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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 2, Issue 2 - Dec 1964
Volume 2, Issue 1 - Jun 1964
Selecting the target year
The Effect of the Extraction Rate During Drop Formation
Kim, Beung-Wook ; Kim, Jee-Dong ;
Korean Chemical Engineering Research, volume 2, issue 2, 1964, Pages 67~67
The extraction rate during the formation of drops in the system of toluene-propinic acid-water and benzene-acetic acid-water has been studied and the results for each system were given. It has been considered that the resistance in the continuous phase to solute transfer and the end effect are negligible, and that "the liquid-liquid extraction during drop formation" is not caused by molecular diffusion but by turbulent diffusion.
The Separation of Cerium from Other Rare Earths
Cho, Chong-Ung ;
Korean Chemical Engineering Research, volume 2, issue 2, 1964, Pages 70~70
The separation of cerium from other rare earths in the hydrochloric acid solution was studied. For two methods chosen for industrial applications, the procedures were simple and cerium of high purity was easily obtained. (I) Fractional precipitation as phosphates: Cerium oxidized by potassium permanganate was fractionally separated as insoluble ceric phosphate by pre-added sodium phosphate. The optimum concentration of the free hydrochloric acid was 3%, and the yield of this case was 97%. (II) Fractional precipitation by hypo-chlorite. Cerium was oxidized by sodium hypo-chlorite and fractionally precipitated. By adjusting the pH of the solution at 5.6, cerium was completely separated. The crude cerium precipitate was purified to high purity by nitric acid leaching.
Pelletized Roasting of Molybdenum Sulfides
Lee, Ki-Jun ; Park, Won-Hee ; Choe, Gyu-Won ;
Korean Chemical Engineering Research, volume 2, issue 2, 1964, Pages 74~74
The roasting of molybdenum sulfide cake, a by-product at the chemical processing plant of tungsten ore in Sangdong, Korea, and its optimum operational conditions have been studied. Molybdenum sufide cake was pelletized cylindrically to be packed in the bed, and roasted with the air heated by propane directly. The roasting reaction itself was observed to be extremely rapid and exothermic. The effects of the air rate and inlet air temperature were investigated and the optimum operational conditions were determined. The packed bed height and pellet size also affect the reaction rate remarkably. As the parameter of overall reaction rate, the overall heat liberated rate was calculated from the experimental data and compared with overall weight decrease rate obtained graphically from the thermal balance roasting data. It was found that the molybdenum sulfide cake can be processed economically by the proposed roasting method at the evaluated optimum air rate and inlet air temperature to produce the product containing more than 90%
and less than 2% S which is considered to be rather adequate for the next process of purifying by the method of sublimation.
Measurement of Heat Transfer Coefficient in Fluidized Bed
Namkoong, Shik ; Yoo, Kyong-Ok ;
Korean Chemical Engineering Research, volume 2, issue 2, 1964, Pages 82~82
As a part of study of heat transfer mechanism of fluidized beds, heat transfer coefficients were measured in the bubble bed, the gas-liquid-solid and the gas-solid fluidized beds. The fluidizing gas was air at room temperature, and the liquid was water. The solid was a silica, 0.006 mm in diameter. Superficial velocities of air based on the cross sectional areas of column were
. Heat transfer element was copper tube, 10 mm in diameter and 10 mm in length, with nichrome heater inside. The results were in fair agreement with the previous data. But, in the gas-liquid-solid fluidized bed, when silica was
in weight, heat transfer coefficients scatteredconsiderablly. Particularly, in the gas-solid fluidized bed, the relation between the heat transfer coefficients and the rate of mixing gave a straight line on the log-log plot.
The Rate of Solids Mixing in Gas-Solid Fluidized Bed
Namkoon, Shik ; Chung, Woo-Chang ;
Korean Chemical Engineering Research, volume 2, issue 2, 1964, Pages 87~87
In this work, author tried to determine the rate of lateral solid mixing in gas-solid fluidized bed, using sodium chloride particles as a tracer. The rate of solid mixing of different particle diameters (
) has been observed to depend upon gas velocity, and the empirical correlation has been found as follow: W=a exp(bu), a, b=const. Based on the rate of mixing determined in small scale apparatus, author proposed one of convenient scale-up procedure considered to be very important in the design of industrial scale plant.
Determination of Catalytic Activity for Silica-Alumina System by Microcatalytic Reactor
Namkoong, Shik ; Ha, Baik-Hyon ;
Korean Chemical Engineering Research, volume 2, issue 2, 1964, Pages 94~94
Catalytic activity of
15% was determined by the disproportionation reaction of toluene, and the results were compared with those obtained by Mamoru, who used
25% as the catalyst. Under the conditions such as reaction temperature,;
, particle size of the catalyst,;
mesh, which were some what different from those used by Mamoru, it was found that the rate of disproportionationreaction of toluene was about five times as rapid as Mamoru had found. Helium being used as the carrier gas, activation energies measured were 17.3 [kcal/mole] and 22.0 [kcal/mole] for toluene and xylene, respectively. The values of adsorption energies measured at
were 9.42 [kcal/mole], 10.4 [kcal/mole] and 9.08 [kcal/mole] for benzene, toluene and xylene respectively. Catalyst which was treated with sodium carbonate was discussed to Maxted theory for catalyst poisoning.
On the Filter-aids of Ultra Filter
Kim, Soon-Hyuk ; Ohk, Jung-Kwun ;
Korean Chemical Engineering Research, volume 2, issue 2, 1964, Pages 100~100
The purpose of this experiment is to determine the optimum conditions for precoating and to study the physical properties by increasing the thickness of the precoat. The filtering abilities of Diatomite filter-aid and Koralin A were tested by filtering the liquid containing E. coli 0111. The Ultra Filter, belonging to leaf type, made by the Miura Chemical Machinery Co. in Japan, was used in this experiment. The filter-aids used were Koralin A, Diatomite filter-aid, Hyflo super cel and Standard super cel. Some results obtained were as follows: (1) Precoating data of various filter-aids (2) When Diatomite Filter-aid was used, the shape of the particles was broken at the pressure of
in the precoating test. (3) In the case of E. coli 0111 filtration, Koralin A was compared with Diatomite filter-aid, and Korolin A was found to be better than Diatomite as the filter aid, but in the former the flow rate was lower.
Tracer Studies on Mixing Characteristics of Urea Reactor of Chungju Fertilizer Plant
Kang, Woong-Ki ; Lee, Ik-Choon ;
Korean Chemical Engineering Research, volume 2, issue 2, 1964, Pages 106~106
The mixing characteristics of the urea reactor of Chungju Fertilizer Plant was studied by the instant injection of
radioactive tracer at the feed and analyzing the radioactivity at the outlet. The experimental results were compared with that of theoretical models and the results were agreed well with the model of 90% complete mixing succeeded by 10 % plug flow with diffusion and 30% recirculation. The average residence time obtained is 33.0 minutes. The rates of reactions,
to carbamate and carbamate to urea, were compared by analyzing the radioactivities of carbamate and urea, separately. The reaction time obtained by this method agrees well with the previous study.
A Study on Eddy Diffusion in a Batch Pulse Column
Kim, Chul ; Kang, Woong-Ki ;
Korean Chemical Engineering Research, volume 2, issue 2, 1964, Pages 112~112
The effect of the pulse factors on the longitudinal mixing in a batch pulse column, where the spherical balls are consecutively arrayed along the longitudinal axis, has been studied by a concentration impulse method, both theoretically and experimentally.
was used as a tracer and the concentration was measured by measuring the redioactivity. Fick's second law was applied for the longitudinal mixing of the system and verified by the experiment. The eddy diffusivity was calculated by measuring the slope of the concentration-time-impulse response curve in a particular concentration range. The results of the present investigation shows that the eddy diffusivity is proportional to the frequency and to 4.2 th power of the amplitude, thus giving a conclusion that the longitudinal mixing is much more affected by the amplitude than the frequency.
기술사 제도에 관하여 -기술사법의 특이성을 중심으로-
Jeon, Sang-Geun ;
Korean Chemical Engineering Research, volume 2, issue 2, 1964, Pages 118~118
Seong, Jwa-Gyeong ;
Korean Chemical Engineering Research, volume 2, issue 2, 1964, Pages 124~124
Unifining-Platforming의 특징에 관하여
Han, Geon-U ;
Korean Chemical Engineering Research, volume 2, issue 2, 1964, Pages 131~131
Ji, Eung-Eop ;
Korean Chemical Engineering Research, volume 2, issue 2, 1964, Pages 138~138
Korean Chemical Engineering Research, volume 2, issue 2, 1964, Pages 142~142