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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 26, Issue 6 - Dec 1988
Volume 26, Issue 5 - Oct 1988
Volume 26, Issue 4 - Aug 1988
Volume 26, Issue 3 - Jun 1988
Volume 26, Issue 2 - Apr 1988
Volume 26, Issue 1 - Feb 1988
Selecting the target year
Crystallization Rates of AUC by Semi-Batch Operations
Park, Myung-Hae ; Rhee, Bo-Sung ;
Korean Chemical Engineering Research, volume 26, issue 6, 1988, Pages 553~553
The crystallization rates of AUC(Ammonium Uranyl Carbonate) by semi-batch operations in the slab-type precipitator were studied. From the moment transformation of population balance equation and the experimental data of particle size distributions secondary, effective nucleation and growth rates were obtained. These rate laws were determined as a concentration term of uranium in mother liquor or slurry. Particularly, the population densities of smaller particles than
were high due to attrition of large particles during circulation by the centrifugal pump.
Heterogeneous Catalytic Partial Oxidations of Methylcyclopentane, Cyclopentane and Cyclopentadiene on V-Mo-P Mixed Oxide Catalysts
Lee, In-Wha ; Tae, Beom-Suk ; Hong, Suk-In ;
Korean Chemical Engineering Research, volume 26, issue 6, 1988, Pages 562~562
The effects of calcination temperature and calcination time of V-Mo-P catalyst on the catalytic activity and selectivity of maleic anhydride were investigated.
were dissolved in oxalic acid solution as active components and impregnated on
(anatase). The prepared catalysts were calcined at
varing from 5 to 30 hours and for 20 hours varing temperature from
. All the catalysts were characterized by surface area, XRD, SEM-EPMA, image analysis and thermal analysis. From the techniques of optical microscopy, such as image analysis and SEM-EPMA, it was confirmed that the particle of alumina grew as the calcination temperature increased. And the XRD results also confirmed that the calcination time had not affected the crystalline structure of catalyst but APM was decomposed to molybdenum oxide and phosphorous oxide at
of calcination temperature. Through the fixed bed reaction, maleic anhydride was produced mainly from all reactants and phthalic anhydride, citraconic anhydride, carbon monoxide and carbon dioxide were produced as by-products. As the calcination time increased, the activity decreased mainly due to the reduction of surface area of catalyst. The higher calcination temperature gave the lower activity. Over the
the activity decreased significantly. And the selectivity of MA increased up to
of calcination temperature but decreased rapidly over
of calcination temperature. The best calcination conditions in this study were temperature of
and time of 20 hours, respectively.
The Enrichment of Lithium Isotopes by Elution Chromatography
Kim, Dong-Won ; Kim, Kong-Soo ; Song, Hae-Yeong ; Yang, Jae-Ho ; Kim, Tae-Seung ;
Korean Chemical Engineering Research, volume 26, issue 6, 1988, Pages 571~571
Elution chromatography with Dowex 50w-x8, 200-400 mesh, strongly acidic cation exchanger was used for the separation of lithium isotopes. The separation factor,
was increased with increasing distribution coefficient,
, and not dependent on the pH of eluents. And the optimum value of distribution coefficient to separate lithium isotopes was about 30. At the same distribution coefficient, the separation factor was increased with the number of coordination site of eluents, or charge number of eluting cations.
was concentrated in the liquid phase and
in the resin phase.
Adsorption Characteristics of Organic Substances by Korean Activated Carbon
Lee, Byeong-Seon ; Ha, Gi-Seong ; Kim, Ju-Bong ;
Korean Chemical Engineering Research, volume 26, issue 6, 1988, Pages 583~583
To obtain the basic engineering data such as equilibrium relationship and intraparticle diffusion coefficients for the design of activated carbon treatment plant, adsorption test of Korean activated carbon was performed with phenol, ONP, MNP and PNP. Through this experiment adsorption equilibrium relation was correlated by Freundlich equation and its n values were ranged from 4.0 to 6.8. Also the intraparticle diffusion coefficients were determined from adsorption rate measurement in a stirred tank. The effective diffusion coefficients of phenol and three nitrophenol isomer were in the range of
at 293 K and the activation energy for diffusion was evaluated as 7.1-8.3 kcal/mol.
Olefin Selectivity in the Conversion of Methanol over Phosphorus Modified HZSM-5 Catalysts
Seo, Gon ; Song, Yo-Soon ; Byun, Dai-Hong ; Ha, Baik-Hyon ;
Korean Chemical Engineering Research, volume 26, issue 6, 1988, Pages 591~591
The conversion reaction of methanol over modified HZSM-5 catalysts having different amount of phosphorus was studied. Formation of olefins was largely enhanced over 5 wt% phosphorus modified catalyst, although the decrease in conversion of methanol was not significant. The selectivity to propylene was increasing with the amount of impregnated phosphorus, while the selectivity to ethylene was decreasing. The increase in the selectivity to propylene could be explained by decrease of strong acid sites and suppression of reequilibration reaction of olefins due to phosphorus modification.
Hydrodynamics in a Cold Mode Circulating Fluidized Bed Simulating the Commercial Scale Combustor
Son, Jae-Ek ; Choi, Jeong-Hoo ; Lee, Chang-Keun ;
Korean Chemical Engineering Research, volume 26, issue 6, 1988, Pages 599~599
The transition velocity between flow regimes and the particle carry-over rate at the freeboard gas exit were measured in a gas-solid circulating fluidized bed which used sand as bed materials at ambient temperature. The onset velocities of the fast fluidization and the dilute transport increased with the increase of the solid circulation rate. The particle carry-over rate at the freeboard gas exit increased with the increase of the gas velocity and the static bed height. Model considerations on the particle carry-over rate were discussed additionally.
An Analysis of Thermal Instability in a Horizontal Porous Layer Heated from Below
Yoon, Do-Young ; Choi, Chang-Kyun ; Yoo, Jae-Soo ;
Korean Chemical Engineering Research, volume 26, issue 6, 1988, Pages 607~607
When an initially quiescent, fluid-saturated horizontal porous layer is heated by ramp-heating the bottom side of the layer at constant temporal rate, the critical condition of the onset of natural convection is analyzed by employing the propagation theory. For deep-pool systems the base temperature profile is approximated by using the integral method and a new stability equation is generated through the propagation theory which considers the variations of disturbance with time. For infinite Prandtl-number fluids saturated in a porous layer to satisfy Darcy's law, the critical condition is deduced to have the following relation:
In comparison of the above prediction with the experimental data of Kaviany, it is seen that the initiated convection is amplified to observable magnitude at the time
Reduction Characteristics of Mo and Co Catalysts Supported on Activated Carbon and Alumina
Moon, Sang-Jin ; Jeon, Gyung-Soo ; Ihm, Son-Ki ;
Korean Chemical Engineering Research, volume 26, issue 6, 1988, Pages 617~617
Reduction characteristics of Co or Mo oxide catalysts supported on activated carbon and alumina was studied under hydrogen atmosphere using a flow microbalance reactor. The results of TPR study and reduction kinetics study analyzed by the Elovich mechanism showed that the catalysts supported on the carbon had higher rate of reduction and lower variation of reduction activation energy with the extent of reduction. This suggested that the carbon support had less and more homogeneous interaction with the metal phases. The precursor oxide states examined by XRD and DRS and the reduced states investigated by ethylene hydrogenation and hydrogen chemisorption were in good correlation with the proposed explanation.
Removal of Sulfur Dioxide in a Multi-Stage Agitated Reactor Containing Melamine Fine Particles
Lee, Jea-Keun ; Lee, Ki-Ho ; Hu, Chul-Goo ; Chun, Hai-Soo ;
Korean Chemical Engineering Research, volume 26, issue 6, 1988, Pages 625~625
The sulfur dioxide gas mixture was bubbled and removed through the water solution which contain suspended melamine particles using a multi-stage agitated reactor to increase gas-liquid interfacial area and the dissolution rate of melamine particles. In gas-liquid-melamine fine particle system, it was found that the melamine fine particles was continuously dissolved and was used in
absorption reaction was continued until the free melamine particles was completely consumed. The experiment also showed that the melamine sulfate produced from the reaction was easily regenerated by the thermal decomposition. And the
absorption capacities of the melamine regenerated by the thermal decomposition was similar to those of fresh melamine. The amount of
removed per one mole of melamine decreased as the temperature of solution raised and the slurry concentration of solution increased. The
removal efficiency increased with agitation speed, pH of solution, slurry concentration of solution and liquid-gas flow ratio, however, decreased with the temperature of solution.
The Effect of Iodide Ion Addition in Electrochromic Display Device Using Tungsten Oxide Thin Film
Choi, Yoon ; Cho, Won-Il ; Cho, Byung-Won ; Yun, Kyung-Suk ;
Korean Chemical Engineering Research, volume 26, issue 6, 1988, Pages 633~633
The characteristics of response time, memory time, stability, coloration and bleach of electrochromic display device using
thin film were studied. The structure of
layer deposited by rf-sputtering was identified as amorphous one. The coloration and stability were dependent on the
film thickness and showed the best performance in color and stability at
. The addition of iodide ion into gel electrolyte interrupted the oxygen evolution reaction on counter electrode and was able to enhance the response rate and stability of ECD cell. In case of
coated counter electrode, the hydrogen evolution reaction was interrupted by tungsten bronze formation in bleaching step and the life time and stability of ECD cell were improved.
Total Oxidation of Propylene over Perovskite-type Oxide Catalysts
Tak, Yong-Seok ; Lee, Gun-Dae ; Lee, Wha-Young ; Lee, Ho-In ;
Korean Chemical Engineering Research, volume 26, issue 6, 1988, Pages 641~641
) were prepared and used for the complete oxidation of propylene which is one of hydrocarbons in the automobile exhaust gas. Perovskite catalysts were prepared at different calcination temperatures, and the lower calcination temperature gave the higher activity and surface area of the catalyst. In the case of
, substitution of proper amount of Sr into A-site enhanced the activity, and Co showed higher activity than Mn for B-site. The results were explained with the reducibility of the catalysts. The catalysts doped with the trace amount of Pt showed higher activity and better resistance to sulfur poisoning by
than those without Pt. The reaction orders were determined, and the orders with respect to propylene and oxygen were increased and decreased with the increase of reaction temperature, respectively.
The Synthesis of Pyridine from Tetrahydrofurfuryl Alcohol over Supported Pd Catalysts
Choi, Joo-Hong ; Lee, Wha-Young ; Sung, Byuck-Pa-Jung ;
Korean Chemical Engineering Research, volume 26, issue 6, 1988, Pages 649~649
The characteristics of supported palladium catalysts was investigated for the synthesis of pyridine from the reaction of tetrahydrofurfuryl alcohol and ammonia. The effects of support, supported amount of palladium, and palladium precursor on the reaction were discussed in this experiment. The core-level binding energy of
in XPS was shifted higher than that of the unsupported palladium. From this and the reaction of pyridine formation over the catalyst we suggest that there exist interaction between palladium and
. It was also interpreted that the above reaction was strongly related to the acidity of the support, and pyridine was formed on Pd surface modified by its support.
Process Analysis of Perfusion System for Mass Cultivation of Animal Cells
Lee, Hyeon-Yong ; Lee, Jin-Ha ;
Korean Chemical Engineering Research, volume 26, issue 6, 1988, Pages 659~659
A mathematical model of Perfusion Chemostat(PC) system is developed by using continuous feedback processes, where dilution rate is no longer equal to specific growth rate. It is found that specific growth rate is strongly related with dilution rate. Mammalian cell density in the bioreactior can indirectly be predicted and estimated by employing growth model as a function of dilution rate. The maximum specific growth rate is 0.019(1/h) at 0.020(1/h) of dilution rate. The recycle ratio,
and concentration factor, f are estimated as 0.01 and 90.21, respectively. These values are proved to be important parameters in controlling PC system to effectively cultivate large quantities of mammalian cells and produce pharmaceutically active proteins.
Catalysis of 12-Molybdophosphoric Acid Cupric Salt Catalyst on Methanol Partial Oxidation
Kim, Jae-Seung ; Park, Nam-Cook ; Seo, Seong-Gyu ;
Korean Chemical Engineering Research, volume 26, issue 6, 1988, Pages 664~664
catalyst with various copper content(X) and
catalyst supported on
were characterized by methanol oxidation, pretreatment, TPR, and XRD. When the catalyst was pretreated with
, the characteristic keggin structure was partially decomposed with the strength of the reducing power of pretreatment gases, and the decomposed main product was
, respectively. The oxidation activity of catalyst and the selectivity of formaldehyde increased with increasing the content of
catalyst. The optimum content of
was 10 wt%; and the supported catalyst was highly dispersed as a X-ray amorphous state. The supported catalyst did not show Hedvall effect and hysteresis. Its catalytic activity and the thermal stability were greatly enhanced than those of