, 93%, 90%, respectively.
A Mathematical Model for Bed Expansion in an Inverse Fluidized Bed
Kim, Dong-Seog ; Park, Young-Seek ; Choo, Suck-Ruel ; Song, Seung-Koo ;
Korean Chemical Engineering Research, volume 32, issue 5, 1994, Pages 680~680
Fourteen different styrofoams having diameter range from 0.0965 to 0.1219cm and density range between 0.2 and
were used to investigate bed expansion characteristics in a inverse fluidized bed. Two models for predicting bed expansion were examined and compared with the experimental data. The expansion index, n, was little difference between the predicted values from the two models and the measured values. In the view of
, the predicted values of the two models were well agreed with the experimental data. Model 2 could be more concisely applied to predict the bed expansion without restriction of
Effectiveness Factor for Porous Gas Diffusion Electrode
Suh, Sung-Sup ; Roh, Je-Seung ; Ju, Jeh-Beck ; Nam, Suk-Woo ; Lim, Tae-Hoon ; Oh, In-Hwan ; Hong, Seong-Ahn ;
Korean Chemical Engineering Research, volume 32, issue 5, 1994, Pages 686~686
Effectiveness factor which was defined as the ratio of the current produced by the electrode under diffusional resistance to that produced by the electrode without diffusional resistance was investigated for porous gas diffusion electrode described by agglomerate model. System variables including reaction rate, diffusion coefficient, and agglomerate size were combined into three dimensionless parameters, and their effects on effectiveness factor were studied. Effectiveness factor reaches a maximum value with a critical electrode thickness.
Excess Molar Volumes for the Systems Cyclohexane-Alcohol at 298.15 K
Park, So-Jin ; Oh, Jong-Hyeog ;
Korean Chemical Engineering Research, volume 32, issue 5, 1994, Pages 693~693
Solution behavior of liquid mixtures are depend on the interactions of constituent molecules in solution, excess molar volume
is therefore very important in the thermodynamic design as well as understanding the relation between constituent components. In this work, excess molar volumes have been measured for binary mixtures of cyclohexane-alcohol
at 298.15 K by using digital vibrating tube densimeter. Excess molar volume values show positive deviation from the ideality in all the measured cyclohexane-alcohol systems and expecially cyclohexane-methanol mixture has immiscible region. Experimental data were fitted with 6 parameter Redlich-Kister equation, and their standard deviations
, from the experimental data were less than
into Aliquat 336-Diphenylmethane Heterogeneous System
Park, Sang-Wook ; Suh, Dong-Soo ;
Korean Chemical Engineering Research, volume 32, issue 5, 1994, Pages 700~700
The absorption of oxygen into the benzene solution of diphenylmethane with Aliquat 336 as a phase transfer catalyst and potassium tert-butoxide as a base was carried out using a stirred absorber at
and an atmospheric pressure. The reaction rate constants,
and equilibrium constant,
, between the intermediate of catalyst and base, and reactant were obtained from the absorption rate of oxygen, and their value were
s, 3.33 and
, respectively. The reaction mechanism by the phase transfer catalyst in the gas-liquid-solid heterogeneous system could be analyzed by mass transfer mechanism with chemical reaction using the film theory.
Hydrocracking of Vacuum Residue on CoMo/Silica-Alumina Catalysts Mixed with Zeolite
Choi, Jin-Woo ; Choi, Woo-Suk ; Lee, Kyoung-Hwan ; Ha, Baik-Hyon ;
Korean Chemical Engineering Research, volume 32, issue 5, 1994, Pages 708~708
The catalysts of CoMo/silica-alumina and those mixed with steamed HY and H-mordenite were used for hydrocracking of a vacuum residue in a high-pressure batch reactor. The catalysts were characterized by temperature-programmed desorption of ammonia and nitrogen adsorption. The catalysts containing the zeolite had the more acid sites and two kinds of pore size: macropore(about
) of silica-alumina and secondary pore(about
) of the zeolite. The catalyst containing HY improved the cracked yield and selectivity of light oil
. However, the catalyst containing the H-mordenite which have not a secondary pore showed lower activity, but slightly increased the conversion of asphaltene than that with HY. Therefore, the primary cracking of vacuum residue occurred in the large pore of silica-alumina and then cracking continued in the secondary pore of zeolite and finally in zeolite micropore. It was found in conclusion that the control of the secondary pore in zeolite played a important role in the hydrocracking of the vacuum residue.
Convective Instabilities of the Melt during Solidification Cooled from Below
Hwang, In-Gook ; Choi, Chang-Kyun ;
Korean Chemical Engineering Research, volume 32, issue 5, 1994, Pages 718~718
When a crystal layer grows from the cooling boundary, the solid-liquid interface moves and the concentration profile evolves with time. In this Stefan-type solidification problem, convective instabilities of the melt were analysed numerically by using the propagation theory. It was found that the onset time of compositional convection increased with increasing the non-dimensional growth rate
which is an important factor governing the instabilities of the melt during solidification. The local critical Rayleigh number
having the length scale of the concentration boundary-layer thickness decreased with increasing
. For small values of
, was strongly dependent upon
, while for large values of
, its effect was not significant. The present theoretical results were compared favorably with existing experimental results of aqueous ammonium chloride solution.
Effects of Surfactants on Oxidation of Ferrous Iron by Thiobacillus ferrooxidans
Ryu, Hee-Wook ; Lee, Tae-Ho ; Chang, Yong-Keun ; Kim, Sang-Done ;
Korean Chemical Engineering Research, volume 32, issue 5, 1994, Pages 726~726
Influences of a number of surfactants on the oxidation of ferrous iron by Thiobacillus ferrooxidans were investigated. The goal was to select appropriate surfactants for a microbial coal desulfurization process. Anionic surfactants such as CWM 1001(polymer sulfonate Na salt), CWM 1002[formaldehyde condensate of sodium naphthalene sulfonate (n=4-5)], and CWM 1102 [formaldehyde condensate of sodium naphthalene sulfonate(n=10-20)] strongly inhibited the oxidation of ferrous iron to ferric iron by T. ferrooxidans. Most of the surfactants tested slightly promoted the oxidation at low concentrations of 10-100 ppm, but significantly inhibited as increasing their concentrations. Other anionic surfactants such as CWM 1104(formaldehyde condensate of sodium naphthalene sulfonate, n=1) and CWM 1105 (sodium polyacrylate), and a nonionic surfactant, TW 1020(polyoxyethylene sobitaneoleate), up to 1,000ppm either had no effect on or slightly promoted the oxidation. The oxidation rate of ferrous iron was slightly reduced when a nonionic surfactant, Monopol NP1060(nonylphenol ethylene oxide adduct), was added over 500 ppm. These surfactants, CWM 1104, CWM 1105, TW 1020, and NP1060, were found to be used to improve the fluidity of coal slurry in a microbial coal desulfurization process with no harmful effects.
Ethanol Dehydration by Evaporation and Diffusion in an Inert Gas Layer
Chung, In-Sick ; Song, Kyu-Min ; Hong, Won-Hi ; Chang, Ho-Nam ;
Korean Chemical Engineering Research, volume 32, issue 5, 1994, Pages 734~734
Ethanol dehydration of azeotropic mixture was performed by using diffusion distillation apparatus consisting of a wetted-wall column with two concentric tubes. Ethanol-water mixtures evaporated below the boiling point was separated during the diffusion through the gap filled with an inert gas. As the temperature difference between evaporation part and condensation part was increased, the total flux increased but the selectivity decreased. The effect of the annular width on the selectivity was not significant but the total flux was decreased with decreases in the annular width. Inert gas has an effect on the diffusivity of evaporated gas components. The total flux in case of helium as inert gas was larger than that in case of air but the selectivity in case of using helium was lower.
Manufacture of PAC(Polyaluminum Chloride) by Partial Decomposition of Aluminum Chloride Hexahydrate
Park, Kyun-Young ; Lee, Kyu-Chul ; Kim, Jin-Kwon ;
Korean Chemical Engineering Research, volume 32, issue 5, 1994, Pages 742~742
Presented is a new method of manufacturing PAC(polyaluminum chloride) used as flocculant for water treatments : PAC is obtained through partial decomposition of aluminum chloride hexahydrate at
to give basic aluminum chloride followed by dissolving the basic chloride in water. With varying the extent of decomposition, properties of the solid-state basic chloride and the PAC solution were analyzed. The IR analysis showed that at an extent of decomposition of 33.4% an absorption band appeared at
indicating the formation of basic aluminum chloride. The basicity of the PAC solution was observed to increase with increasing the extent of decomposition. In order to meet the basicity of 45% required for commercial grade PAC, it was found necessary to have an extent of decomposition higher than 45%. According to the NMR analysis, both
monomer and aluminum chloride polymers were present in the PAC solution. The molar ratio of the polymers to the monomer increased with an increase in the extent of decomposition. The PAC manufactured by the present method was tested on the water taken from the Kum river.