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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 8, Issue 4 - Dec 1970
Volume 8, Issue 3 - Sep 1970
Volume 8, Issue 2 - Jun 1970
Volume 8, Issue 1 - Mar 1970
Selecting the target year
표면장력이 증류탑 효율에 주는 영향에 관하여
Lee, Yun-Yong ;
Korean Chemical Engineering Research, volume 8, issue 2, 1970, Pages 44~44
Liquid-Phase Oxidation Mechanism of Cumene
Lee, Chai-Sung ; Lee, Wha-Young ;
Korean Chemical Engineering Research, volume 8, issue 2, 1970, Pages 50~50
The oxidation of pure liquid-phase cumene by oxygen under the atmospheric pressure was studied at temperatures 90, 100 and 110 degrees Centigrade in absence of catalyst. The chain reaction mechanism for the early stage of the reaction, where the cumene concentration stays essentially constant, was conformed with the previous results by Emanuel et al. In this work the range of the cumene concentration was extended until up to 30 % of cumene initially charged was converted. A rigorous kinetic formula was derived, and was tested to this wider range of the concentration change. It was concluded that the formations of
radicals from cumene hydroperoxide was the only necessary step for giving rise to acetophenone if there were produced any within the conditions tested. The rather insignificant of
phenyl carbinol was found due to the reaction between
radicals and cumene molecules in the early stage of the reaction, and the reaction among
radicals themselves in the later stage of the reaction. In any case, the formation of these and other products was found trivial, and cumene hydroperoxide seemed to be the sole important product in this type of a reaction.
An Analysis of Flow of Polymer Melts in a Screw Extruder
Han, Chang-Dae ;
Korean Chemical Engineering Research, volume 8, issue 2, 1970, Pages 58~58
Flow of polymer melts in a screw extruder is analyzed using a viscoelastic model of a modified second-order fluid. The equations of motion are solved numerically by modifying the computational procedure advanced by Fredrickson, and the calculated extruder throughputs at various operating conditions are found to be in reasonable agreement with the experimentally observed values. Furthermore, the computational algorithm developed in the present study provides the profiles of shear rates and melt viscosity in the screw channel.
The Determination of Wetted Area of Packing Materials
Choi, Ung ; Kim, Jong-Sick ;
Korean Chemical Engineering Research, volume 8, issue 2, 1970, Pages 67~67
The present work was undertaken for the purpose of observing wetted area of packing materials in the packed columns. Studies were made on two kinds of Raschig rings by using a dyestuff. The schematic diagram of experimental apparatus is shown in Fig. 1-A and the specifications of Raschig rings are listed in Table 1. The gas rate and viscosity of the liquid has no significant on wetted area. The effects of liquid rate and surface tension of the liquid used are as follows :
k'=0.824 m=-0.96 for 17-mm rings k'=0.368 m=-0.65 for 27-mm rings The values of
varied with the packing height to the -0.05 power for all packing materials.
Reduction of Iron Ore by the Fluidized-Mixed Bed
Rhim, Chin-Nam ; Yoo, Kyong-Ok ;
Korean Chemical Engineering Research, volume 8, issue 2, 1970, Pages 72~72
The mechanism of the iron ore with the anthracite in the fluidized-mixed bed was studied. The experimental data were compared with the theoretical equation based on the steps, such as the diffusion through the gaseous film around the ore particles, the intraparticle diffusion, and the surface chemical reaction. The reaction of reduction with the solid carbon and the carbon monoxide were simultaneously occured in the fluidized-mixed bed and the latter was predominated. The experimental results of the direct reduction are in good agreement with the McKewan's equation which was deduced from the results of reducing iron ore in hydrogen stream. The cohesion phenomenon which frequently obstructed the industrial manufacturing process of the sponge iron could be interpreted from the effect of the exisence of the ferrous oxide; however, this phenomenon could be prevented by applying the fluidized-mixed bed which was diluted with the packing materials, such as fire-brick and sand.
A Critique on The Activity Test Method of Commercial Steam-Hydrocarbon Reforming Catalysts
NamKoong, Shik ; Kim, Doo-Young ;
Korean Chemical Engineering Research, volume 8, issue 2, 1970, Pages 82~82
The activity test of commercial catalysts of steam-hydrocarbon reforming was carried out under the wide range of working conditions. (
; steam to carbon ratio=1.17) An activity test method has been developed through the parallel-triple-column gas chromatographic technique. The following results were obtained: (1) Hydrocarbons are scarcely found in the outlet gas except methane, and the gas composition could be approximately predicted by assuming the chemical equilibrium at the reaction gas temperature, among
. (2) It is difficult to compare the activity of catalysts by any direct comparisons of kinetic data at the high conversion level of reactants, while a conventional method proposed by Inoue et al is eligible. (3) It was concluded that the activity of commercial catalysts A, B, and C are approximately same. (4) Steam to carbon ratio to prevent the carbon deposit was examined experimentally and theoretically.
Effect of Solvents on the Vapor-Liquid Equilibrium of Methylacetate-Methanol System
Park, Won-Kyoo ; Bae, Hyo-Kwang ; Do, Kap-Soo ;
Korean Chemical Engineering Research, volume 8, issue 2, 1970, Pages 94~94
In order to distill the Methylacetate-Methanol system which has an azeotropic point at
., several extractive solvents such as ethanol, propanol, buthanol and buthylacetate were used. These ternary systems, MeAc-MeOH-Solvents, were distilled and recycled in a Smith-Bonner type apparatus for 30-50 min and then, samples of each outlet were analyzes by gas chromatography. Liquid-vapor equilibrium data for each solvent were measured according to the various concentrations. Propanol as extraction solvent is the best one in a series of these systems, referring to the equilibrium curves, and also to the relationship of relative volatility and solvent concentration. As the latter relationship shows a nearly straight line, it may be concluded that this fact is in a good accordance with Johnson's study for inorganic salt-effect onto an azeotropic binary system shown in Fig.7.
The Seawater Exposure Test of Antifouling Paint in Southern Sea of Korea
Chung, Ki-Hyun ; Kim, Jum-Sik ; Park, Mun-Ki ;
Korean Chemical Engineering Research, volume 8, issue 2, 1970, Pages 99~99
1. This study is mainly carried out southern sea of Korea to determine effect of antifouling agents composed of synthetic organic insecticides. 2. The experimental result shows the fact that toxic agents are selectively effective and organic chlorine and phosphate compounds are effective to Balanus, and Formate derived from dithiocarbamate is also effective to marine animal other than Balanus. 3. Simultaneously the relationship between effect of other organic insecticides and variety in composition of varnishes is also determined.
Studies on the Synthesis of Asbestos from Domestic Ore
Lee, Hui-Cheol ; Jang, In-Yong ; Lee, Jun-Ung ;
Korean Chemical Engineering Research, volume 8, issue 2, 1970, Pages 105~105
The aim of this study is synthesis of Amphibole Hornblende Asbestos from domestic ore (talc) and chemicals. To obtain a long fiber of asbestos, mole ratio of components, melting temperature of reaction mixture, rate of cooling of the melt and quenching temperature were varied and optimized. The resulting mixture was analyzed by X-Ray diffraction before and after treating with various decomposing solutions in an autoclave. From the experiment, the following results were obtained; 1. Amphibole Hornblende Asbestos can be synthesized from domestic ore. 2. Optimum mole ratio is
. 3. Optimum melting temperature is
, optimum cooling rate is
, and optimum quenching temperature is
. 4. Best decomposing solution is 2N-NaOH.