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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 15, Issue 6 - Dec 1977
Volume 15, Issue 5 - Oct 1977
Volume 15, Issue 4 - Aug 1977
Volume 15, Issue 3 - Jun 1977
Volume 15, Issue 2 - Apr 1977
Volume 15, Issue 1 - Feb 1977
Selecting the target year
Comparison of Model for the Reaction of Solid Partlles
Park, Jin-Yong ;
Korean Chemical Engineering Research, volume 15, issue 1, 1977, Pages 3~3
Numerous models have been proposed to account for gas-solid reactions where conversion does not occur at a sharp moving front and where the simple shrinking core model is not applicable. Here we compare the simplest representations of the two broad classes of such models : the grainy porous pellet model of Szekely and coworkers for the reaction of porous particles, and the crackling core model of Park and Levenspiel for the reaction of dense particles. The phenomenological view, the conversion-time behavior and the size dependency are markedly different for these two models. Experimental methods for evaluating the parameters of these models and for choosing the right one for the system at hand are discussed.
Viscosity of Concentrated Suspensions -Bimodal Simple Cubic Model-
Lee, Chai-Uk ; Suh, Moon-Ho ; Lee, Ki-Jun ;
Korean Chemical Engineering Research, volume 15, issue 1, 1977, Pages 15~15
The bimodal system of simple cubic particle configuration was studied as an extension of the earlier works. In this model two different size rigid spheres were arranged alternatively. The diameter ratio of the two particles ranged from 0.05 to 1.0 and the total particle concentration by volume ranged from 52.4 to 79.2 per cent. It was theoretically shown that the relative viscosity of the model system decreased, in comparison to the unimodal system, as the particle size ratio decreased at a given concentration, whereas the change relative viscosity wad insignificant below the limiting size ratio of about one tenth and the viscosity of the bimodal system was almost equivalent to that of the unimodal system above the size ratio of about eight tenth. These facts were in good agreement with the experimental data reported in the literature.
Calculation of SCOT Column HETP Values by Means of Moments
Foglesong, Robert H. ;
Korean Chemical Engineering Research, volume 15, issue 1, 1977, Pages 23~23
The Laplace domain solution of three coupled partial differential equations descriptive of the mass transfer phenomena that occur within a Support Coated Open Tubular (SCOT) Column is used to derive an expression for the Height Equivalent to a Theoretical Plate (HETP) for any SCOT Column. The final correlation is developed by calculating the theoretical second moment about the mean for a chromatogram and using this result in traditional chromatographic theory to construct the desired expression. Typical experimental values and those calculated from the correlation derived in this work are presented as a verification of the proposed dispersion model employed to describe the mass transfer phenomena within this dynamic system.
Excess Thermodynamic Properties for the Acetone-Water System
Rhim, Jin-Nam ; Kim, Ki-Chang ;
Korean Chemical Engineering Research, volume 15, issue 1, 1977, Pages 33~33
Heats of mixing were measured for the acetone-water system at 15, 25, 35 and
, respectively. Interaction energies between the water and acetone molecules were calculated by the NRTL equation, and the effects of the interaction energy on heats of mixing were discussed. The excess Gibbs free energy and the excess entropy were calculated from the experimental data for the heat of mixing and isothermal vapor-liquid equilibria were predicted from the calculated values of excess Gibbs free energy. The results turned out to be in good agreement with literature values.
Asymptotic Solution and Effective Dispersion Coefficient for a Fixed-bed Adsorption System
Nam, Yeong-Woo ; Rhee, Hyun-Ku ;
Korean Chemical Engineering Research, volume 15, issue 1, 1977, Pages 41~41
It is well understood that under certain circumstances there exists an asymptotic solution for the adsorbate concentration profile in a fixed-bed adsorption system. The present study gives an analytical form of the asymptotic solution for an adsorption system subject to the isotherm of Freundlich type. It is also noticed that the adsorption zone thickness is directly proportional to the effective axial dispersion coefficient. This enables us to propose a scheme, the so-called asymptotic solution technique, to determine the effective axial dispersion coefficient. Breakthrough curves are measured for the acetic acid-water-charcoal system and comparison of those obtained from beds of different height demonstrates the applicability of the asymptotic solution. The experimental profile of the adsorbate concentration is then used to determine the adsorption zone thickness, from which the effective axial dispersion coefficient is computed. The dispersion coefficients determined in this manner turn out to be in good agreement with literature values. Consequently, the asymptotic solution technique may be used as a convenient method for measuring the effective axial dispersion coefficient.
Particle Size of Suspension Polymerized Polystyrene Beads
Kim, Hark-Ryeung ; Kim, Hoa-Gy ;
Korean Chemical Engineering Research, volume 15, issue 1, 1977, Pages 51~51
The effects of the stirring rate and the stabilizer concentration on the particle size of the suspension polymerized polystyrene were experimentally investigated. The reaction was carried out in an unbaffled mixing vessel with benzoyl peroxide as the initiator and polyvinyl alcohol as the stabilizer. The measurement of the product particle size by standard sieves showed that : (1) The average particle size decreased with the increase in stirring rate according to the following relationship, log d=-0.00070 (ND)+0.97 and (2) The propeller type impeller produced the products with broader size distributions than the turbine type impeller of the same dimension.
Plan for Hydrocarbon Underground Storage in Korea
Yu, Hyeong-Deok ;
Korean Chemical Engineering Research, volume 15, issue 1, 1977, Pages 61~61
The underground storage of hydrocarbons is the most economical engineering method known to store a large volume of hydrocarbons and has been widely practiced else where in the world. Because of the recovery difficulties, however, this storage technique is confined to light hydrocarbons. Usually, depleted oil and gas reservoirs are converted to underground gas storages where the underline aquifer behavior controls the storage volume and the pressure. Actual case study examples are described in this paper together with the engineering design and model analysis. Because of the growing Korea's need for bulk volume gas storage, development plans are necessary to apply some of these techniques to Korea. Three different underground storage possibilities are proposed. The utilization of dry holes resulted from petroleum exploration work is a possibility for gas storage if an impermeable rock structure extends over an aquifer. Alternatively, the low temperature geothermal well could similarly be converted to a small gas storage under same assumptions, after a successful energy recovery operation for a moderate economic gain. Lastly, the Jejudo Manjanggool natural cave is a good prospect for a constant volume LPG storage. Because of the many uncertainties and engineering difficulties, sufficient development work must be carried out before attempting to put these into actual practices.
New Programs to be Launched at KAIS
Kim, Young-Gul ;
Korean Chemical Engineering Research, volume 15, issue 1, 1977, Pages 71~71