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REFERENCE LINKING PLATFORM OF KOREA S&T JOURNALS
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Korean Chemical Engineering Research
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Journal DOI :
The Korean Institute of Chemical Engineers
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Volume & Issues
Volume 36, Issue 6 - 00 1998
Volume 36, Issue 5 - 00 1998
Volume 36, Issue 4 - 00 1998
Volume 36, Issue 3 - 00 1998
Volume 36, Issue 2 - 00 1998
Volume 36, Issue 1 - 00 1998
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Combustion Behavior of Pulverized Coal in Coke Bed Furnace
Choe, Tae Hwa ; Jeong, Seok Gwang ;
Korean Chemical Engineering Research, volume 36, issue 1, 1998, Pages 1~1
A fundamental investigation on combustion behavior of pulverized coal has been carried out by using the coke bed experimental furnace. In this furnice, experiments are executed with varing of the oxygen enrichment methods, the position of the coal injection lance, coal brends etc. The coal combustibility of the oxy-coal system that the oxygen was injected with the coal through the oxy-coal lance was about 10 % higher than that of the conventional oxygen enrichment method that the oxygen was enriched in the hot stove. However, when the oxygen content of hot blast was higher than 25 %, the maximum gas temperature in the raceway zone was decreased and combustibility of coal was not increased greatly.
Extraction Characteristics of Gases Dissolved in Insulating Oil in a Bubble Column
Nam, Chang Hyeon ; Lee, Tae Won ; Gang, Yong ;
Korean Chemical Engineering Research, volume 36, issue 1, 1998, Pages 8~8
Extraction characteristics of gases dissolved in insulating oil have been investigated in a batch type bubble column. Effects of the volume ratio of insulating oil to freeboard in the bubble column, gas velocity, liquid viscosity and bubbling time on the concentraction of gases extracted from the insulating oil have been determined. The results can be utilized to obtain the important informations on the design of bubble column extractor as well as the development of fault diagnosis technology for the electric transformers.
A Mathematical Model for the Optimization of the Cigarette Quality
O, In Hyeok ; Byeon, Yun Seop ; Jeong, Gyeong Rak ;
Korean Chemical Engineering Research, volume 36, issue 1, 1998, Pages 14~14
The mathematical models have been developed to calculate the cigarette weight and to optimize the qualities of cigarette affected by fluctuations of filling power on the control system of the cigarette maker. Even if Wochnowski’s model of these is useful in practice, it has the mathematical faults. Therefore, in this paper we have developed the improved model and applied it to the control system of the cigarette maker. This new model is very useful enough to optimize the cigarette weight and to minimize the variation of the cigarette qualities by the fluctuations of filling power.
A Study on the Effect of Dye Properties on Decolorization of Acid Dye Wastewater with Coagulants
Han, Tae Seong ; Yun, Hyeon Hui ; Kim, Byeong Sik ;
Korean Chemical Engineering Research, volume 36, issue 1, 1998, Pages 20~20
In order to study decolorization of wastewater from a dyeing house, the properties of acid dyes, such as zeta potential, iso-electric point, solubility, partial charge, and neutral dyeingability, were measured and the effect of those properties on coagulation and decolorization was investigated. The coagulants used in this study were aluminium sulphate as an inorganic coagulant and dicyandiamide as an organic coagulant. Coagulation and decolorization rates of coagulants for acid dyes were increased with neutral dyeingability for polyamide. Decolorization effect of the inorganic coagulant for milling-type acid dyes was excellent while the effect for levelling-type acid dyes was poor. The organic coagulant for acid dyes also showed an excellent decolorization rate of more than 97 % except amphoteric levelling-type acid dyes such as C. I. Acid Red 52 and Acid Blue 7.
Selective Separation of Testosterone using Biofunctional Polymer
Korean Chemical Engineering Research, volume 36, issue 1, 1998, Pages 27~27
The molecular imprinting technique(MIT) was used in synthesis of biofunctional polymers having affinity of steroid, especially high affinity for testosterone. This MIT method was developed based on the covalent bonding using the methacrylate ester and non covalent interaction such as hydrogen bonding and ionic interaction. Using a suite of similar steroids we were able to identify features of the molecules which affect their affinity for the polymer matrix. As a result, hydrogen bonding formed between OH group and carboxyl group was known as the dominant bonding. In case of the covalently imprinted polymer, it was investigated about the degree of the hydrolization used in order to remove the template being inside the polymer matrix. We were able to know a diminution of the capacity factor in case of doing hydrolization for 12 hrs. The polymer obtained(non-covalently imprinted) was found to interact specifically with testosterone(capacity factor; 5.10), while the other steroids under study(estrone, progesterone, testosterone propionate and β-estradiol) were eluded closely to the void volume in the HPLC experiments(capacity factor; 0.53-1.52). The mixture of testosterone and other steroids was shown to be separated by the imprinted polymer with near baseline resolution.
Application of Catalytically Grown Carbon Nanofiber in Double Layer Capacitor (I) -Preparation and Properties of Carbon Nanofiber-
Kim, Myeong Su ; Kim, Do Yeong ;
Korean Chemical Engineering Research, volume 36, issue 1, 1998, Pages 34~34
In order to establish the reaction conditions for producing carbon nanofibers by passing a commercial propane gas over Cu-Ni and Ni catalysts, the experimental conditions such as catalyst composition, reaction temperature and gas flow rate were varied. It was observed by SEM that the obtained carbon deposits were mainly composed of carbon nanofibers with the diameters ranging 50-300 nm. The carbon yield and structure were dependent on the catalyst composition and reaction temperature. The maximum yields of carbon nanofibers from propane decomposition were obtained at temperatures from 650 to 700℃ and the higher yields were obtained over the alloy catalysts containing 50-90 wt% nickel than the pure nickel catalyst. The specific surface area and electric resistivity were measured as the key properties for the electrode application of a double layer capacitor(DLC). The carbon nanofibers from Cu-Ni catalyst had relatively high surface areas of around 350 m2/g, while those from Ni catalyst showed about 150 m2/g of surface areas. The electrical resistivity was also dependent on the catalyst composition, raging 0.05-0.25 Ω·cm and these values were much lower than those for activated carbon which is currently used as the electrode materials.
Models for Mathematical Analysis of Gas-Liquid Reaction Crystallization of Calcium Carbonate in Couette-Taylor Reactor
Lee, Sang Gu ; Kim, Min Chan ; Kim, U Sik ; Choe, Chang Gyun ;
Korean Chemical Engineering Research, volume 36, issue 1, 1998, Pages 42~42
The mathematical modeling of crystallization of calcium carbonate which is formed by the reaction of gaseous carbondioxide and liquid calciumhydroxide in Couette-Taylor crystallizer is conducted. Couette-Taylor crystallizer is modeled by PFR and series-MSMPR crystallizer. For each case, population balance and mass balance is derived. The population balance of PFR gives 1st order partial differential equation. This equation is discretized by finite difference method and is solved explicitly. The ordinary differential equations which are derived in modeling is solved by DGEAR subroutine of IMSL library. The particle size distribution of series-MSMPR model is more wide than that of PFR model and mean particle size is larger than that of PFR model.
Effect of Agitation on Gas-Liquid Reaction Crystallization of Calcium Carbonate in an MSMPR Reactor
Lee, Sang Gu ; Jeong, Wang Mo ; Kim, U Sik ; Choe, Chang Gyun ;
Korean Chemical Engineering Research, volume 36, issue 1, 1998, Pages 49~49
Experimental investigation of the agitation effect on crystallization of calcium carbonate, which was produced by gas-liquid reaction of CO2 and Ca(OH)2 in a Rushton-type MSMPR reactor, was carried out. The volume fraction distribution of calcium carbonate produced was bimodal and the crystal population distribution showed two straight lines on a semi-log plot. These phenomena on distributions of crystal volume fraction and crystal population were supposed to be due to size-dependent growth process of calcium carbonate crystals. With increasing the agitation speed, the crystal growth rate of calcium carbonate increased, but the crystal birth rate of calcium carbonate decreased. From XRD and microscopic studies, the present calcium carbonate crystals were revealed as cubic calcite.
Desorption Characteristics of MEK and Toluene from Activated Carbon Fiber by Supercritical Carbon Dioxide
Ryu, Yeong Gi ; No, Deok Su ; Lee, Chang Ha ;
Korean Chemical Engineering Research, volume 36, issue 1, 1998, Pages 56~56
The activated carbon fiber loaded with toluene and MEK was regenerated by supercritical carbon dioxide. And, the effect of temperature(308-333 K), pressure(185-250 atm) and density(0.690-0.902 g/cm3) on the regeneration efficiency were studied. It was observed that the operations at higher pressure were more favorable for regeneration, but the optimal operating temperature was 318 K at every pressure condition. However, at the same density, the regeneration efficiency was increased with temperature. In case of MEK/toluene mixture, the difference in the desorption rate and amount between both materials was decreased as the pressure was increased. The regeneration efficiency was predicted by using a one-parameter mathematical model assuming linear desorption kinetics. The predicted value was found to match the experimental data well. The desorption activation energies of activated carbon fiber adsorbed by toluene were close to the literature values of an activated carbon. The activation energy showed a smaller value at higher pressure.
Hydrogen Production during the Desulfurization of Petroleum Cokes with Molten Caustic Leaching
Lee, Si Hun ; Park, Ju Sik ; Im, Yeong Jun ; Son, Eung Gwon ;
Korean Chemical Engineering Research, volume 36, issue 1, 1998, Pages 62~62
Partial gasification during the desulfurization with molten caustic from high sulfur(>6 %) petroleum coke was investigated. The results show that the hydrogen of purity more than 96% was evolved with 1.4 liter/g coke at the treatment condition of 550℃, and caustic to coke ratio four. This amount was 1.5 times larger than the evolved hydrogen from low sulfur bituminous coal. Larger amount of hydrogen evolved from high sulfur petroleum cokes was due to the activated site produced during the desulfurization process and its participation to the hydrogen production. The amount of evolved hydrogen was proportional to the caustic to coke ratio and the gas evolution rate to the temperature.
Ions on Pitch-Based ACF from Aqueous Solution
Sim, Jae Un ; Lee, Sang Mun ; Yu, Seung Gon ;
Korean Chemical Engineering Research, volume 36, issue 1, 1998, Pages 68~68
The adsorption characteristics of Cr(VI), Cu(II) and Ni(II) ions on ACF are investigated from aqueous solutions of various pHs at 25℃, 240 rpm and 24 hr. The adsorption of Cr(VI) on ACF in mixture with Cu(II) and Ni(II) shows the same trend as that in single component, while its amount of adsorption is decreased. Distribution diagrams of metal species indicate that Cu(II) and Ni(II) are positively charged ions below pH 7, and at pH<3 only Cr(VI) is adsorbed, whereas at pH>3 Cu(II) and Ni(II) are main metal species adsorbed. It is in the pH 4-5 where the total amount of adsorption of metal ions shows the largest value.
Effect of Periodic Operation on Hydrogenation of Carbon Dioxide
Kim, Gyeong Gu ; Nam, Yeong U ;
Korean Chemical Engineering Research, volume 36, issue 1, 1998, Pages 73~73
Catalytic hydrogenation of carbon dioxide over Ni/SiO2 catalyst in a fixed-bed reactor was studied by varying the reaction temperature, space velocity, and mole fraction of the feed. Space velocity under 300 cm3/min·g-cat had no effect on the conversion of CO2. Conversion of CO2 increased and approached to the equilibrium conversion as the reaction temperature increased. There was no optimum fled composition for maximum COE conversion. Keeping the average feed composition in periodic operation with stoichiometric ratio of methanation reaction(H2/CO2=4), effect of cycle splits and periods of feeding cycle were studied. In periodic operation, conversion of CO2 and selectivity of methane were lower than those of steady state runs. However, selectivity to CO increased by periodic operation. Cycle period resonance of CO2 conversion was observed.
Effects of PCO₂ on Substrate Compositions in Anaerobic Digestion
Kim, Yeong Cheol ; Lee, Mu Gang ;
Korean Chemical Engineering Research, volume 36, issue 1, 1998, Pages 78~78
Effects of carbon dioxide partial pressuree(PCO2) and substrate compositions on the bacterial population, methane production rate and matter degradation in anaerobic digestion were investigated by using anaerobic chemostat type reactors at 35±1℃, at the HRT of 7 days. Two kinds of single substrate containing carbohydrate and protein, and mixed of these were used in this study. At PCO2 of 0.5 atm, the specific methane production rate and specific substrate removal rate reached the maximum rates at the protein substrate reactor. At PCO2 of 0.5 atm, the methane production rates in the reactors fed by carbohydrate, protein and mixed substrate were 20%, 29% and 26% higher than those obtained under the controlled condition, respectively. The number of acetate consuming methanogenic bacteria enumerated by the MPN(most probable number) method, decreased when PCO2 exceeded 0.7 atm. Hydrogen consuming methanogenic bacteria and homoacetogenic bacteria increased as PCO2 increased from 0.1 to 0.6 atm, however, decreased slightly at PCO2 above 0.7 atm. The number of hydrolytic bacteria, sulfate-reducing bacteria and H2-producing acetogenic bacteria were not much influenced by the change of PCO2. The potential methanogenic activity reached the maximum at PCO2 0.5 atm, however, decreased significantly when PCO2 exceeded 0.7 atm. It was considered that the inhibition of specific methane production rate at PCO2 above 0.7 atm would depend on free CO2 concentration in solution.
Modeling and Analysis of an EVA Copolymerization Reactor
Ham, Jae Yong ; Lee, Hyeon Gu ;
Korean Chemical Engineering Research, volume 36, issue 1, 1998, Pages 85~85
The free radical copolymerization reactor of the ethylene and VA is operated under the conditions of high pressure and temperature. In this study, a two-compartment four-cell model is used to describe the behavior of the adiabatic autoclave reactor for the EVA bulk copolymerization reaction. The parameters for various reaction rate constants are determined by analyzing the free radical and ethylene decomposition reaction mechanisms and associated data adopted in many studies. The bifurcation diagrams are constructed to investigate systematically the effects of various operation parameters on the reactor performance, and the feasible operating regions are analyzed. The overall structure of the steady states of the reaction system is examined by organizing the bifurcation set by two-parameter continuation method. The strategy for the production rate increase is also proposed by elucidating the relationship between the reactor performance and the molecular weight.
Oxidation Characteristics of Phenol-based Waste Water by Supercritical Water
Jeong, Seung Nam ; An, Sang Hun ; Yu, Gi Pung ; No, Min Jeong ; Han, Ju Hui ; Han, Seung Ho ;
Korean Chemical Engineering Research, volume 36, issue 1, 1998, Pages 92~92
Supercritical water oxidation characteristics of aqueous phenol solution(500 ppm) was experimentally evaluated using a stainless steel 316 tubular-type reactor(0.21 cm ID x 34 cm L). The orders of reactions and rate constants with respect to the concentration of phenol, oxygen and water were determined under various oxidation conditions(i.e., temperatures : 300-440℃, pressures : 180-290 bar, percent of excess amount of oxygen : 0, 300, 600, 800 %, mean residence time : 0.7-11 sec). The conversion of phenol was linearly proportional to the residence time. For example, more than 90 % of phenol was oxidized at the residence time of 5 sec. Within the experimental conditions, the orders of oxidation with respect to phenol and oxygen concentrations were 1 and 0.437±0.027, respectively. Reaction order of water was proportional to density at constant temperature and pressure, and it was 0.653±0.027. The activation energy for the oxidation reaction at 240 bar and 300-440℃ was 18.31 kcal/mol.
Prediction of Mixing Degree of Binary System with Different Density in a Fluidized Bed
Jang, Hyeon Tae ; Hong, Seong Chang ; Do, Dong Seop ;
Korean Chemical Engineering Research, volume 36, issue 1, 1998, Pages 98~98
The profile of pressure difference and mixing degree were investigated with binary system of different density using PMMA(poly methyl methacrylate) and sand(or manganese ore) in a 0.109 m I.D. gas fluidized bed. This study is carried out the systems jetsam rich system and flotsam rich system. A study on mixing-segregation phenomena was performed by the analysis of the profile of pressure difference, and the results were confirmed with mixing degree using sieve test. It was found that the take-over velocity was obtained from the value of specific gas-velocity which observed by transition of the slope in a pressure differences profile. The mixing degree is related with variation of the bed pressure difference measuring height of axial position according to gas velocity.
Adsorption Equilibria and Enthalpy of Adsorption for Ammonia-Metal Chloride System
Gang, Seong Mo ; Lee, Se Il ; Kim, Seong Hyeon ; Lee, Cheol Su ;
Korean Chemical Engineering Research, volume 36, issue 1, 1998, Pages 105~105
Adsorption equilibria for ammonia-expanded graphite impregnated with manganese chloride and nickel chloride systems were experimentally studied. The equilibria were modelled by a two-patch heterogeneous system in which each homogeneous patch was described by the Fowler-Guggenheim adsorption isotherm. A method was also developed for calculation of adsorption enthalpy from the isotherm information. The model was found to approximately describe the adsorption isotherm and enthalpy.
A Temperature Swing Adsorptive Reactor for the Enhancement of Catalytic Dehydrogenation Reaction
O, Min ; Jang, Ui Jong ; Mun, Je Gwon ;
Korean Chemical Engineering Research, volume 36, issue 1, 1998, Pages 109~109
Based on temperature swing concept arising from forced periodic variations in feed conditions, a theoretical study of a novel catalytic reactor system is carried out, in which adsorption and reaction occur simultaneously. In order to evaluate the performance of a temperature swing adsorptive reaction(TSAR) process for various operating conditions, the rigorous dynamic model of the reactor is developed and dynamic simulation is performed. In the application of the concept suggested in this paper, the dehydrogenation process of methyl-cyclohexane(MCH) to produce toluene is employed and the conversion and energy consumption is calculated. The results are compared with the case of isothermal equilibrium reaction. For the whole range of investigation, it is examined TSAR process is superior to an isothermal equilibrium reactor in the sense of a convection and energy saving. In the consideration of the results of this study, TSAR process can provide a means for the effective utilization of a waste heat source for reaction heat and for feed gas preheat; periodic catalyst regeneration; the generation of optimal temperature for the improvement of a conversion; and reaction enhancement for theoretically limited reactions.
Photocatalytic Activity of Anatase Titania Particles of Controlled Size Prepared in an Aerosol Reactor
Kim, Gi Yeong ; Park, Seung Bin ;
Korean Chemical Engineering Research, volume 36, issue 1, 1998, Pages 116~116
The anatase titania particles of 26 to 90 nm in diameter were prepared by thermal decomposition of titanium tetraisopropoxide(TTIP) in an aerosol reactor, and the effect of catalyst size on the photocatalytic degradation of trichloroethylene(TCE) was examined. The UV absorbance of titania particles was blue shifted as the particles size was decreased. The initial removal rate of TCE on the UV lamp with the average wave length of 350nm was increased from 1.5×10-6 to 3.5×10-6(mole TCE/m2 min) as the particle size increased.
Excess Molar Volumes of Binary and Ternary Mixtures of Water, Acetic Acid and Ethylene Glycol
Bae, Hyo Gwang ; Song, Hyeon Chang ; Lee, Jae Uk ;
Korean Chemical Engineering Research, volume 36, issue 1, 1998, Pages 120~120
The excess molar volumes of Water+Ethylene Glycol binary mixture at 313.15 K, Acetic Acid+Ethylene Glycol binary mixture at 283.15 K, 293.15 K, 303.15 K, 313.15 K and Water+Acetic Acid+Ethylene Glycol ternary mixture at 283.15 K, 293.15 K were measured by using a vibration tube densimeter. The binary data were correlated to the Redich-Kister polynomials and the excess volumes of ternary system were estimated by utilizing the parameters regressed from the experimental excess volumes of the binary ann ternary mixtures.