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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 5, Issue 4 - Dec 1967
Volume 5, Issue 3 - Sep 1967
Volume 5, Issue 2 - Jun 1967
Volume 5, Issue 1 - Mar 1967
Selecting the target year
다공판(Perforated Tray)에 관하여
Choe, Ung ;
Korean Chemical Engineering Research, volume 5, issue 4, 1967, Pages 197~197
A Study of Liquid Mixing on Screen Blade Turbine Impeller (I)
Kim, Yong-Eak ; Shin, Kun-Yong ; Kang, Woong-Ki ;
Korean Chemical Engineering Research, volume 5, issue 4, 1967, Pages 201~201
The effect of the screen blade turbine impeller on mixing was investigated by the droplet size measurements. The droplet size was measured by using the photographic method. A dilute solution of sebacyl chloride in carbon tetrachloride was dispersed in water by stirring in a baffled mixing tank. After stirring for a few minutes to achieve dispersion, a small quantity of agueous (70 %) hexamethylene diamine was quickly added to the water phase. Agitation was continued for a short time (less than a minute) and then terminated. Discrete droplets (Nylon 6-10) settled to the bottom. A photograph of a random sample of encapsulated drops was made. Discrete droplets were not formed below 200 r. p. m(impeller rotational speed). The diameter of the droplet formed for the screen blade turbine was less than that for the flat blade turbine. In other words, the mixing effect of the screen blade turbine was superior to that of the flat blade turbine. The droplet size was ranged from 0.3mm to 3.6mm. The minimum droplet diameter was 0.3mm when the impeller rotational speed was 800 r. p. m. In unbaffled tank, the diameter range of droplets was from 0.56mm to 3.60mm for the 6-flat blade turbine and 0.45 mm to 2.50mm to the 6-screen blade turbine. In 4-baffled tank, it was from 0.32 mm to 3.25mm for the 6-flat blade turbine and 0.30mm to 2.45mm for the 6-screen blade turbine. The fine screen blade turbine was similar to the rough screen blade turbine in both the power requirements and the droplet size.
Longitudinal Solid Mixing in a Screen Packed Fluidized Bed
Kim, Yong-Eak ; Lee, Chul-Soo ; Kang, Woong-Ki ;
Korean Chemical Engineering Research, volume 5, issue 4, 1967, Pages 205~205
MIXING in a screen packed fluidized bed was studied using activated glass beads as a tracer. Glass beads of about 0.2 mm were used as bed material. A 5cm Pyrex column was employed and longitudinal diffusivities were obtained. Diffusion model was successfully applied. Corelation given by Kang and Osberg was checked, which agreed well with the present experiment at lower air velocities. At higher air velocities a random walk model was proposed and gave good results.
A Sudy of Liquid Mixing on Screen Blade Turbine Impeller (II)
Kim, Yong-Eak ; Shin, Kun-Yong ; Kang, Woong-Ki ;
Korean Chemical Engineering Research, volume 5, issue 4, 1967, Pages 209~209
The effect of the screen blade turbine impeller on power requirement in stirred mixer was investigated. Power data were measured by the dynanomic method. The range of the impeller rotational speed was from 120rpm to 1,540rpm. In an unbaffled system, power data for the three types (of the impeller) are much the same. In a baffled system, power data for the screen blade turbines are much less than the flat blade turbine.
On the Reaction Kinetics of Barium Ferrite
Whangbo, Han ; Doh, Myung-Ki ;
Korean Chemical Engineering Research, volume 5, issue 4, 1967, Pages 215~215
An analytical equation is derived for the kinetic reaction of Barium Ferrite, considering the particle size distributions of raw materials. The powder of Barium Carbonate have the logarithmic normal distributions. The total degrees of reaction are calculated for the reactions at the temperature T=960, 1,040, 1,120, 1,200, and
with various time and compared with those values, determined by means of vibrating sample magnetometer. Jander equation can be applied to the Barium Ferrite reaction, if the particle diameters of Barium Carbonate are equal. And the activation energy of the reaction (
) is obtained according to Arrhenius equation.
On the Recovery of Bi & Mo from the Froth of Bi-Semi-Concentrate by the Chemical Treatment
Lee, Sang-Lae ;
Korean Chemical Engineering Research, volume 5, issue 4, 1967, Pages 223~223
The flotation product of Bi-Semi-Concentrate containing 15% of Bi（sulfide form） and 40% of Mo(mostly as sulfide) was roasted in a Herreshoff roaster. Under the maximum temperature of
, the concentrate was roasted without sintering phenomena. The charge of 3 ㎏ required 6-8 hrs of roasting. Practically all the molybdenite was converted to
. Roasted ore was treated by the 1.5N-NaOH solution for 3-4 hrs, at
was filtered from the insol. residue contg.
. The ppt. was treated in smelter at
and crude Bi (97% Bi) was produced and then refined by S treatment, zincing, chlorination and aeration. Final Bi metal was 99.99 % pure and over-all recovery of Bi was 90%.
soln. was acidified by HCl to pH 2.5 and in this soln., Mo is pptd., as ammonium-sodium-polymolybdate with
. It was refined with 7%
soln., and calcined to
. The purity of final product was 99.97%
and the recovery of it was 85%.
ESTIMATION OF VISCOSITY I. Polar or Nonpolar Gases and Nonpolar Gas Mixtures at Low Pressures (0.2-5 Atm.)
Hyun, Kun-Su ;
Korean Chemical Engineering Research, volume 5, issue 4, 1967, Pages 229~229
Two estimation methods are recommended for calculating the viscosity of polar or nonpolar gases and nonpolar gas mixtures at low pressures (0.2-5 atm.): (1) the theoretical approach using the Chapmen-Enskog expression, and (2) the empirical approach using the principle of corresponding states. These methods allow one to estimate the low pressure viscosity of gases or gas mixtures at any tempereature if either the value of Lennard-Jones or Stockmayer potential parameters or the critical properties for pure gases or components of gas mixtures are known, Errors less than 2 to 3 percent are to be expected over a temperature range from near the freezing point to reduced temperatures around 10 or higher using the Chapman-Enskog expression. Using the empirical correlations by the principle of corresponding states, the errors are expected to be from 2 to 4 percent. Various methods for estimating the viscosity of gases and gas mixtures at low pressures in the absence of experimental data have been suggested by many investigators and the results up to 1964 were summarized by reid and Sherwood. The most reliable meihods were selected to estimate the viscosity by either theoretical method or corresponding states method.