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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 22, Issue 6 - Dec 1984
Volume 22, Issue 5 - Oct 1984
Volume 22, Issue 4 - Aug 1984
Volume 22, Issue 3 - Jun 1984
Volume 22, Issue 2 - Apr 1984
Volume 22, Issue 1 - Feb 1984
Selecting the target year
A Study on the Permeation of Sulfur Dioxide Gas by Silicone Rubber Hollow Fiber Membrane
Kim, Ju-Bong ; Kim, Dong-Yoon ; Song, Ju-Yeong ;
Korean Chemical Engineering Research, volume 22, issue 5, 1984, Pages 225~225
This work is a study on the permeation of sulfur dioxide gas from nitrogen-sulfur dioxide gas mixture through the silicone rubber hollow fiber membrane. Especially, the object of this study was to compare the experimental data with the theoretical model about the relation between axial pressure loss and the inlet flow rate and on the composition profiles of sulfur dioxide gas in the shell side according to the distance of the hollow fiber under parameter cut change.
Liquid Flow Characteristics in a Continuous Flow Stirred Tank Reactor
Kim, Tae-Ok ; Lee, Min-Hyung ; Kang, Woong-Ki ;
Korean Chemical Engineering Research, volume 22, issue 5, 1984, Pages 235~235
The flow characteristics of liquid in a continous flow stirred tank reactor(CFSTR) with a 6-bladed turbine impeller was investigated. The inlet and the outlet were located at the bottom center and the top edge of the reactor, respectively. For the CFSTR, three flow zones (inlet zone, impeller zone and recirculation zone) were assumed and the theoretical residence time distributions based on the flow patterns were compared with the experimental ones. For the case of the lower inlet flow rate and the lower agitation speed, the experimental results showed that the flow pattern of the inlet zone was considered to be plug flow nature. For the higher inlet flow rate as well as the higher agitation speed, however, the flow pattern of the inlet zone was considered to be perfect mixing zone due to the considerable recirculation flow. The impeller zone has a perfect mixing nature and the magnitude of the perfect mixing zone increased with agitation speed.
Anodic Process of Pinacol Solution at Platinum and Lead Dioxide Anodes(I)
Nam, Chong-Woo ; Sohn, Joo-Hwan ; Park, Seung-Cho ;
Korean Chemical Engineering Research, volume 22, issue 5, 1984, Pages 245~245
Using platinum and lead dioxide electrode, anodic process of pinacol have been investigated with potentiostatic method in various pH. Experimental results indicate that yield of acetone from pinacol is good in acidic region and electrolytic products is pH dependent. In this paper, we studied that Tafel slope for the oxidation of 0.5 M pinacol solution buffered to pH 1.2 in order to investigate the mechanism of C-C bond cleavage reaction of pinacol. Results of Tafel slope indicate that electrochemical oxidation of pinacol is electron-electron (E-E) mechanism.
Hydrodynamics and Coal Combustion Characteristics of Circulating Fluidized Beds
Shin, Byung-Chul ; Koh, Young-Bum ; Kim, Sang-Done ;
Korean Chemical Engineering Research, volume 22, issue 5, 1984, Pages 253~253
In a circulating fluidized bed
, flow regimes of coal-air system at room temperature and coal combustion efficiency and temperature profiles along the bed height have been determined. An anthracite domestic coal having heating value of 4,870 Kcal/Kg was employed. Coal particle sizes were varied 0.205, 0.395 and 0.71 mm for flow regime and 0.71 mm for coal combustion studies. The transition velocity between bubbling and turbulent beds and the transport velocity between turbulent and fast beds have been determined. In a circulating fluidized bed, combustion efficiency was higher in the turbulent bed than that in the bubbling bed. Steady combustion operation can be easily maintained at much lower temperature in the turbulent bed than in the bubbling bed.
Rheological Properties of Coal- Oil Mixture
Cho, Soon-Haeng ; Shin, Dae-Hyun ; Kim, Dong-Chan ;
Korean Chemical Engineering Research, volume 22, issue 5, 1984, Pages 259~259
Rheological properties of coal-oil mixture(COM) was studied. The viscosity of COM was measured by changing the coal concentration, temperature, water content, and stabilizing agent. Non-Newtonian Properties of 40 Wt% and 45 Wt% coal COM was investigated by varing the water concentration at
. The viscosity variance vs temperature was well fitted with the equation
, and the viscosity corresponding to the volume concentration of coal was also well fitted with the Thomas relation. The COM including water showed non-Newtonian characteristics of pseudoplastic model.
Drop Formation and Size Distribution in a Stirred Vessel
Park, Bang-Sam ; Lee, Jun-Ung ; Yu, Seung-Gon ; Lee, Bo-Seong ;
Korean Chemical Engineering Research, volume 22, issue 5, 1984, Pages 267~267
A fiberscope and highspeed camera system was employed to measure drop size distribution in a stirred vessel. Two geometrically similar vessels, two types of impellers were used for the experiment. Three systems were chosen for a variation of physical properties. With the measured size spectra, bimodality analysis technique was introduced to predict the coalescence ratio. Sauter mean diameter was correlated with operating variables and physical properties.
Estimation of Mass Transfer Parameters in a Fixed Bed of Bi-dispersed Polymer Resin by Moment Method
Park, In-Soo ; Suh, Gil-Duk ;
Korean Chemical Engineering Research, volume 22, issue 5, 1984, Pages 279~279
In order to estimate mass transfer parameters of a gas in a fixed bed of solid with bi-dispersed pore structure, we derived new moment equations. The model contains the surface diffusion process on the surface of macropore. With the model mass transfer parameters of
in the fixed bed of bi-dispersed polymer resin, XAD-2, was estimated satisfactory. Macropore tortuosity factor was 2.40, which was obtained by moment analysis of nearly nonadsoring gas, Ar. Heat of adsorption was -4.2 kcal/mol.Micropore diffusivity,
and the activation energy was 7.3 kcal/mol. And macropore surface diffusivity was
and the activation energy was 2.7 kcal/mol.
Effect of Mordenite Modification on Liquid Phase Isomerization of Xylene
Kim, Sung-Ho ; Lee, Wha-Young ;
Korean Chemical Engineering Research, volume 22, issue 5, 1984, Pages 289~289
Modified H-mordenites were prepared and subjected to Xylene isomerization reaction to gain insight into surface chemistry of zeolite catalysis. Modification steps include ion-exchange with transition metal, steam treatment at
, and dealumination with boiling hydrochloric acid. The activity and shape selectivity of those variously treated mordenites on the liquid phase isomerization of xylene were compared with those of the untreated mordenites. The experiments were carried out under the condition of 5.8g-xylene/(hr) (g-cat) at
and 30 atm. Mordenites ion-exchanged with Co, Ni, and Fe salts as well as treated with steam at high temperature showed considerable reduction of deactivation. On the contrary the dealuminated mordenites are not effective for the selective isomerization of xylene and rather increase the disproportionation of xylene.